含鈦鋁之鈷基超合金在不同溫度及應變速率下的動態塑變行為與顯微結構分析

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行政院國家科學委員會專題研究計畫成果報告

含鈦鋁之鈷基超合金在不同溫度及應變速率下的動態塑變

行為與顯微結構分析

研究成果報告(精簡版)

計畫類別：個別型計畫編號： NSC 100-2218-E-151-001- 執行期間： 100 年 08 月 01 日至 101 年 07 月 31 日執行單位：國立高雄應用科技大學機械工程系計畫主持人：陳道星計畫參與人員：碩士班研究生-兼任助理人員：蔡智凱碩士班研究生-兼任助理人員：賴祉妤公開資訊：本計畫涉及專利或其他智慧財產權，1 年後可公開查詢

中華民國 101 年 09 月 01 日

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中文摘要：本計畫主要是探討鈷基超合金在不同鈦與鋁的含量下之塑性變形特性與微觀結構，並探討合金元素鈦與鋁之添加與應力、應變、應變速率與測試溫度之變化對鈷基超合之機械性質的影響。計畫期間為一年主要在開發之鈦與鋁元素的添加製備出兩種不同含鈦與鋁含量之鈷基超合金與一種完全不含鈦與鋁之鈷基超合金，經萬能材料試驗機（MTS）進行靜態壓縮測試( =10-3, 10-2, 10-1s-1, T= 700℃, 500℃,及 25℃)及微觀組織觀測，來描述不同鈦與鋁含量之鈷基超合金在不同溫度及應變速率下之塑變行為。所有之研究成果將可作為具耐高溫性質之不同鈦及鋁含量之鈷基超合金之研製及其在高速成型加工與結構元件設計應用之參考。中文關鍵詞：鈷基超合金、應變速率效應、溫度效應、差排，鈦與鋁。英文摘要： The effect of titanium and aluminum contents, strain,

strain rate and tested temperatures on the mechanical properties and microstructural properties will be investigated in this study. These cobalt base super alloys are to be tested using material testing system (MTS) at strain rates of 10-3, 10-2 and 10-1s-1 and at temperatures of 700℃, 500℃ and 25℃

respectively. It is found that the flow stress increases with increasing strain rate and Ti and Al contents, but decreases with increasing temperature. Furthermore, the strain rate sensitivity increases with increasing strain rate, but decreases with increasing temperature. The microstructural

observations confirm that the mechanical response of the cobalt superalloy specimens is directly related to the effects of the titanium and aluminum contents, strain rate and temperature on the evolution of the microstructure. It can be observed that the

strengthening effect in cobalt suprealloy is a result primarily of dislocation multiplication. The

dislocation density increases with increasing strain rate, but decreases with increasing temperature. 英文關鍵詞： co-base superalloy, strain rate, precipitate, thermal

