Online study of cracks during laser cladding process based on acoustic emission technique and finite element analysis
Online study of cracks during laser cladding process based on acoustic emission technique and finite element analysis
复制标题
基于声发射技术和有限元分析的激光熔覆过程裂纹在线研究
DOI：
10.1016/j.apsusc.2008.09.039
复制
发表时间：
2008-12
影响因子：
6.7
通讯作者：
Zhang, Dawei
中科院分区：
文献类型：
--
作者：
Zhao, Xingyu;Wang, Fujun;Shen, Yu;Mao, Huaidong;Zhang, Dawei
提出了一种利用声发射技术在线研究激光熔覆过程中裂纹产生和扩展的新方法。利用该方法对5种不同粉末材料激光熔覆过程中的裂纹进行了在线检测。通过有限元分析，得出了裂纹产生和扩展的温度范围。利用光学显微镜和扫描电镜对裂纹的主要形式和扩展形式进行了分析。试验和分析结果表明，裂纹数量随涂层面积、厚度和冷却速度的增加而增加。激光熔覆过程中，大部分裂纹发生在结合区，并沿垂直于激光扫描方向沿着贯穿整个熔覆层，冷却过程中产生的裂纹很少。裂纹主要有四种形式，裂纹扩展形式与涂层和基体的应力状态有关。本文的研究方法和结论为减少大面积激光熔覆过程中的裂纹提供了重要依据。
This paper presents a novel method by using acoustic emission technique to online study of the crack generation and expansion during laser cladding process. The cracks during laser cladding processes with five different laser cladding powder materials were online tested, respectively, with this method. Through finite element analysis (FEA), the temperature ranges of crack generation and expansion were figured out. The main forms and extended forms of the cracks were investigated by using optical microscope and scanning electron microscope (SEM). The experiment and analysis results show that the amount of cracks increases with the area and thickness of coating and the cooling rate increasing. A majority of cracks occur in the bonding zone and extend cross the whole cladding coating along the perpendicular direction of laser scanning during laser cladding, and few cracks generate in the cooling process. There are mainly four kinds of crack forms, and the forms of crack expansion are related to the stress states of coating and substrate. The method and conclusions in this paper provide important information for reducing the cracks during large area laser cladding process.
登录
查看更多内容
影响因子：
4.5
作者：
JASIM, KM;RAWLINGS, RD;WEST, DRF
通讯作者：
WEST, DRF
影响因子：
5.4
作者：
R. Sun;J. Mao;D. Yang
通讯作者：
R. Sun;J. Mao;D. Yang
影响因子：
9.1
作者：
T. Philippidis;T. T. Assimakopoulou-T.
通讯作者：
T. Philippidis;T. T. Assimakopoulou-T.
影响因子：
4.4
作者：
Brothers, A. H.;Prine, D. W.;Dunand, D. C.
通讯作者：
Dunand, D. C.
影响因子：
6
作者：
Nidhi Singh;Gouthama;Vakil Singh
通讯作者：
Nidhi Singh;Gouthama;Vakil Singh