冷加工过程中316L奥氏体不锈钢硬度压痕尺寸效应分析

通过理论结合试验的方法对冷加工过程中316L奥氏体不锈钢硬度压痕尺寸效应（ISE）进行了分析，并将根据理论模型得到的真实硬度与测试硬度进行了对比。结果表明：不同伸长率下316L奥氏体不锈钢呈现正ISE现象。通过对三种常见的理论模型分析发现，修正比例试样阻力(MPSR)模型能更准确地描述冷加工下316L奥氏体不锈钢的ISE现象，并通过此模型得到了伸长率为0、15%、30%、40%下真实硬度值分别为159.16 MPa、228.07 MPa、259.72 MPa、282.54 MPa，且验证得出各伸长率下的真实硬度与屈服强度之间存在线性关系，随后结合材料的真实硬度值发现，在9.8 N压头载荷下测出经不同静态单轴拉伸后的316 L不锈钢维氏硬度几乎不存在ISE现象。

Hardness Indentation Size Effect Analysis of 316L Austenitic Stainless Steels during Cold Working

The 316L austenitic stainless steel hardness ISE in the cold working processes was analyzed by the theory combined with the test method, and the true hardness obtained by the theoretical model was compared with the test hardness. The results show that the 316L austenitic stainless steel exhibits positive ISE phenomenon under different tensile rates. Through the analyses of three common theoretical models, it is found that the modified proportional specimen resistance(MPSR) model may more accurately describe the ISE phenomenon of 316L austenitic stainless steels under cold working processes, and the true hardness values under 0,15%,30%,40% stretching rates obtained by this model are as 159.16 MPa, 228.07 MPa, 259.72 MPa and 282.54 MPa respectively. The obtained hardness was verified, and the results satisfy the linear theoretical relationship. Then, it is found that the Vickers hardness of 316L stainless steels after different static uniaxial stretching is almost no ISE phenomenon under the 9.8 N indenter load.