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行政院國家科學委員會補助專題研究計畫成果報告

含鈦鋁之鈷基超合金在不同溫度及應變速率下的動態塑變行為

與顯微結構分析

計畫類別：



個別型計畫 □ 整合型計畫

計畫編號：NSC －100－2218－E－151－001

執行期間：100 年 08 月 01 日至 101 年 07 月 31 日

計畫主持人：陳道星

共同主持人：

計畫參與人員：蔡智凱（碩士生）

、賴祉妤（碩士生）

成果報告類型(依經費核定清單規定繳交)：



精簡報告 □完整報告

本成果報告包括以下應繳交之附件：

□赴國外出差或研習心得報告一份

□赴大陸地區出差或研習心得報告一份

□出席國際學術會議心得報告及發表之論文各一份

□國際合作研究計畫國外研究報告書一份

處理方式：除產學合作研究計畫、提升產業技術及人才培育研究計畫、列管計

畫及下列情形者外，得立即公開查詢

□涉及專利或其他智慧財產權，



一年□二年後可公開查詢

執行單位：

國立高雄應用科技大學機械工程系

中華民國 101 年 8 月 31 日

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含鈦鋁之鈷基超合金在不同溫度及應變速率下的動態

塑變行為與顯微結構分析

The dynamic plastic deformation behaviour and microstructure evolution

of cobalt base superalloy with different Ti and Al under various

temperatures and strain rates

計畫編號： NSC 100-2218-E-151-001

執行期限： 100年8月1日至101年7月31日

主持人：陳道星國立高雄應用科技大學機械工程系助理教授

1. 中文摘要 本計畫主要是探討鈷基超合金在不同鈦與鋁的含量下之塑性變形特性與微觀結構，並探討合金元素鈦與鋁之添加與應力、應變、應變速率與測試溫度之變化對鈷基超合之機械性質的影響。計畫期間為一年主要在開發之鈦與鋁元素的添加製備出兩種不同含鈦與鋁含量之鈷基超合金與一種完全不含鈦與鋁之鈷基超合金，經萬能材料試驗機（MTS）進行靜態壓縮測試 ( =10-3, 10-2, 10-1s-1, T= 700o , 500o ,及 25o )及微觀組織觀測，來描述不同鈦與鋁含量之鈷基超合金在不同溫度及應變速率下之塑變行為。所有之研究成果將可作為具耐高溫性質之不同鈦及鋁含量之鈷基超合金之研製及其在高速成型加工與結構元件設計應用之參考。  C C C 關鍵詞：鈷基超合金、應變速率效應、溫度效應、差排，鈦與鋁。 Abstract

The effect of titanium and aluminum contents, strain, strain rate and tested

temperatures on the mechanical properties and microstructural properties will be investigated in this study. These cobalt base super alloys are to be tested using material testing system (MTS) at strain rates of 10-3, 10-2 and 10-1s-1 and at temperatures of 700 ℃, 500℃ and 25℃ respectively. It is found that the flow stress increases with increasing strain rate and Ti and Al contents, but decreases with increasing temperature. Furthermore, the strain rate sensitivity increases with increasing strain rate, but decreases with increasing temperature. The microstructural observations confirm that the mechanical response of the cobalt superalloy specimens is directly related to the effects of the titanium and aluminum contents, strain rate and temperature on the evolution of the microstructure. It can be observed that the strengthening effect in cobalt suprealloy is a result primarily of dislocation multiplication. The dislocation density increases with increasing strain rate, but decreases with increasing temperature. Keywords: co-base superalloy, strain rate, precipitate, thermal energy, dislocation, Ti and Al addition

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2. Introduction

Cobalt base superalloy is well suitable materials for use in dramatic temperature change and corrosion environments, and is therefore widely used in such applications as the International Space Station, turbine blades, combustor lines in gas turbine engines, and nuclear reactors equipment[1, 2]. The strengthening mechanism of Cobalt base superalloys are mainly by utilizing the carbide precipitates, such as M6C and M23C6,

and solid solution strengthening elements, such as W, Mo, and Ta [3]. However, the high temperature strength and ductility of these Cobalt base superalloys are inferior to those of nickel base superalloys. Recently, the literatures [4] reported that a ternary compound Co3Al,Co3Ta and Co3Tiwith L12

structure was developed. The novel cobalt base superalloys strengthened by high volume fractions of the L12 compound leads

high mechanical properties, superior hot-corrosion and wear resistance compared with nickel base superalloys for the applications in severe environments. In general, the flow stress in engineering materials increases with increasing strain rate, but decreases with increasing temperature. The effects of strain rate or temperature the particular material are important. Previous literatures have shown that the rate of dislocation multiplication and the dislocation structures themselves are highly sensitive not only to the deformation temperature and strain rate, but also to the original crystal structure of the material [5, 6]. In general, the rate of dislocation multiplication increases with increasing

strain rate or reducing temperature and leads to an improved material strength [7]. This study investigates the effects of the addition of titanium and aluminum on the mechanical properties and microstructural evolution of cobalt base superalloy and the flow stress behaviors of the superalloy at different temperatures. The microstructures of the tested specimens are examined using transmission electron microscopy (TEM). The stress-strain relation and the evolution of the microstructure are discussed for each of the considered test conditions

3. Experimental Procedure and

Material Preparation

　 The cobalt base superalloys were prepared in a vacuum arc melted furnace. The mass chemical composition of the cobalt base superalloy (as measured by a glow discharge spectrometer (GDS)) are 17 Cr, 9 Ni, 13 W, 1.2 Mn, 0.04 C, and the balance Co, with different contents of Ti and Al, and it was shown in Table 1. The solution heat treatment of the ingots was carried out at 1300℃ for 2 h in a vacuum furnace. Then they were then aged at 680℃ for 4 h and at 850℃ for 20 h and poured into a heated permanent metal mold. Then an indirect extrusion machine forms bars with dimensions of 13 mm x 700 mm (diameter x length). Finally, these bars were machined into cylindrical specimens with a length and diameter of 9.7 mm and the ends

