奥氏体不锈钢塑性变形过程中的应力分布

Stress distribution on austenitic stainless steel during plastic deformation

为了研究奥氏体不锈钢形变后的应力分布规律,以及与马氏体相变行为的关系,对形变后的奥氏体不锈钢板材进行残余应力测试分析,并在相应变形区域进行组织观测。测试中,对奥氏体不锈钢板材进行了单向拉伸试验,并采用无损检测法——X射线衍射(XRD)对不同变形条件下的应力值进行分析;最后,通过有限元模拟进行验证分析,得到了不同变形条件下的应力分布规律。结果表明,变形程度、变形温度、组织相变等因素均对变形后的应力分布规律有一定的影响;随着拉伸载荷的增加,变形复杂度增加,残余应力分布不均匀性增加,测得的应力值增大;随着温度升高,材料本身组织变化,应力值随之减小。

In order to study the stress distribution laws of austenitic stainless steel after deformation and the relationship with martensitic transformation behavior,the residual stress of deformed austenitic stainless steel plate was measured and analyzed,and the microstructure was observed in the corresponding deformation area.During the test,the uniaxial tensile test of austenitic stainless steel plate was carried out,and the stress values under different deformation conditions were analyzed by non-destructive testing method of X-ray diffraction(XRD).Finally,the verification analysis was carried out by finite element simulation,and the stress distribution laws under different deformation conditions were obtained.The results show that the deformation degree,deformation temperature,microstructure phase transition and other factors have certain influence on the stress distribution laws after deformation.Furthermore,with the increasing of tensile load,the deformation complexity increases,the unevenness of residual stress distribution increases,and the measured stress value increases.In addition,with the increasing of temperature,the microstructure of the material itself changes,and the stress value decreases.