High-temperature wear property of high chrome steel by laser surface melting

被引：0
|
作者：
Li M. [1 ]
Wang Y. [1 ]
Han B. [1 ]
Cheng Y. [1 ]
机构：
[1] College of Mechanical and Electronic Engineering, China University of Petroleum, Dongying
来源：
Zhongguo Jiguang/Chinese Journal of Lasers | 2010年 / 37卷 / 01期
关键词：
High chrome steel; High-temperature wear; Laser surface melting; Laser technique; Protective oxide layer;
D O I：
10.3788/CJL20103701.0302
中图分类号：
学科分类号：
摘要：
Wear morphology, chemical composition of the worn surfaces as well as the phase constitution and morphology of oxide scales at 560, 650 and 800 °C were analyzed by SEM, EDS and XRD, and wear mechanisms at different temperatures were explored. The results show that during laser surface melting the brittle carbides are completely dissolved, and homogenous austenitic dendrite and fine M23C6 interdendritic carbides are formed in laser melted zone. At 560 °C wear mechanism of the as-received steel is abrasive wear, while grooves and carbide particles appear on the worn surface. The wear mechanism of laser melted steel is mainly abrasive wear along with slight sticking, the weight loss of which is significantly lower than that of untreated steel at 560 °C. At 650 °C the weight of high chrome steel gains due to severe sticking, while the reduction of sticking in laser melted steel is attributed to the solid lubricity of the oxide protective layer formed on the worn surface due to even oxidation by way of tribochemical reactions. The weight of the as-received and laser melted samples increases at 800 °C resulted from sticking, while the weight gain of laser melted steel is less.
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页码：302 / 306
页数：4
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