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of each specimen were then carefully finished using a grinder. Quasi-static tests were carried out using a Material Testing System (MTS) at strain rates of 10-3 s-1, 10-2 s-1 and 10-1 s-1, respectively and temperatures of 25℃, 500 ℃ and 700℃.

After quasi-static testing, the microstructural observations of deformed specimens were examined using a JEOL TEM-3010 transmission electron microscope (TEM) operating at 300kV. The specimens for TEM observation were prepared by cutting foils of 350μm thickness from the deformed specimens. The disks were then punched from each foil, finally ground to a thickness of 200μm, and then twin-jet polished with a solution of Spar etchant (100 ml of distilled water, 100 ml of 32% HCl, 10 ml of 65% HNO3 and 0.3 ml 1-methoxy-2-propanol).

4. Results and Discussions

4-1Mechanical behaviour response

Figure 1(a) shows the true stress-strain curves for cobalt base superalloy which contains 0.9% Ti and 0.9%Al contents deformed at temperature of 25 ℃, 500℃ and 700℃, and strain rates of 10-3 s-1, 10-2 s-1 and 10-1 s-1, respectively. It can be observed that the flow stress of Co-0.9Ti-0.9Al superalloy increase with strain rate and strain, but decrease with

increasing temperature. Furthermore, it is apparent that no fracture occurs in any loading condition. These results indicate that the Co-0.9Ti-0.9Al superalloy has excellent deformability properties under the strain rate range and the temperature conditions. This thermal softening effect is manifested in the stress-strain curves shown in Fig. 1(a) by the differences observed in the flow stress and work-hardening rate under different loading conditions. It also can be seen the similar results at the Co-0.9Ti-0.3Al and Co-0Ti-0Al superalloy, as shown in Fig.1 (b) and 1(c). Figs. 1(a)-1(b) present the higher Al contents of cobalt base superalloy have high flow stress. Furthermore, Figs. 1(a)-1(c) present the cobalt base superalloys contain Ti and Al contents have high flow stress than the cobalt base superalloy without Ti and Al additions. From Figs. 1(a)-1(c), there can be suggested that a lower deformation temperature increases the density and multiplication rate of the dislocations within the cobalt base superalloy microstructure, and prompts a corresponding increase in the plastic flow resistance.

4-2Strain rate effect

The relationship between the strain rate sensitivity of the three cobalt base superalloy and the strain rate can be visualised by plotting the flow stress against

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Since the flow stress of cobalt base superalloy is dependent on the strain rate, the variation of the flow stress with strain rate is dominated by the specific rate-controlling deformation mechanism. If the strain rate is controlled by a thermally activated process with a free energy of activation _G_{, the relationship between}

the flow stress and the strain rate can be described by the Arrhenius type equation, i.e.

the semi-logarithmic strain rate at a constant true strain. Figures 2(a) show that the Co-0.9Ti-0.9Al superalloy for true strains of 0.1 and 0.2, the flow stress increases with increasing strain rates and strain, but decreases with increasing temperature. It also can be seen the similar results at the Co-0.9Ti-0.3Al and Co-0Ti-0Al superalloy as shown in Fig.2 (b) and 2(c), respectively. However, it also reveals that the cobalt base superalloy contains Ti and Al contents has a higher value of flow stress for a similarly strain rate. It is seen that the flow stress of the three cobalt superalloys increase with increasing strain rate. The effect of the strain rate on the stress can be quantified via the strain rate sensitivity parameter β. The strain rate sensitivity, β, of the cobalt superalloy can be calculated from the experimental data presented in Figs. 2(a)-2(c), and the equation as showing in following [8]: 1 2 1 2 ln kT kT   _ _  _  _                

where  is the deformation strain rate, G

 is the activation free energy, k is the Boltzmann constant, T is the absolute temperature, and the activation volume _{ .}*

