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在透射电子显微镜(TEM)下对铁素体-奥氏体双相不锈钢薄膜拉伸试样进行了动态拉伸实验,发现在铁素体相和奥氏作相中在裂纹尖端有与裂纹扩展方向接近一致的局部形变带生成,其形成与裂尖Schmid因子、位借的屏蔽效应、潜在硬化和硬化系数的变化规律有关.当裂纹尖端优先在纯II型应力分量作用下开动与裂纹共面的滑移系、并且有合适的硬化系数下降速率时,裂尖易形成局部形变带。
The dynamic tensile tests of ferritic-austenite duplex stainless steel thin films were carried out under transmission electron microscope (TEM), and it was found that there were some cracks in the ferrite phase and austenite phase at crack tip The formation of a local deformation zone with nearly uniform directions is related to the Schmid factor, the shielding effect, potential hardening and hardening coefficient.When the tip of the crack preferentially starts to be coplanar with the crack under the action of pure type II stress component Of the slip system, and a suitable rate of decline of the hardening coefficient, the crack tip is easy to form a local deformation zone.