在透射电子显微镜下对铁素体-奥氏体双相不锈钢薄膜试样进行了动态拉伸试验,原位观察了裂纹尖端塑性变形过程和位错分布,发现在铁素体相和奥氏体相中,裂尖位错组态有明显差异。在铁素体相中,裂尖无位错区较大,且让错易发生交滑移,在裂纹前端形成较大的塑性区。在奥氏体相中,裂尖无位错区较小,发射的位错在其滑移面内逆塞积。两相中裂尖滑移系的选择都与裂尖Schmid因子有关。但当形变较大时,奥氏体相中裂尖二次滑移系的选择不再为裂尖Schmid因子所支配。
In the ferrite grains, the dislocation emitted by the crack tips maycross-slip out of the original slip planes and form a broad plastic zone. However, inaustenite, the dislocation free zone is small and the dislocations emittee by the crackpile-up in its slip plane. The selection of the slip planes at the crack tip depend onthe Schmid factor of crack tip in both phases. But after large deformation, the se-lection of the second slip systems at the crack tip in austenite does not depend on theSchmid factor.
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