The activation volume index provides an indication of the evolution of dislocations during a plastic deformation process. Using the relationship presented in Eq. 2, the activation volume, normalized with respect to b3 (where b is the Burger vector of cobalt superalloy, i.e. 2.5×10-10 m), can be presented as a function of the strain, as shown in Figs. 4(a)-4(c), respectively. The results show that the activation volume decreases with increasing strain but increases with increasing temperature at the similar strain. ) / ln( 2 1 1 2         

where the flow stresses₂ and  are ₁ obtained from tests conducted at strain rates of and ,respectively, and are calculated at the same value of plastic strain. Figs. 3(a)-3(c) present the strain rate sensitivity of the cobalt base superalloy as a function of strain. It can be seen that the strain rate sensitivity of the three cobalt base superalloys increases with strain rate, but decreases with increasing temperature. Furthermore, it is also evident that the cobalt base superalloy contains Ti and Al contents have a higher value of β for a similarly deformed temperature and strain rate.

2

 ₁

The results suggest that the thermal activation effect, which assists dislocations

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to overcome obstacles during plastic deformation, reduces as the strain and strain rate are increased. The reduction in the activation volume with increasing strain rate also indicates that the amount of thermal vibration occurring at higher strain rates is less than which occurs in low strain rate testing.

4-4 Microstructural observations and analysis

Figure 5 (a), 5(b) and 5(c) present the optical micrograph of the three as-received cobalt base superalloys. The microstructure graphes comprises equi-axed grains and annealing twins. From the mechanical behaviour analysis, the stress-strain behaviour of the three cobalt base superalloy specimens under different strain rate and temperatures is clarified in terms of the corresponding microstructural evolution. The microstructural evolution due to the influences of strain rate and temperature can be investigated by using TEM technology. There are many literatures reported in different strain rate loading, the dislocation structures are dependent upon the stacking-fault energy and the high stacking-fault materials are deeply influenced by dislocation cells [9-11]. However, the cobalt base superalloys are

high stacking-fault energy material, they are reasonable to expect the microstructures of the deformed specimens to contain cell structures.。

Figure 6(a) presents the TEM micrograph of Co-0.9Ti-0.9Al alloy deformed at a strain rate of 10-3s-1 and at temperature of 25℃. Comparison of the Fig. 6(a) with 6(b) at a constant temperature of 25℃, bur at an increasing strain rate, it presents that with increasing strain rate, the average size of the dislocation cells decreases. However, comparing the micrographs deformed at a constant strain rate (e.g. 10-1 s-1) but at an increasing temperature (Figs. 6(a), 6(c) and 6(d)), it is observed that the dislocations are annihilated as the deformation temperature is increased. It is the similar tendency at Co-0.9Ti-0.3Al and Co-0Ti-0Al alloy which shows in Fig. 7 and Fig. 8. But comparing Fig. 6 and Fig. 7, it presents that the dislocation density of Co-0.9Ti-0.9Al alloy is higher than Co-0.9Ti-0.3Al alloy. A higher dislocation density, which increases the degree of dislocation tangling, reduces the mobility of the dislocation and therefore enhances the resistance of the material to plastic deformation. Furthermore, comparing Fig. 6 and Fig. 7 with Fig. 8, it presents that the dislocation density of cobalt base alloys with Ti and Al additions

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are higher than cobalt base alloys without Ti and Al additions. These observations are also consistent with the strain rate and temperature effect on the Figs. 1(a)-1(c). Furthermore, it is known that cobalt base superalloy contains Ti and Al contents, which can formation the coherent precipitate of Co3(Ti,Al) compound also can enhance

the strength of the cobalt base superalloy

5. CONCLUSIONS

6. References

1. D.L. Klarstrom, J. Mater.Eng. Perform., 2, 523 (1993).

2. V. Kuzucu, M. Ceylan, H. Celik and I. Aksoy, J.Mater. Process. Technol.,74, 137

(1998).

