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 local deformation bands formed ahead of crack tip both in ferrite and in austenite were in situ observed under TEM during deformation process of a ferrite-austenite duplex stainless steel. It is dominated by crack tip Schmid factors, dislocation shielding latent hardening and hardening coefficient. If the crack tip slip system was preferably activated by pure mode Ⅱ resolute and the decreasing rate of hardening coefficient was enough, then the local deformation band ahead of crack tip was easy to be formed.
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