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分别对激光熔覆316L不锈钢涂层、热轧316L不锈钢进行纳米压痕试验得到载荷-位移曲线和弹性模量,并对热轧316L不锈钢进行单轴拉伸试验,以此应力应变曲线作为材料属性,通过有限元模拟纳米压痕,得出载荷-位移曲线,与试验进行比较,验证有限元模型的可靠性。对未知属性的316L熔覆层,选取不同的屈服强度(250~375 MPa)和应变硬化指数(0.25~0.375),正交组合分别模拟,通过与试验结果的对比,得出316L熔覆层屈服强度为325 MPa,应变硬化指数为0.3,并分析了载荷-位移曲线参量随材料属性的变化规律。
The load-displacement curve and elastic modulus of laser-clad 316L stainless steel coating and hot-rolled 316L stainless steel were investigated by nano-indentation test. The hot-rolled 316L stainless steel was subjected to uniaxial tension test. The stress-strain curve was taken as material property Through the finite element simulation of nanoindentation, the load-displacement curve was obtained and compared with the test to verify the reliability of the finite element model. For 316L cladding with unknown properties, different yield strength (250 ~ 375 MPa) and strain hardening index (0.25 ~ 0.375) were chosen for orthogonal experiment, and the results were compared with the experimental results to show that 316L cladding layer yield The strength is 325 MPa, the strain hardening index is 0.3, and the variation law of load-displacement curve parameters with the material properties is analyzed.