某303Se不锈钢高锁螺母沿轴线方向开裂,采用金相检验、硬度测试、扫描电镜分析、残余应力测试等方法对其开裂原因进行分析,结果表明:303Se不锈钢在冷挤压过程中,其抗拉强度升高、塑性降低,因此其径向承载能力变差,在高载荷作用下发生开裂;对产品工艺进行优化可有效地提高不锈钢高锁螺母的径向承载能力。

A 303Se stainless steel high lock nut cracked along the axis direction. The causes of cracking were analyzed by metallographic examination, hardness test, scanning electron microscope analysis and residual stress test. The results show that the tensile strength of 303Se stainless steel increased and the plasticity decreased during cold extrusion, so the radial bearing capacity of 303Se stainless steel became worse and cracking occured under high load. The product process optimization could effectively improve the radial bearing capacity of stainless steel high lock nut.