3. C.Tang, F. Pan, X. Qu, B. Duan, T. Wang and X. He, Rare Metals, 27, 292 (2008). 4. A. Suzuki, G.C. DeNolf and T. M. Pollock,

Scr. Mater., 56, 385 (2007)

5. S. Yadav and K. T. Ramesh, Mater. Sci.

Eng. A, 203 140 (1995)

This study has investigated the quasi-static mechanical behaviour and microstructural evolution of three cobalt base superalloys at strain rates ranging from 10-3 s-1 to 10-1 s-1 and temperatures of 25~700 ℃ with and without Ti and Al contents. The results have shown that the flow stress increase with increasing strain rate, but decrease with increasing temperature. Moreover, it has been revealed that under the same deformation condition, the cobalt base superalloy contains Ti and Al contents has high strength than without Ti and Al content. As the deformation temperature increases, the strain rate sensitivity decreases, but the activation volume increases. TEM observations have shown that the dislocation density increases with increasing strain rate, but decreases with increasing temperature. The high dislocation density and small dislocation cell size result in an increased flow stress. Furthermore, the cobalt base superalloy has the Ti and Al contents, which can formation the coherent compound of Co3(Ti,Al) also can enhance the strength of

the cobalt base superalloy.

6. D. E. Albert and G. T. Gray III, Acta

Mater., 45, 343 (1997).

7. H. Jarmakani, J. M. McNaney, B. Kad, D. Orlikowski, J. H. Nguyen and M. A. Meyers,

Mater. Sci. Eng. A, 463, 249 (2007).

8. S. S. Egg, Y. Q. Sue, P. B. Hirsch, Mater.

Sci. Eng. A, 192-193, 45 (1995)

9. M.A. Meyers and L.E. Murr, Editor, Shock Wave and High-Strain Rate Phenomena in Metals: Concept and applications, Chapter 37, Plenum Press, New York, 607 (1981).

10. C.L. Fu, J. Mater. Res., 5, 971 (1990) 11. W. S. Lee, T. H. Chen, Mater. Trans., 47, 355 (2006).

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7. Figures and Table

Table 1 Chemical composition of cobalt base

superalloy. Element (wt.%) Cr Ni W Ti Al Co superalloy—2 17 9 13 0.9 0.9 Balance superalloy—2 17 9 13 0.9 0.3 Balance superalloy—3 17 9 13 0 0 Balance 0 0.1 0.2 0. True Strain 3 0 200 400 600 800 1000 T rue St re ss( MPa) Co-0.9Ti-0.9Al 0.1 s-1 0.01 s-1 0.001 s-1 25 o_C 500 o_C 700 o_C

Fig. 1(a). True stress-strain curves of

Co-0.9Ti-0.9Al alloy deformed at strain rates of 10-1 s-1, 10-2 s-1 and 10-3 s-1 and temperatures of 25℃, 500℃ and 700℃ , respectively. 0 0.1 0.2 0.3 True strain 0 200 400 600 800 1000 T ru e s tre ss (M P a) Co-0.9Ti-0.3Al 0.1 s-1 0.01 s-1 0.001 s-1 25 o_C 500 o_C 700 o_C

Fig. 1(b). True stress-strain curves of

Co-0.9Ti-0.3Al alloy deformed at strain rates of 10-1 s-1, 10-2 s-1 and 10-3 s-1 and temperatures of 25℃, 500℃ and 700℃ , respectively. 0 0.1 0.2 0.3 True Strain 0 200 400 600 800 1000 T rue St re ss( MPa) Co-0Ti-0Al alloy 0.1 s-1 0.01 s-1 0.001 s-1 700 o_C 500 o_C 25 o_C

Fig. 1(c). True stress-strain curves of

Co-0Ti-0Al alloy deformed at strain rates of 10-1 s-1, 10-2 s-1 and 10-3 s-1 and temperatures of 25℃, 500℃ and 700℃ , respectively. strain rate, s-1 400 600 800 1000 Fl ow St re ss,  (M Pa ) 0.1 0.2 10-4 ₁₀-3 ₁₀-2 ₁₀-1 ₁₀0  500 o C 25 o_C 700 o_C

Fig. 2(a). Variation of flow stress with log

strain rate at true strains of 0.1 and 0.2 and temperatures of 25℃, 500℃ and 700℃ for Co-0.9Ti-0.9Al alloy.

