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中文摘要：
利用表面机械研磨处理技术,在301奥氏体不锈钢中得到晶粒尺度呈梯度分布的变形表层,进行了压缩试验和微观组织观察。结果表明,变形表层中晶粒可细化至100nm。相比原始态的屈服强度236MPa,具有变形梯度表层后屈服强度增加到436MPa,变形后的加工硬化指数为0.31,经400和700℃的退火后分别增加到0.32和0.35。另外,随着应变速率的增加,流变应力增大而加工硬化能力降低。
英文摘要：
The gradient nanostructured layer was synthesized on the surface of the 301 stainless steel by means of the surface mechanical attrition treatment （SMAT）. The compression tests together with microstructural characterization were conduc- ted. The results show that the grain size is refined to about 100 nm in the deformed layer. The microstructure with the gradient layer increases its yield strength to 436 MPa, as compared 236 MPa of original state. The strain hardening exponent after de- formation increases from 0. 31 to 0. 32 and 0. 35, respectively, after annealing at 400 ℃ and 700 ℃. Furthermore, the flow stress increases with strain rate increasing while strain hardening decreases.
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