高压热处理对35CrMo钢组织与硬度的影响

采用光学显微镜、扫描电镜、透射电镜和硬度计分析和测试了35CrMo钢经高压热处理结合高温回火后的组织和硬度,并与传统调质工艺处理后作比较。结果表明,高压热处理后35CrMo钢经高温回火后可析出弥散分布的颗粒状碳化物,有效提高了35CrMo钢的硬度。经3 GPa压力、860 ℃×20 min高压热处理+550 ℃×60 min回火后,35CrMo钢的硬度为45 HRC,较同工艺传统调质处理提高了7.14%。

Effect of high pressure heat treatment on microstructure and hardness of 35CrMo steel

Microstructure and hardness of 35CrMo steel treated by high pressure heat treatment combined with high temperature tempering were analyzed and tested by metallographic microscope, scanning electron microscope, transmission electron microscope and hardness tester, and compared with the traditional quenching and tempering process. The results show that after high pressure heat treatment and high temperature tempering, 35CrMo steel can precipitate dispersed granular carbides, the hardness of the 35CrMo steel is effectively improved. After 3 GPa pressure, high pressure heat treatment at 860 ℃ for 20 min and tempering at 550 ℃ for 60 min, the hardness of the 35CrMo steel is 45 HRC, which is 7.14% higher than that treated by the traditional quenching and tempering with the same process.