316L不锈钢梯度结构及其在退火中的演变Surface Gradient Structure of 316L Stainless Steel Treated by SMA and its Evolution During Annealing
王爱香,刘刚,周蕾,吕爱强,杨晓华,李瑛
摘要(Abstract):
对316L不锈钢进行表面机械研磨处理(SMAT),获得表面为纳米晶、晶粒尺寸沿厚度方向逐渐增大的梯度组织。对SMAT样品进行不同温度的真空退火,研究组织变化。结果表明:当退火温度低于0.5Tm(Tm为熔点)时,316L不锈钢经SMAT后形成的梯度组织未发生明显的变化。随着退火温度的继续增加,梯度组织发生回复和晶粒长大,但晶粒长大的速度较小。整个退火过程中,内应力和微观应变的释放在SMAT样品的深度方向诱发了机械孪生,并在纳米结构表层中引起马氏体相变。
关键词(KeyWords): 316L不锈钢;表面纳米化;退火;组织
基金项目(Foundation): 国家自然科学基金项目(50071061);; 中国科学院知识创新工程重要方向项目;; 国家“863”计划项目资助
作者(Author): 王爱香,刘刚,周蕾,吕爱强,杨晓华,李瑛
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