本實驗以 MAR-M200+Hf 鎳基超合金進行不同下抽速度之單方向凝固製 程後，再經過熱處理條件進行熱處理，來觀察微觀組織對機械性質的影響，
將所得到的實驗結果加以分析討論後，得到結論如下:
1. 原材及經過 DS 鑄造後之試棒探討，原材的晶粒尺寸為 1.52mm，下拉速率 60mm/hr 晶 粒 尺 寸 約 為 5.59mm ， 下 拉 速 率 120mm/hr 晶 粒 尺 寸 約 為 3.72mm，而下拉速率 180mm/hr 晶粒尺寸約為 3.54mm 冷卻速率慢造成晶 粒成長時間較長形成較大的晶粒尺寸且γ'形狀慢慢成長為 dendrite 形狀。 性質，下拉速率 60mm/hr 是由大面積的[001]優選方向所分佈，及有少部分 的[104]、[116]偏析方向所組成，角度上相差 15 度。
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