电焊机2024，Vol.54Issue(7)：68-75,8.DOI:10.7512/j.issn.1001-2303.2024.07.10
窄孔内壁激光金属沉积Stellite6合金耐磨层组织及性能研究
Study on Microstructure and Properties of Stellite6 Alloy Wear-resistant Layer on the Inner Wall of Narrow Holes by Laser Metal Deposition
王红顺 1张峰 2黄兆亮 1王艳 1庞义斌 2周智文 2高俊杰2
作者信息
- 1. 国家管网集团北方管道有限责任公司 压缩机组维检修中心,河北 廊坊 065000
- 2. 航发优材(镇江)增材制造有限公司,江苏 镇江 212132
- 折叠
摘要
Abstract
To solve the poor accessibility of narrow hole inner wall surfacing and enhance the wear resistance of 304L stain-less steel,a layer of stellite 6 wear-resistant coating with a thickness of approximately 2.5 mm,density of 99.9981%,and free of cracks and unfused defects was deposited on the inner wall of a 304L narrow hole with a depth of 30 mm and diam-eter of 14 mm using laser metal deposition.The microstructure,phase composition,hardness distribution,and wear resis-tance of the wear-resistant layer were systematically investigated through micro-nano CT,XRD,metallographic examina-tion,hardness testing,and friction wear testing.The results revealed that the stellite 6 wear-resistant layer was dense and defect-free,with its microstructure transitioning from planar crystals at the bottom to cellular crystals,dendrites,and equiaxed crystals at the top.The phase composition mainly consists of γ-Co,M23C6,CoCx,and(Cr,Fe)7C3,etc.Various ele-ments are evenly distributed near the fusion line,with no significant aggregation.The average microhardness of the wear-resistant layer is 2.38 times that of the 304L matrix,and the microhardness values at different heights of the narrow hole are relatively stable.The wear rate of the wear-resistant layer is 29.3%lower than that of the 304L matrix,indicating excellent wear resistance.This study provides a basis for the application of laser metal deposition wear-resistant coatings on large depth-width ratio inner hole walls in industries such as nuclear power and energy.关键词
激光金属沉积/窄孔内壁/Stellite6合金/组织性能/耐磨层Key words
laser metal deposition/narrow hole inner wall/Stellite6 alloy/microstructure and properties/wear-resistant layer分类
矿业与冶金引用本文复制引用
王红顺,张峰,黄兆亮,王艳,庞义斌,周智文,高俊杰..窄孔内壁激光金属沉积Stellite6合金耐磨层组织及性能研究[J].电焊机,2024,54(7):68-75,8.
