论文部分内容阅读
本文叙述了材料为9Cr18的三极管封装模具磨削裂纹产生的原因,通过对模具的裂纹形态、表面组织结构、硬度、残余奥氏体含量、表面残余应力等进行测试与分析,指出模具产生裂纹及其表面变质层的主要原因是模具的磨削规范不合理,其次是模具的基体组织内残余奥氏体含量偏高。改进模具的磨削工艺参数、改善模具的磨削冷却条件、提高模具的回火温度是降低模具基体组织中的残余奥氏体含量的有效途径。9Cr18钢缺口敏感性极大,易发生脆化而产生应力裂纹;对于超高强度钢、新型不锈钢磨削产生的表面变质层的问题,人们日益重视起来。
This paper describes the reasons for the crack in the 9Cr18 triode package mold. The crack shape, surface structure, hardness, residual austenite content, residual stress and so on are tested and analyzed. The main reason for the deterioration of the surface layer is the mold grinding norms unreasonable, followed by the matrix of the mold matrix retained austenite content is high. Improve the mold grinding process parameters to improve the grinding and cooling conditions of the mold and improve the tempering temperature of the mold is to reduce the matrix matrix of the residual austenite effective way. 9Cr18 steel notch sensitivity is extremely large, prone to embrittlement and stress cracks; for ultra-high strength steel, the new stainless steel surface modification of the surface layer of the problem, people pay more and more attention.