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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。
The dynamic tensile test of ferritic-austenite duplex stainless steel thin films was carried out under transmission electron microscope. The plastic deformation process and dislocation distribution of crack tip were observed in situ. It was found that in the ferrite phase and austenite In the phase, the dislocation configuration of the crack tip is obviously different. In the ferrite phase, the dislocation-free dislocation zone is larger, and the slip prone to slip and slip, forming a larger plastic zone in the front of the crack. In the austenite phase, the dislocation-free zone is smaller and the dislocations emitted are inversely plugged in the slip plane. The choice of slippage system in both phases is related to the Schmid factor. However, when the deformation is large, the choice of the secondary slip system in the austenite phase is no longer dominated by the Schmid factor.