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strain rate, s-1 400 500 600 700 800 900 Fl ow St re ss ,  (MP a) 0.1 0.2 10-4 ₁₀-3 ₁₀-2 ₁₀-1 ₁₀0  500 o_C 25 o_C 700 o_C 0 5 10 15 20 25 Str ain r ate s en si tiv ity ,  MP a

Fig. 2(b). Variation of flow stress with log

strain rate at true strains of 0.1 and 0.2 and temperatures of 25℃, 500℃ and 700℃ for Co-0.9Ti-0.3Al alloy.

strain rate, s-1 400 500 600 700 800 900 Fl ow St re ss,  (M Pa ) 0.1 0.2 10-4 10-3 10-2 10-1 100  500 o_C 25 o_C 700 o_C

Fig. 2(c). Variation of flow stress with log

strain rate at true strains of 0.1 and 0.2 and temperatures of 25℃, 500℃ and 700℃ for Co-0Ti-0Al alloy.

0 0.1 0.2 0.3 0. True strain 4 0 5 10 15 20 25 St ra in rate s en si tiv it y,  MP a 10-3_-10-1_s-1 10-3_-10-2_s-1 25 o_C Co-0.9Ti-0.9Al Co-0Ti-0Al Co-0.9Ti-0.3Al

Fig. 3(a). Variation of strain rate

sensitivity as function of strain for three cobalt superalloy at temperature of 25℃

0 0.1 0.2 0.3 0. T 4 500 o_C Co-0.9Ti-0.9Al Co-0Ti-0Al Co-0.9Ti-0.3Al 10-3_-10-1_s-1 10-3_-10-2_s-1 rue strain

Fig. 3(b). Variation of strain rate

sensitivity as function of strain for three cobalt superalloys at temperature of 500℃

0 0.1 0.2 0.3 0.4 True strain 0 5 10 15 20 25 St ra in r ate s ens iti vity ,  MP a 10-3_-10-1_s-1 10-3_-10-2_s-1 700 o_C Co-0.9Ti-0.9Al Co-0Ti-0Al Co-0.9Ti-0.3Al

Fig. 3(c). Variation of strain rate

sensitivity as function of strain for three cobalt superalloys at temperature of 700℃

0 5 10 15 20 25 Ac tiv ati on v ol um e,   b  0 0.1 0.2 0.3 0. T 4 25 o_C Co-0.9Ti-0.9Al Co-0.9Ti-0.3Al Co-0Ti-0Al 10-3_-10-1_s-1 10-3_-10-2_s-1 rue strain

Fig. 4(a). Variation of activation volume

as function of strain for three cobalt superalloy at temperature of 25℃

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0 0.1 0.2 0.3 True strain 0.4 10 15 20 25 30 Ac tiv ati on v ol um e,   b  10-3_-10-1_s-1 10-3_-10-2_s-1 500 o_C Co-0.9Ti-0.9Al Co-0.9Ti-0.3Al Co-0Ti-0Al

Fig. 4(b). Variation of activation volume

as function of strain for three cobalt superalloys at temperature of 500℃ 0 0.1 0.2 0.3 True strain 0.4 0 5 10 15 20 25 30 Ac tiv ati on v ol um e,   b  10-3_-10-1_s-1 10-3_-10-2_s-1 700 o_C Co-0.9Ti-0.9Al Co-0.9Ti-0.3Al Co-0Ti-0Al

Fig. 4(c). Variation of activation volume

as function of strain for three cobalt superalloy at temperature of 700℃

Fig. 5 (a). Micrograph of as-received

Co-0.9Ti-0.9Al alloy; (b) Co-0.9Ti-0.3Al; (c) Co-0Ti-0Al alloy

Fig. 6. TEM micrographs of dislocation

arrangement for Co-0.9Ti-0.9Al alloy deformed at strain rates of: (a) =10-3 s-1 and temperature at 25℃ and (b)



=10-1 s-1 , temperature at 25℃; and =10-1 s-1 at temperature of (c) 500℃; (d) 700℃.



arrangement for Co-0.9Ti-0.3Al alloy deformed at strain rates of: (a) =10-3 s-1 and temperature at 25℃ and (b) =10-1 s-1 , temperature at -25℃; and =10-1 s-1 at temperature of (c) 500℃; (d) 700℃.

