滚轮浸渍裂纹失效机制分析

Analysis of dipping crack failure mechanism of contact roller

通过金相分析及显微硬度测量,结合元素含量测定,分析浸渍处理过程中船用柴油机滚轮裂纹的产生机制。结果表明,在加工过程中未充分释放的热处理和磨削残余应力产生叠加,在浸渍处理时滚轮出现应力腐蚀现象,表面产生裂纹。原材料中的部分缺陷,促进了磨削残余拉应力的产生。

Crack generation mechanism of contact roller of marine diesel engine during dipping treatment was analyzed by means of metallographic analysis,microhardness measurement and element content measurement. The results show that the overlying of heat treatment and grinding residual stress which were not fully released during the processing process and the corrosion environment in dipping treatment result in stress corrosion of the roller and the surface crack occurs during the dipping treatment. Some defects in raw materials promote the generation of residual tensile stress in grinding.