Sliding wear of medium-carbon bainitic/martensitic/austenitic steel treated by short-term low-temperature austempering

doi:10.1016/j.wear.2021.203732

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	Sliding wear of medium-carbon bainitic/martensitic/austenitic steel treated by short-term low-temperature austempering
	Luo, Quanshun 3; Li, Jianbin 4; Yan, Qintai 4; Li, Wenbo 5; Gao, Yubi 1; Kitchen, Matthew 3; Bowen, Leon 2; Farmilo, Nicholas 3; Ding, Yutian 1
刊名	WEAR
	2021-07-15
卷号	476
关键词	Nano-bainitic steel Sliding wear Short-term austempering Cross-sectional TEM
ISSN号	0043-1648
DOI	10.1016/j.wear.2021.203732
英文摘要	A medium-carbon Si-Mn-Ni-Cr-Mo alloyed (300M) steel was austempered for various short periods at its martensite-starting temperature of 285 degrees C to seek improved sliding wear resistance as compared to the traditional martensitic and bainitic steels. Reciprocating sliding wear tests were performed against a WC/Co ball counterpart at a constant load of 49 N. The samples were characterised using field emission SEM, XRD and hardness testing. The associated wear mechanisms were analysed using SEM and cross-sectional TEM. The results revealed that a short austempering time of 6 min produced refined arrays of initial nano-bainitic ferrite laths and inter-lath filmy austenite and the majority martensite and retained austenite, while the majority of the microstructure remained martensitic with retained austenite. The hardness was unchanged to that of the as-quenched martensite of 6.4 GPa. Simultaneously the wear coefficient decreased by 41% from 2.67 to 1.58 x 10-15 m3N-1m1, which is also superior to both the tempered martensite at 1.65 x 10-15 m3N-1m-1 and the lower bainite at 1.87 x 10-15 m3N-1m-1. Increasing the austempering time to 20 and 60 min resulted in wear coefficients of 1.38 and 2.18 x 10-15 m3N-1m-1, respectively. The improved wear resistance has been explained by the wear induced microstructure evolution, especially the carbon partitioning induced stabilisation of retained austenite. The highstress sliding wear was found to be dominated by severe shear deformation, which resulted in a nano-laminate structured top layer. Delamination wear was found to take place within the embrittled nano-laminates.
WOS研究方向	Engineering ; Materials Science
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000679095200002
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148513]
专题	省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China; 2.Univ Durham, Dept Phys, Durham DH1 3LE, England 3.Sheffield Hallam Univ, Mat & Engn Res Inst, Sheffield, S Yorkshire, England; 4.China Railway High Tech Ind Corp Ltd, Beijing, Peoples R China; 5.China Railway Baoji Bridge Grp Co Ltd, Baoji, Shaanxi, Peoples R China;
推荐引用方式 GB/T 7714	Luo, Quanshun,Li, Jianbin,Yan, Qintai,et al. Sliding wear of medium-carbon bainitic/martensitic/austenitic steel treated by short-term low-temperature austempering[J]. WEAR,2021,476.
APA	Luo, Quanshun.,Li, Jianbin.,Yan, Qintai.,Li, Wenbo.,Gao, Yubi.,...&Ding, Yutian.(2021).Sliding wear of medium-carbon bainitic/martensitic/austenitic steel treated by short-term low-temperature austempering.WEAR,476.
MLA	Luo, Quanshun,et al."Sliding wear of medium-carbon bainitic/martensitic/austenitic steel treated by short-term low-temperature austempering".WEAR 476(2021).