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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 influence of heat treatment process on microstructure and mechanical properties of carburized bearing steel was studied, and the mechanism of toughening and toughening was also discussed. The results show that with the increase of quenching and tempering temperature and the number of tempering and the use of cryogenic process, the strength and hardness of carburized bearing steel increases, the impact toughness value decreases. Using 910 ℃ quenching and 180 ℃ secondary tempering, the bearing steel material properties can reach hardness HRC 45.2, tensile strength Rm of 1 450MPa, yield strength ReL of 1 240MPa, AKU of 105J, retained austenite volume fraction controlled at 1 %the following. The good strength and toughness of the test steel is mainly due to grain refinement, ultra-fine martensite laths and finely dispersed fine carbides. The effect of dimensional stability is mainly controlled by the amount of retained austenite.