摘要
采用电子金相、扫描电镜、硬度计等检测分析手段,对GCr15SiMn钢轴承套圈在磨削过程中脆断原因进行了分析。结果表明:引起套圈开裂的主要原因是由于材料在冶炼过程中吸入一定量的氢气,在锻造轧制及热处理加热过程中,过量的氢原子在高温下固溶于晶格中,当套圈在淬火低温回火后,氢便以分子形式以硫化物夹杂为核心沿晶界析出,形成白点缺陷,使材料的脆性显著增大。进而在淬回火残余应力和磨削应力的交互作用下开裂。
The reason on brittle crack of GCr15SiMn steel bearing ring during grinding process has been analyzed by OM、SEM and Hardometer etc.The results show that the crack of GCr15SiMn steel bearing ferrule belongs to typical hydrogen brittleness crack.Excessive hydrogen,which inhaled in the process of ferrule material smelting,exists in the crsytal lattice in the form of solutionizing atom hydrogen in ferrule after quenching and low-temperature tempering precipitate from grain boundary in the form of molecule centered sulfide inpurity,and then white flake defects appear.The defects lead to strong residual stress in ferrule microstructure,which swell material brittleness notably, and then interactive function grinding stress induce ferrule crack.
出处
《金属热处理》
CAS
CSCD
北大核心
2007年第z1期314-317,共4页
Heat Treatment of Metals
