Toughening of Fe-based laser-clad alloy coating

被引：34

作者：

Yao, Chengwu ^{[1
,2
]}

Huang, Jian ^{[1
,2
]}

Zhang, Peilei ^{[1
,2
]}

Li, Zhuguo ^{[1
,2
]}

Wu, Yixiong ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2011年 / 257卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Laser cladding; Fe-based coating; Retained austenite; Interdendritic region; CRACKING SUSCEPTIBILITY; TURBINE-BLADES; STRESS-FIELDS; LAYER; MICROSTRUCTURE; TEMPERATURE; INDUSTRY;

D O I：

10.1016/j.apsusc.2010.09.070

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

An investigation is reported on crack-free laser clad Fe-based alloy by use of biaxial powder feeding shielded with argon gas. The microstructure and phase structure of the coating were studied, and mechanical properties were analyzed through hardness, tension strength and wear resistance of the coating. Microstructure analysis showed that there was retained austenite with spherical particles distributed therein in the interdendritic and nearby grain boundary regions. The mechanical test results showed that net-like distributed retained austenite in the interdendritic region had certain toughening effect through blunting crack-tip. Under wear condition of high sliding speed and high loading, the wear resistance of the coating with net-like retained austenite was much higher than that of the coating with some discontinuous carbide network or carbide blocks. The results showed that toughening of laser clad Fe-based alloy with high hardness over 850HV could be achieved by modifying interdendritic phases from net-like carbide to net-like austenite with spherical particles. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：2184 / 2192

页数：9

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