댓글 0건 조회 468회 작성일 2021-08-26 15:38
Chemical and microstructural analyses were performed on Ni depletion zones in 304 austenitic stainless steel
sheets after annealing and cooling with three different rates (0.2, 18.6, 160.0 ◦C/s). The analysis was focused on
the characteristics and the origin of the retained δ-ferrite and α’-martensite phases in the austenite matrix.
Simultaneous Ni depletion and Cr enrichment belong to the retained δ-ferrite due to incomplete decomposition
after the solidification process. Athermal α’-martensite was observed to grow within Ni-depleted zones with no
Cr enrichment. The fraction of α’-martensite increases as the cooling rate increases. EPMA analysis reveals that
the 1 wt% reduction of Ni contents to the bulk chemical composition promotes the thermally-activated
martensitic transformation. Such athermal martensite tended to grow within twinning boundaries holding the
Nishiyama-Wassermann orientation relationship with the austenite matrix confirmed with the electron diffraction
patterns in TEM and the misorientation analysis in EBSD.
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