18-18-0.5N高氮奥氏体不锈钢冷轧变形过程中的组织演变和形变强化

Microstructure evolution and mechanical hardening of 18-18-0.5N high-nitrogen austenitic stainless steel during cold rolling

利用XRD、TEM、SEM和拉伸实验等分析测试方法研究了18-18-0.5N高氮奥氏体不锈钢在冷轧变形过程中的组织演变和形变强化规律.结果发现:18-18-0.5N高氮奥氏体不锈钢在冷变形过程中并未发生形变诱导相变,微观组织和力学性能在变形量为43.8%附近出现转折.提出了屈服强度随应变变化的预测方程.

XRD, TEM, SEM and tension testing were used to investigate the microstructure evolution and mechanical hardening of 18-18-0.5N high-nitrogen austenitic stainless steel during cold rolling. The experimental results show that there is no sign of deformation-induced phase transformation. A inflection point of microstructure and mechanical properties was found at 43.8 % reduction. An excellent predicting equation of yield strength to strain was presented.