  

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arrangement for Co-0Ti-0Al alloy deformed at strain rates of: (a)  =10-3_s-1_and

temperature at 25℃ and (b) =10-1_s-1_, temperature at -25℃; and =10-1_s-1_at temperature of (c) 500℃; (d) 700℃   

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國科會補助計畫衍生研發成果推廣資料表

日期:2012/08/27

國科會補助計畫

計畫名稱: 含鈦鋁之鈷基超合金在不同溫度及應變速率下的動態塑變行為與顯微結構分析計畫主持人: 陳道星計畫編號: 100-2218-E-151-001- 學門領域: 應力應變與成型

無研發成果推廣資料

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100 年度專題研究計畫研究成果彙整表

計畫主持人：陳道星計畫編號： 100-2218-E-151-001-計畫名稱：含鈦鋁之鈷基超合金在不同溫度及應變速率下的動態塑變行為與顯微結構分析量化成果項目實際已達成數（被接受或已發表）預期總達成數(含實際已達成數) 本計畫實際貢獻百分比單位備註（質化說明：如數個計畫共同成果、成果列為該期刊之封面故事 ... 等）期刊論文 2 0 100% 研究報告/技術報告 1 0 100% 研討會論文 2 0 100% 篇論文著作專書 0 0 100% 申請中件數 0 0 100% 專利已獲得件數 0 0 100% 件件數 0 0 100% 件技術移轉權利金 0 0 100% 千元碩士生 2 0 100% 博士生 0 0 100% 博士後研究員 0 0 100% 國內參與計畫人力（本國籍）專任助理 0 0 100% 人次期刊論文 2 0 100% 研究報告/技術報告 0 0 100% 研討會論文 0 0 100% 篇論文著作專書 0 0 100% 章/本申請中件數 0 0 100% 專利已獲得件數 0 0 100% 件件數 0 0 100% 件技術移轉權利金 0 0 100% 千元碩士生 0 0 100% 博士生 0 0 100% 博士後研究員 0 0 100% 國外參與計畫人力（外國籍）專任助理 0 0 100% 人次

(16)

其他成果

(

無法以量化表達之成果如辦理學術活動、獲得獎項、重要國際合作、研究成果國際影響力及其他協助產業技術發展之具體效益事項等，請以文字敘述填列。) 無成果項目量化 名稱或內容性質簡述 測驗工具(含質性與量性) 0 課程/模組 0 電腦及網路系統或工具 0 教材 0 舉辦之活動/競賽 0 研討會/工作坊 0 電子報、網站 0 科教處計畫加填項目計畫成果推廣之參與（閱聽）人數 0

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國科會補助專題研究計畫成果報告自評表

請就研究內容與原計畫相符程度、達成預期目標情況、研究成果之學術或應用價

值（簡要敘述成果所代表之意義、價值、影響或進一步發展之可能性）

、是否適

合在學術期刊發表或申請專利、主要發現或其他有關價值等，作一綜合評估。

1. 請就研究內容與原計畫相符程度、達成預期目標情況作一綜合評估

■達成目標

□未達成目標（請說明，以 100 字為限）

□實驗失敗

□因故實驗中斷

□其他原因

說明：

2. 研究成果在學術期刊發表或申請專利等情形：

論文：■已發表 □未發表之文稿 □撰寫中 □無

專利：□已獲得 □申請中 ■無

技轉：□已技轉 □洽談中 ■無

其他：（以 100 字為限）

3. 請依學術成就、技術創新、社會影響等方面，評估研究成果之學術或應用價

值（簡要敘述成果所代表之意義、價值、影響或進一步發展之可能性）（以

500 字為限）

鈷基超合金具有優異的耐腐蝕性與高溫強度之優良的機械性質，再加上其具有良好的延性與抗衝擊性和可焊接性等，已被廣泛的應用於核能工業、汽車工業、航太領域。由於鈷基超合金使用場合與製造方式的多樣性。然而，鈷基超合金為了能在更高溫下有優異的機械性質，會添加一些元素去增加其耐高溫及抗氧化之性能。本研究利用材料萬能試驗機(MTS) 進行測試，提供三種不同鈦及鋁元素含量之鈷基超合金在溫度 25~ 700℃區間及擬靜態之靜態機械性質。同時解析相對荷載條件之微觀組織形貌，及其與應力、應變、應變速率及溫度之間的關係。所有的結果對鈷基超合金於不同鈦鋁含量下的結構設計，具有重要的應用價值。