Thermal Fatigue Behaviour of Co-Based Alloy Coating Obtained by Laser Surface Melt-Casting on High Temperature Alloy

被引：0
|
作者：
ZHU Wei-dong [1 ]
LIU Qi-bin [1 ]
机构：
[1] Guizhou University of Technology
来源：
Journal of Iron and Steel Research(International) | 2000年 / 7卷 / 01期
关键词：
laser melt-casting; Co-based alloy; coating; thermal cycling; residual stress; corrosion pit;
D O I：
10.13228/j.boyuan.issn1006-706x.2000.01.064
中图分类号：
TG174.4 [金属表面防护技术];
学科分类号：
080503 ;
摘要：
A thermal fatigue behaviour of Co-based alloy coating obtained by laser surface meltcasting on the high temperature alloy GH33 was studied.The results show that after each time of thermal cycling,the final residual stress was formed in the melt-casting layer which is attributed to the thermal stress and structural stress.Through the first 50 times of thermal cycling,the morphology of coating still inherits the laser casting one,but the dendrites get bigger;After the second 50 times of thermal cycling,corrosion pits emerge from coating,and mostly in the places where coating and substrate meet.The fatigue damage type of coating belongs to stress corrosion.
引用
收藏
页码：39 / 42
页数：4
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