焊管2024，Vol.47Issue(2)：45-49,5.DOI:10.19291/j.cnki.1001-3938.2024.02.007
线光斑激光熔覆Ni-Al金属间化合物工艺及组织研究
Study on Process and Microstructure of Ni-Al Intermetallic Compound by Line Spot Laser Cladding
摘要
Abstract
In order to improve the high-temperature oxidation resistance of P92 steel,laser cladding of Ni-Al intermetallic compounds on the surface of P92 steel substrate was carried out using a line beam spot.The cladding process parameters were screened,and the microstructure and composition of the samples were analyzed.The results showed that under the selected cladding process,no cracks were found at the microstructure of the cladding layer,and there was no tendency for cracking.At the same time,the melting of P92 steel matrix is less,and the Fe element in the matrix diffuses to the top less than 5%.Ni3Al and NiAl are the main phases in the cladding layer.The microstructure from the top of the cladding layer to the matrix part changes from equiaxed crystal to dendrite,columnar crystal and plane crystal.When the laser power is 1 800 W,the scanning speed is 2 m/min,the powder feeding speed is 17 r/min,and the powder feeding gas flow rate is 8 L/min,the matrix melting and Fe element diffusion can be reduced.It provides a way to solve the problem of cracking of Ni-Al intermetallic compound cladding layer and Fe element diffusion in steel matrix during laser cladding.关键词
线光斑/激光熔覆/裂纹/Fe元素扩散Key words
line spot/laser cladding/crack/Fe element diffusion分类
矿业与冶金引用本文复制引用
李林森,王轲岩,余超峰,殷咸青..线光斑激光熔覆Ni-Al金属间化合物工艺及组织研究[J].焊管,2024,47(2):45-49,5.基金项目
国家重点研发计划项目2.4"替代电镀铬的绿色表面处理技术"(项目编号2018YFB2002000) （项目编号2018YFB2002000）
国家重点研发计划项目3.6"海洋装备水下原位高效增材修复技术与装备"(项目编号2022YFB4601803). （项目编号2022YFB4601803）
