Effects of thermal plasma surface hardening on wear and damage properties of rail steel

被引：25

作者：

Xiang, Yong ^{[1
]}

Yu, Deping ^{[1
]}

Cao, Xiuquan ^{[1
]}

Liu, Yang ^{[1
]}

Yao, Jin ^{[1
]}

机构：

[1] Sichuan Univ, Sch Mfg Sci & Engn, Chengdu 610065, Sichuan, Peoples R China

来源：

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY | 2018年 / 232卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Thermal plasma; surface hardening; wear resistance; surface damage; rail steel; WHEEL/RAIL MATERIALS; LASER; PERFORMANCE; RESISTANCE; ALLOY;

D O I：

10.1177/1350650117729073

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The aim of this study is to investigate the effects of thermal plasma surface hardening on wear and damage properties of rail steel. Wear tests of the rail steel treated by thermal plasma jet and untreated one were carried out on a block-on-ring wear test machine. Their corresponding wear and damage properties were contrasted. Results indicate that the microstructure of the heat-affected zone of the rail steel treated by thermal plasma surface hardening was transformed. It mainly consists of lath and acicular martensite and also small amount of sorbite, bainite, and retained austenite. As a result, the thermal plasma surface hardening effectively improves the wear resistance of the rail steel. The main wear mechanism of the treated rail steel is mild plowing wear, while that of the untreated rail steel is a combination of severe plowing wear and adhesion wear. Therefore, it is verified that thermal plasma surface hardening is effective in improving the wear resistance, alleviating the surface damage and thus prolonging the service life of the rail steel.

引用

页码：787 / 796

页数：10

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