Effect of carbon content on the microstructure and the crackina susceptibility of Fe-based laser-clad layer

被引:52
作者
Li, S [1 ]
Hu, QW [1 ]
Zeng, XY [1 ]
Ji, SQ [1 ]
机构
[1] Huazhong Univ Sci & Technol, State Key Lab Laser Technol, Wuhan 430074, Peoples R China
关键词
laser cladding; Fe-based alloy; carbon content; cracking susceptibility; peritectic;
D O I
10.1016/j.apsusc.2004.06.098
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
The laser cladding of Fe-based alloys on a medium carbon steel substrate was performed using a CO2 laser and Ar shielding gas that was blown into a molten pool. The rmcrostructure and cracking susceptibility of the laser-clad layers, were studied in terms of carbon additions. Results show that the small change of the carbon content in the alloy powders can obviously change the microstructure and properties of the layers. When the carbon content is in the range of 0.3-0.4 wt.%. the decrease of the carbon content in alloy powders will increase the hardness and toughness of the layers simultaneously under the same process parameters. As a result, crack-free coatings with high hardness can be obtained. As the carbon content increases from 0.2 wt.%, to 0.4 wt.%, the segregation ratio of chromium increases, while the segregation ratios of nickel. manganese. and silicon first decrease and then increase. At the same time, a new designing principle concerning the composition and microstructure has been put forward, and the principal mechanisms of strengthening and toughening of the layers are fine-grain strengthening and low carbon martensitic phase transformation strengthening (C) 2004 Elsevier BX All rights reserved.
引用
收藏
页码:63 / 70
页数:8
相关论文
共 18 条
[11]   Hall-Petch relationship in friction stir welds of equal channel angular-pressed aluminium alloys [J].
Sato, YS ;
Urata, M ;
Kokawa, H ;
Ikeda, K .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 354 (1-2) :298-305
[12]  
SINGH J, 1987, METALL TRANS A, V18, P313, DOI 10.1007/BF02825712
[13]  
Song WL, 2001, SURF COAT TECH, V138, P291, DOI 10.1016/S0257-8972(00)01168-3
[14]  
Song WL, 1996, SURF COAT TECH, V80, P279, DOI 10.1016/0257-8972(95)02470-0
[15]  
SONG WL, 1996, THESIS HUAZHONG U SC, P17
[16]   Cracking susceptibility of a laser-clad layer as related to the melting properties of the cladding alloy [J].
Wulin, S ;
Beidi, Z ;
Changsheng, X ;
Wei, H ;
Kun, C .
SURFACE & COATINGS TECHNOLOGY, 1999, 115 (2-3) :270-272
[17]   Microstructure characteristics of ZrC-reinforced composite coating produced by laser cladding [J].
Zhang, QM ;
He, JJ ;
Liu, WJ ;
Zhong, ML .
SURFACE & COATINGS TECHNOLOGY, 2003, 162 (2-3) :140-146
[18]  
ZHAO HY, 2001, THESIS CHINESE ACAD, P35