Effect of surface quenching process on hardened layer of 42CrMo steel for large bearing ring

doi:10.13251/j.issn.0254-6051.2022.10.037

Abstract

Abstract: 42CrMo medium carbon bearing steel was surface quenched with different temperatures and quenching mediums. Then the microstructure and hardness of different regions of the quenched specimens were tested and analyzed by means of Rockwell hardness tester, metallographic microscope, scanning electron microscope and transmission electron microscope. The results show that after surface quenching treatment, according to the hardness from large to small, the specimen can be divided into three different regions: hardened zone, transition zone and base material. The depth of surface hardened layer increases with the increase of surface quenching heating temperature, and that of oil quenching is significantly reduced compared with that of water quenching. Microstructure analysis shows that the microstructure in the water quenching hardened zones are all martensite, while the oil quenching has a slow cooling rate, which causes that the hardened zone is martensitic+ferrite. The transition zones under different surface quenching conditions are all martensite+tempering sorbite. Furthermore, the base material is the tempered sorbite in the original quenched and tempered state. Differences in the microstructure of hardened zone, transition zone and base material leads to differences in hardness in different regions. In practical applications, appropriate heating temperature for water quenching should be selected according to the required depth of the hardened layer.

Key words: surface quenching, hardened layer, 42CrMo bearing steel, Rockwell hardness, microstructure

CLC Number:

TG156.3

Wei Shitong, Wu Changjiang, Zheng Leigang, Hu Xiaoqiang, Lu Shanping. Effect of surface quenching process on hardened layer of 42CrMo steel for large bearing ring[J]. Heat Treatment of Metals, 2022, 47(10): 218-223.

References

[1]公平, 陈雪骑, 于庆杰, 等. 航空发动机中介轴承流场与润滑影响因素分析[J]. 轴承, 2021(8): 16-21.
Gong Ping, Chen Xueqi, Yu Qingjie, et al. Analysis on flow field and influencing factors of lubrication for aero-engine intermediate bearing[J]. Bearing, 2021(8): 16-21.
[2]霍新新, 范寿孝, 王森, 等. 大型抽水蓄能机组推力轴承运行特点研究[J]. 黑龙江电力, 2021, 43(3): 209-212, 240.
Huo Xinxin, Fan Shouxiao, Wang Sen, et al. Research on the operation characteristics of thrust bearings of large pumped storage unit[J]. Heilongjiang Electric Power, 2021, 43(3): 209-212, 240.
[3]曾志, 马德生. 大型风电机组变桨轴承套圈锻件性能研究[J]. 风能, 2021(8): 64-70.
Zeng Zhi, Ma Desheng. Study on the performance of rotor bearing ring forgings for large wind turbines[J]. Wind Energy, 2021(8): 64-70.
[4]黄旭就. 关于国内盾构机开发的探讨[J]. 装备制造技术, 2006(2): 3-7, 11.
Huang Xujiu. Discussion on shield machine development[J]. Equipment Manufacturing Technology, 2006(2): 3-7, 11.
[5]陈佳璋. 大直径(ϕ11.58 m)盾构机刀盘驱动装置用回转支承国产化的探讨[J]. 传动技术, 2010, 24(3): 25-28.
Chen Jiazhang. On approach of domestic swing bearing for large-diameter (ϕ11.58 m) shield machine cutter drives[J]. Drive System Technique, 2010, 24(3): 25-28.
[6]尤绍军. 我国轴承钢及热加工技术的现状和研究方向[J]. 金属热处理, 2012, 37(1): 119-125.
You Shaojun. Status and research directions of bearing steels and heat processes in China[J]. Heat Treatment of Metals, 2012, 37(1): 119-125.
[7]刘雅政, 周乐育, 张朝磊, 等. 重大装备用高品质轴承用钢的发展及其质量控制[J]. 钢铁, 2013, 48(8): 1-8.
Liu Yazheng, Zhou Leyu, Zhang Chaolei, et al. Development and quality control of bearing steel for heavy equipment[J]. Iron and Steel, 2013, 48(8): 1-8.
[8]李欣, 李晓峰. 轴承零件表面淬火工艺探索[J]. 哈尔滨轴承, 2015, 36(4): 20-21, 28.
Li Xin, Li Xiaofeng. Exploration on surface hardening process of bearing parts[J]. Journal of Harbin Bearing, 2015, 36(4): 20-21, 28.
[9]王程, 刘杰, 顾彩香, 等. 两种表面淬火方法对结构钢热物性能的影响[J]. 金属热处理, 2018, 43(9): 214-218.
Wang Cheng, Liu Jie, Gu Caixiang, et al. Effects of two surface quenching methods on thermal properties of structural steel[J]. Heat Treatment of Metals, 2018, 43(9): 214-218.
[10]贾士武, 张爱茹. 减少机床导轨表面淬火畸变的措施[J]. 金属热处理, 2002, 27(1): 43-44.
Jia Shiwu, Zhang Airu. The way to reduce distortion of machine tool slide guide during surface hardening[J]. Heat Treatment of Metals, 2002, 27(1): 43-44.
[11]Huang W H, Zhong H G, Lei L P, et al. Microstructure and mechanical properties of multi-pass forged and annealed 42CrMo steel[J]. Materials Science and Engineering A, 2022, 831: 142191.
[12]刘雅政, 黄斌, 蒋波, 等. 盾构机轴承用钢的开发与质量控制[J]. 钢铁, 2004, 49(5): 1-6, 12.
Liu Yazheng, Huang Bin, Jiang Bo, et al. Development and quality control of bearing steel for tunnel shield machine[J]. Iron and Steel, 2004, 49(5): 1-6, 12.
[13]霍晓磊, 史亚妮, 李崇崇, 等. 大尺寸三排圆柱滚子转盘轴承滚道分面感应淬火工艺[J]. 轴承, 2019(2): 23-26.
Huo Xiaolei, Shi Yani, Li Chongchong, et al. Faceted induction hardening process for raceway of large scale three row cylindrical roller slewing bearings[J]. Bearing, 2019(2): 23-26.
[14]霍晓磊, 李崇崇, 史亚妮, 等. 沟道位置不对称四点接触球轴承滚道表面淬火工艺研究[J]. 热处理技术与装备, 2018, 39(1): 49-51.
Huo Xiaolei, Li Chongchong, Shi Yani, et al. Development and quality control of bearing steel for tunnel shield machine[J]. Heat Treatment Technology and Equipment, 2018, 39(1): 49-51.
[15]史亚妮, 霍晓磊, 朱战旗, 等. 推力球轴承沟道表面感应淬火工艺的改进[J]. 轴承, 2018(6): 24-25.
Shi Yani, Huo Xiaolei, Zhu Zhanqi, et al. Improvement on surface induction quenching process for raceway of thrust ball bearings[J]. Bearing, 2018(6): 24-25.