Analysis on modification behavior of rare earth to inclusions in highly clean bearing steel
YANG Chao-yun1,2, ZHUANG Quan3, LIU Hang1, LUAN Yi-kun1,2, CHEN Xing-qiu1,2, LI Dian-zhong1,2
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China; 2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, Liaoning, China; 3. Wafangdian Bearing Group Co. , Ltd. , Dalian 116300, Liaoning, China
Abstract：To clarify the modification behavior of rare earth to inclusions in highly clean bearing steel for the purpose of providing references for rare earth (RE) treated bearing steel, highly pure RE alloy was added to highly clean bearing steel, and inclusions and their precipitation behaviors in bearing steel with different RE contents were characterized and analyzed with scanning electron microscopy and energy disperse spectroscopy. The results show that RE addition can modify Al2O3 and MnS inclusions into RE inclusions in highly clean bearing steel. The RE-S-As-P inclusion can act as the nucleus of RE-O-S-As-P-C inclusion to promote its precipitation. With the increase of RE content, the reaction sequence of RE elements with inclusion forming elements should be O, S, As, P and C successively, and the evolution sequence of RE inclusion type is expected to be mainly RE2O3、RE2O2S、RES、RE-O-S-As、RE-S-As、RE-S-As-P、RE-O-S-As-P-C、RE-O-As-P-C、RE-O-P-C和RE-O-C.
YANG C Y, LUAN Y K, LI D Z, et al. Effects of rare earth elements on inclusions and impact toughness of high-carbon chromium bearing steel[J]. J Mater Sci Technol, 2019, 35(8): 1298.
[2]
GAO J Z, FU P X, LIU H W, et al. Effects of rare earth on the microstructure and impact toughness of H13 steel[J]. Metals, 2015(5): 383.
[3]
LIU H H, FU P X, LIU H W, et al. A novel large cross-section quenching and tempering mold steel matching excellent strength-hardness-toughness properties[J]. Mater Sci Eng: A, 2018(737): 274.
Adabavazeh Z, Hwang W S, SU Y H. Effect of adding cerium on microstructure and morphology of Ce-based inclusions formed in low-carbon steel[J]. Sci Rep, 2017(7): 46503.
[6]
LI Y D, LIU C J, ZHANG T S, et al. Liquid inclusions in heat-resistant steel containing rare earth elements[J]. Metall Mater Tran B, 2017(48B): 956.
[7]
LIU Y Q, WANG L J, CHOU K C. Effect of cerium on the cleanliness of spring steel used in fastener of high-speed railway[J]. J Rare Earth, 2014, 32(8): 759.
ZHANG S H, YU Y C, WANG S B, et al. Effects of cerium addition on solidification structure and mechanical properties of 434 ferritic stainless steel[J]. J Rare Earth, 2017, 35(5): 518.
[10]
PAN F, CHEN H L, SU Y H, et al. Inclusions properties at 1 673 K and room temperature with Ce addition in SS400 steel[J]. Sci Rep, 2017(7): 2564.
[11]
XIN W B, SONG B, SONG M M, et al. Effect of cerium on characteristic of inclusions and grain boundary segregation of arsenic in iron melts[J]. Steel Res Int, 2015, 86(12): 1430.
[12]
PAN F, ZHANG J, CHEN H L, et al. Thermodynamic calculation among cerium, oxygen, and sulfur in liquid iron[J]. Sci Rep, 2016(6): 35843.
[13]
WANG H P, XIONG L, ZHANG L, et al. Investigation of RE-O-S-As inclusions in high carbon steels[J]. Metall Mater Tran: B, 2017(48B): 2849.
[14]
Waudby P E. Rare earth addition to steel[J]. Int Met Rev, 1978(2): 74.
2020, Vol. 30 
