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    激光淬火对不同预处理18CrNiMo7-6钢表面组织和硬度的影响

    Effect of Laser Quenching on Surface Microstructure and Hardness of Different Pretreatment 18CrNiMo7-6 Steel

    • 摘要: 对18CrNiMo7-6钢分别进行调质预处理和伪渗碳预处理,再在不同激光功率(1 000,1 500,2 000,2 500,3 000,3 500 W)和不同扫描速度(2,4,6,8,10,12 mm·s−1)下进行激光淬火处理,研究了激光功率和扫描速度对表面硬化层组织、硬度和深度的影响。结果表明:经过激光淬火后,伪渗碳预处理和调质预处理试验钢的表面硬化层组织基本以低碳马氏体为主;随着激光功率的增加或扫描速率的减小,2种预处理试验钢的硬化层深度均增加,相同激光功率或扫描速度下,伪渗碳预处理试验钢的硬化层深度更大,硬化层硬度略高。2种预处理试验钢表面经激光淬火处理后,硬化层硬度均低于渗碳淬火处理后(700 HV)。

       

      Abstract: The quenching-tempering pretreatment and pseudo-carburizing pretreatment of 18CrNiMo7-6 steel were carried out respectively, and then laser quenching was carried out under different laser power (1 000, 1 500, 2 000, 2 500, 3 000, 3 500 W) and different scanning speed (2, 4, 6, 8, 10, 12 mm · s−1). The effects of laser power and scanning speed on the microstructure, hardness and depth of the surface hardening layer were studied. The results show that after laser quenching, the surface hardened layer microstructure of pseudo-carburizing and quenching-tempering pretreatment was mainly composed of low carbon martensite. With the increase of laser power or the decrease of scanning rate, the hardened layer depth of the two pretreatment test steels increased. Under the same laser power or scanning speed, the hardened layer depth of the pseudo-carburizing pretreatment test steel was larger, and the hardness of the hardened layer was slightly higher. The hardness of hardened layer after laser quenching was lower than that after carburizing quenching (700 HV).

       

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