论文部分内容阅读
通过对GH4105合金冷拉棒材组织分析,力学性能试验,拉伸断口分析以及残余应力测试等方法,摸索出合金冷拉棒材热处理开裂原因:即棒材次表面存在的残余应力集中和细小缺陷,会在热处理过程中的热应力和残余应力作用下迅速向内扩展从而导致开裂。在此基础上提出合理可行的解决途径:即把冷拉棒表面碎晶层以及残余应力集中层有效去除。试验结果表明,热处理后合金棒材表面状态良好,未见宏观裂纹和开裂产生,棒材性能满足了零部件制造的技术要求。
Through the microstructure analysis, mechanical property test, tensile fracture analysis and residual stress test of GH4105 alloy cold-drawn bar, the causes of heat treatment cracking of alloy cold-drawn bar were found out: the residual stress concentration and minor defects , Will rapidly expand inward due to thermal stress and residual stress during heat treatment, resulting in cracking. On this basis, a reasonable and feasible solution is proposed: that is, the surface of the cold drawn bar broken layer and the residual stress concentration layer effectively removed. The test results show that the surface condition of the alloy bar after heat treatment is good, no macro cracks and cracking are generated, and the bar performance meets the technical requirements of component manufacturing.