利用带有正四棱锥形金刚石压头的Vickers显微硬度计对0Cr18Ni10Ti不锈钢焊接接头的焊 缝、母材、熔合区及热影响区的压痕尺寸效应进行了研究, 实验载荷为0.098---4.9 N, 载荷保持时间均为10 s. 结果表明, 接头各区域的显微硬度在较小的载荷下随实验载荷的增加而减小, 当载荷 超过1.96 N时各区域硬度值基本保持恒定. 采用PSR模型对接头各区域硬度值随载荷的变化规律进行了较为准确的描述, 得到的HV PSR与1.96 N载荷下的实验结果间的误差小于3 %. 在2.94 N的 实验载荷下沿垂直接头方向连续进行了微压痕测试, 得到接头在不同位置处的显微硬度分布曲线, 并对接头的金相组织进行了观察和分析.
Vicker’s microhardness tester equipped with diamond pyramid indenter was used to carry out microhardness tests on 0Cr18Ni10Ti stainless steel welded joint. Indentaion size effects (ISE) of different regions at the joint, including the weld metal (WM), base metal (BM), fusion zone (FZ) and heat-affected zone (HAZ) were studied at loads varying from 10 to 500 g for a constant dwell time of 10 s. The results show that the microhardness for each region of the welded joint decreases with the increasing load at comparatively low loads, and then tends to invariable as the indentation load exceeds 200 g. The PSR model was adopted to accurately describe the variation of the hardness as a function of indentation test load. The error between the tested hardness at 200 g of applied load and the calculated value using this model is less than 3%. Indentation tests were also successively performed across the welded joint to evaluate the distribution of the microhardness for different regions of the welded joint and optical microstructures are observed and analyzed. The yield stress distribution of the welded joint was also calculated according to its relationship with the hardness.
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