通过对16Cr14Co12Mo5轴承钢经冷处理后的组织和性能进行研究,发现与淬火态相比,试验钢经两次冷处理和高温回火后,表面硬度达到50.7HRC,抗拉强度Rm达到1 820MPa,屈服强度Rp0.2达到1 410MPa,冲击功为75.0J,试验钢的强度和硬度得到了显著提高。经XRD检测,经过两次冷处理后残余奥氏体体积分数由26.0%下降到3.1%。研究表明,经过2次冷处理并配合高温回火后,钢中残余奥氏体88.1%转变为马氏体,残余奥氏体含量明显降低,组织变得稳定,并且在回火过程中伴随有一定量微细第二相的析出。
The microstructure and mechanical properties of cold treatment 16Cr14Co12Mo5 bearing steel was investigated.Compared to the quenching state,experimental steel through two cold treatment and high tempering,the surface hardness reached 50.7HRC,the tensile strength Rm reached 1 800 MPa and yield strength Rp0.2 reached 1 400 MPa,the values of ballistic work was 75.0 J,the strength and hardness of experimental steel had been significantly enhanced.By XRD detection,after twice cold treatment austenite content dropped from 26.0% to 3.1%.This results show that after cold treatment and the high tempering,in steel 80% of austenite transformed into martensite,austenite content is significantly reduced,organization becomes more stable,and a certain amount of fine second phases can be separated out in the process of tempering.
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