研究了热处理工艺对渗碳轴承钢组织、力学性能的影响规律,并探讨了强韧化机制。研究表明,随着淬回火温度升高和回火次数增加以及采用深冷工艺,渗碳轴承钢的强度与硬度增加,冲击韧性值下降。采用910℃淬火和180℃二次回火,轴承钢材料性能可达到硬度HRC 45.2,抗拉强度Rm为1 450MPa,屈服强度ReL为1 240MPa,AKU为105J,残余奥氏体的体积分数控制在1%以下。试验钢良好的强韧性配合主要来自于晶粒的细化、超细马氏体板条和均匀弥散的细小碳化物的析出;尺寸稳定性的效果主要是残余奥氏体量的控制。
The effect of heat treatment process on microstructure and mechanical properties of bearing steel was studied,and the mechanism of strengthening-toughening of the steel was also discussed.The results show that,with the increasing of quenching and tempering temperature and the number of tempering,as well as the use of acryogenic technology,the strength and hardness of carburizing bearing steel increases and the impact ductility decreases.Quenching at 910℃ and tempering twice at 180℃,the mechanical properties of bearing steels can reach HRC is 45.2,Rm is 1450MPa,ReL is 1240MPa and AKU is 105J;Residual austenite quantity can be controlled less than 1%.The better match of strength and toughness is attributed to grain refinement,ultra-fine martensitic variants,and large number of fine dispersed carbides.The dimensional stability of the steel is due to the control of the content of residual austenite.
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