1. In this study, the Cu-bearing DP steels exhibit great aging strengthening effect, and the formation of BCC Cu clusters is said to be the primary strength contributors at the peak aging condition. However, direct evidence at peak aging should be further clarified with the aid of advanced TEM. For example, Cs-corrected STEM HAADF provides clear lattice image with atomic Z-contrast that makes it possible to
investigate the BCC Cu clusters in the matrix.
2. The qualitative research on the aging behavior of Cu-bearing DP steels has been done. In addition, the quantification of strength contribution owing to the two type of precipitates, i.e. interphase-precipitated carbides and nano-sized Cu particles, should be calculated by the precipitation hardening models.
3. The dual precipitation phenomenon has been investigated with the method of STEM EDS mapping and HRTEM diffractogram. However, the detailed mechanism of dual precipitation and the structure as well as element distribution within a single carbide still remain unknown. As a result, advanced characterization technique such as atom probe tomography or Cs-corrected TEM should be utilized to analyze.
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