Microstructural characteristics of laser clad coatings with rare earth metal elements

被引：91
|
作者：
Wang, KL [1 ]
Zhang, QB [1 ]
Sun, ML [1 ]
Wei, XG [1 ]
机构：
[1] Tsing Hua Univ, Dept Mech Engn, Beijing 100084, Peoples R China
来源：
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2003年 / 139卷 / 1-3期
关键词：
laser cladding; rare earth elements; microstructure;
D O I：
10.1016/S0924-0136(03)00551-X
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructural characteristics of laser clad nickel-based alloy coatings with rare earth (RE) oxide CeO2 or La2O3 were investigated. Nickel-based alloy powder with different contents of CeO2 or La2O3 was laser clad onto a steel substrate. The clad coatings were examined and tested for microstructural features, chemical compositions and phase structure of the clad coatings. A scanning electron microscope (SEM) equipped with energy dispersive analysis X-rays (EDAX) was employed to observe the microstructure and analyze the chemical compositions of the clad coatings. The percentage of inclusion in the coatings was quantified by an image analysis system. The crystallographic phase formed during laser cladding was characterized by an X-ray diffractometer. The results were compared with coatings without CeO2 and La2O3. The comparison indicated that additions of RE oxide CeO2 or La2O3 can refine and purify the microstructure of coatings, and reduce the dilution of clad material from the substrate. Moreover, the addition of RE oxide can form some new hard crystallographic phase in the coatings. The mechanism of these effects is also discussed in this paper. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：448 / 452
页数：5
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