摘要
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。
316L stainless steel plate was treated by means of surface mechanical attrition treatment (SMAT) technique, and a gradient structure consisting of gradually increased grain size from nano-scale in the surface layer to micro-scale in the matrix was obtained. The SMAT sample was annealed in vacuum at different temperatures, and the structural evolution was analyzed. The results show that no obvious change can be found for the gradient structure when the annealing temperature is lower than 0.5 Tm (Tm is melt point of the steel). With increasing annealing temperature, recovery and grain growth occur in the gradient structure, however the grain growth rate is very low. The release of internal stress and micro-strain induce mechanical twinning below surface layer and martensite transformation in the nanostructured surface layer during annealing.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2005年第4期12-16,共5页
Transactions of Materials and Heat Treatment
基金
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
关键词
316L不锈钢
表面纳米化
退火
组织
Annealing
Grain growth
Martensitic transformations
Microstructure
Surface treatment
Transmission electron microscopy
X ray diffraction analysis
作者简介
王爱香（1978-），女，福州大学与中国科学院金属研究所联合培养硕士研究生，主要从事316L不锈钢组织与性能热稳定性研究，E-mail：axwang@imr．ac．cn。
