Effect of defocus manner on laser cladding of Fe-based alloy powder

被引：45
|
作者：
Gao, Wenyan [1 ]
Zhao, Shusen [1 ]
Liu, Falan [1 ]
Wang, Yibo [1 ]
Zhou, Chunyang [1 ]
Lin, Xuechun [1 ]
机构：
[1] Chinese Acad Sci, Inst Semicond, Lab All Solid State Source, Beijing 100083, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2014年 / 248卷
基金：
中国国家自然科学基金;
关键词：
Laser cladding; Negative defocus; Minimal dilution; Cladding pores; Microhardness; MICROSTRUCTURE; RESISTANCE;
D O I：
10.1016/j.surfcoat.2014.03.019
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This investigation was focused on the influences of defocus manner and composite powders on laser cladding. Combining with the transmission characteristic of parallel Gaussian laser beam through a focusing lens, the energy distribution of the cross section of the laser beam in positive and negative defocused zone was analyzed and also verified by laser dotting ablation. Comparing with positive defocus, the negative defocus is an effective way for high quality laser cladding providing more advantages. Therefore, the negative defocus method is selected to solve the problem of high dilution rate and pores in the overlapping coating. The study showed that by adjusting the process parameters, a coating with low dilution and free of pores can be achieved easily in the negative defocus. Finally, the microstructure and microhardness of Fe-based alloy mixed with 5 wt% Cr3C2 coating were analyzed. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：54 / 62
页数：9
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