发动机缸体铸铁件消应热处理工艺的评价

发动机缸体铸铁件生产过程中产生的铸造残余应力需要采取合适的热处理工艺消除，缸体热处理前后的残余应力变化情况可用于评价热处理工艺的有效性．文中首次采用压痕应变法与深孔法相结合，分别测量发动机缸体表面与内部残余应力分布规律，综合评价了发动机缸体铸铁件热处理前后的残余应力水平．两种不同型号缸体热处理前后残余应力测量结果表明，目前的热处理工艺并不能有效降低残余应力峰值，该热处理工艺需要进一步优化调整或考虑取消现有的热处理工艺方案．

Evaluation of Stress Relief Heat Treatment Process for Cast Iron Cylinder Block

Residual stress in the cast iron cylinder block needs to be removed. The variation of the residual stress can be used to evaluate the effectiveness of heat treatment process. The indentation strain-gage method and the deep-hole drilling method were combined to measure the residual stress distribution on the surface and inside of two types of cast iron cylinder blocks separately. The variation of residual stress before and after heat treatment was comprehensively evaluated. The results showed that the current heat treatment process can not reduce the peak value of residual stress effectively and is not suitable for adjusting the residual stress distribution. The current heat treatment process should be further optimized to ensure the safety of products or cancelled for the perspective of economy.