M2高速钢的影响表面复合强化的研究

A study on combined surface modification of M2 high speed steel

对比了分别经可控渗氮、离子注入形成TiN及可控渗氮 +离子注入Ti2 +后 ,M2高速钢零件(精冲模 )的寿命实验 .结果表明 ,采用可控渗氮 +离子注入Ti2 +的复合处理工艺 ,可使零件的使用寿命获得明显提高 .断口分析、表面硬度测试、金相分析、XRD和AES分析表明 ,寿命的提高是由于 :①用Jonsson经验公式测得的该TiN注入层的真实硬度为HV3 0 0 0 ,TiN的超高硬度是寿命提高的根本原因 .②该复合工艺可使M2高速钢表面TiN注入层获得较厚较硬的氮化过度层 ,增强了膜基间的结合力 ,从而提高了零件的抗磨损和抗冲击性能 .③渗氮层增加了钛离子的注入深度 ,获得了更宽的TiN改性层 ,用JT -PRII所得到的模拟计算结果与此吻合得很好 .

The life experiments of W6Mo5Cr4V2 high speed steel dies treated respectivelly by controlled nitriding、ion implantation with Ti 2+ +N 2+ and a combined technique of controlled nitriding and implantation with Ti 2+ were made. The result shows that, compared with other two techniques, the combined technique can improve the life of the dies by a large margin. Besides the ultrahigh hardness of TiN coating, the thicker and harder nitriding layer, which transited from TiN coating to substrate of M2 high speed steel , contribute greatly to the life improvement. The transition layer not only strenthen the binding force between coating and substrate, but also widen the projectint depth of implanted Ti 2+ ion which leads to a thicker TiN modification layer and consist with the computer simlation result of JT-PRII software developed by oursleves.