淬火圆锯片回火残余应力的研究

该文利用X射线衍射法对淬火圆锯基片不同回火工艺下的残余应力进行了测试分析，同时还测试了基片的洛氏和显微硬度，以研究残余应力在回火过程中的衰减规律.结果表明:①回火早期时，圆锯片硬度降低最快，淬火残余应力的衰减也最快，并很快能达到残余应力消除的水平；而且回火温度越高，圆锯片残余应力降得越快，一定时间后变得比较缓慢，长时间保温则并无作用.②采用均匀的回火冷却方式时，冷却介质对圆锯片残余应力的松弛影响不显著，也不会产生新的热应力. 

Experimental analysis of residual stress of hardened circular blades under different tempering processes.

With the aid of X-ray diffraction and hardness tests, hardened circular blades under different tempering processes were tested along the radius in order to determine the distribution and decline of residual stress, including the Rockwell hardness and micro hardness tests. The results were as follows:① the hardness of hardened circular blades declined rapidly at the early stage of the tempering process; the quenching residual stress also decreased quickly at the same time; changes were slow after a certain amount of time had passed so it had no influence on the steady, long run tempering temperature. ② the decline in residual stress was little affected by cooling in the well distributed cooling process. A new heat stress did not emerge.