Investigation on cored-eutectic structure in Ni60/WC composite coatings fabricated by wide-band laser cladding

被引：89
作者：
Ma Qunshuang [1 ]
Li Yajiang [1 ]
Wang Juan [1 ]
Liu Kun [1 ]
机构：
[1] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 645卷
关键词：
Laser cladding; Composite coating; Cored-eutectic; Microstructure; WC PARTICLES; MICROSTRUCTURE CHARACTERISTICS; NI-WC; ALLOY; WEAR; CORROSION; BEHAVIOR; STEEL; EVOLUTION; TITANIUM;
D O I：
10.1016/j.jallcom.2015.04.136
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：
Ni60 composite coatings reinforced with WC particles were fabricated on the surface of Q550 steel using LDF4000-100 fiber laser device. The wide-band laser and circular beam laser used in laser cladding were obtained by optical lens. Microstructure, elemental distribution, phase constitution and wear properties of different composite coatings were investigated. The results showed that WC particles were partly dissolved under the effect of wide-band fiber laser irradiation. A special cored-eutectic structure was synthesized due to dissolution of WC particles. According to EDS and XRD results, the inside cores were confirmed as carbides of M23C6 enriched in Cr, W and Fe. These complex carbides were primarily separated out in the molten metal when solidification started. Eutectic structure composed of M23C6 carbides and gamma-Ni(Fe) grew around carbides when cooling. Element content of Cr and W is lower at the bottom of cladding layer. In consequence, the eutectic structure formed in this region did not have inside carbides. The coatings made by circular laser beam were composed of dendritic matrix and interdendritic eutectic carbides, lacking of block carbides. Compared to coatings made by circular laser spot, the cored-eutectic structure formed in wide-band coatings had advantages of well-distribution and tight binding with matrix. The uniform power density and energy distribution and the weak liquid convection in molten pool lead to the unique microstructure evolution in composite coatings made by wide-band laser. Experiment results indicated the wear resistance and microhardness of composite coatings were both significantly improved. (C) 2015 Elsevier B.V. All rights reserved.
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收藏
页码：151 / 157
页数：7
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