深冷处理对D11粉末冶金钢残余应力的影响

Effect of Cryogenic Treatment on Residual Stress of D11 Powder Metallurgical Steel

研究了不同深冷处理时间对D11粉末冶金钢试样显微组织及残余应力的影响。结果表明:与常规热处理相比,深冷处理降低了试样残余应力和表面粗糙度,但硬度值与残余奥氏体含量在深冷前后无显著变化;残余应力的分布与试样显微组织有关,深冷处理24 h后碳化物析出更均匀,残余应力最小。

The effects of cryogenic treatment time on the microstructure and residual stress of D11 powder metallurgical steel were studied.The results show that,compared with the conventional heat treatment,the residual stress and surface roughness of the samples are reduced by cryogenic treatment,but the hardness value and the residual austenite content have no significant changes before and after cryogenic treatment.The distribution of residual stress is related to the microstructure of the samples.After cryogenic treatment for 24 h,the carbide precipitation is more uniform and the residual stress is the minimum.