GCr15轴承钢真空淬火组织与性能  

Microstructure and properties of GCr15 bearing steel by vacuum quenching

作　　者：余松平 杨闯[2] 甘露 张兴国 林钰 YU Shongping;YANG Chuang;GAN Lu;ZHANG Xinguo;LIN Yu

机构地区：[1]中航力源液压股份有限公司,贵州贵阳550018 [2]贵州师范大学材料与建筑工程学院,贵州贵阳550025

出　　处：《现代机械》2022年第2期87-90,共4页Modern Machinery

基　　金：贵州省科学技术基金项目(合同编号:黔科合成果[2019]4020号)。

摘　　要：采用真空油淬的方法对GCr15轴承钢进行了淬火处理,对真空油淬后的组织和硬度进行了研究。结果表明,真空油淬的油面压强为1~10 Pa,淬火转移时间为30 s时,GCr15钢经低温回火后的组织为隐晶马氏体+珠光体+碳化物,碳化物粗大且分布不均匀,平均硬度为51.2 HRC,硬度均匀性较差。当真空油淬的油面压强为1.5×10^(5) Pa,淬火转移时间为13 s时,低温回火后的组织为隐晶马氏体+弥散分布碳化物,碳化物细小,呈均匀分布,试样平均硬度为63.2 HRC,硬度均匀性好。提高淬火油面压强和缩短淬火转移时间,能极大提高GCr15钢的硬度并且硬度均匀。GCr15 bearing steel was treated by vacuum oil quenching, and its microstructure and hardness after quenching were studied.The results showed that, when the pressure of vacuum quenching oil surface was 1 Pa to 10 Pa, and the quenching transfer time was 30 s, the microstructure of GCr15 steel was cryptocrystalline martensite, pearlite and carbide, the carbide was coarse and unevenly distributed, and the mean hardness was 53.2 HRC with poor uniformity.When the pressure of vacuum quenching oil surface was 1.5×10^(5) Pa, and the quenching transfer time was 13 s, the microstructure of GCr15 steel was cryptocrystalline martensite and dispersed carbide, the carbide was fine and evenly distributed, and the mean hardness was 63.2 HRC with good uniformity.By increasing the quenching oil surface pressure and shortening the quenching transfer time, the high and uniform hardness can be obtained.

关 键 词：GCR15轴承钢 真空油淬 组织 硬度 

分 类 号：TG156.3[金属学及工艺—热处理] TG142.3[金属学及工艺—金属学]