电焊机2025，Vol.55Issue(5)：37-47,11.DOI:10.7512/j.issn.1001-2303.2025.05.05
G20Mn5QT铸钢激光熔覆工艺与组织性能研究
Study on Microstructure and Properties of G20Mn5QT Cast Steel by Laser Cladding
陈书翔 1武永寿 1管益辉 1赵永胜 2刘艳 2韩晓辉1
作者信息
- 1. 中车青岛四方机车车辆股份有限公司,山东 青岛 266111
- 2. 西南交通大学 材料科学与工程学院,四川 成都 610031
- 折叠
摘要
Abstract
G20mn5QT cast steel has excellent mechanical properties and is applied to key components of railway vehicles.However,during service,G20Mn5QT cast steel component may suffer from wear and corrosion due to high-frequency vibra-tion contact,leading to their scrapping.Laser cladding has the advantages of high energy density,low dilution rate,good in-terface bonding and small deformation.In order to reduce the cost,the laser cladding repair technology was used to repair the defects of G20Mn5QT cast steel parts with 316L stainless steel powder to improve the present situation of replacement repair.It is found that the melting width and dilution rate of the single-pass laser cladding sample increase with the increase of laser power,but the melting height and the melting width decrease with the increase of scanning speed,The dilution rate has no obvious rule,the melting height increases with the increase of powder feeding rate,while the melting width and dilu-tion rate decrease with the increase of powder feeding rate.The cladding layer is mainly composed of planar,cellular,colum-nar and equiaxed grains.The hardness,wear resistance,tensile strength,impact toughness and shear strength of the cladding layer are close to or better than those of the matrix under appropriate technological parameters.it also shows that 316L stain-less steel powder can meet the repair requirements of G20Mn5QT steel.关键词
G20Mn5QT铸钢/激光熔覆修复/微观组织/力学性能Key words
G20Mn5QT cast steel/repair by laser cladding/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
陈书翔,武永寿,管益辉,赵永胜,刘艳,韩晓辉..G20Mn5QT铸钢激光熔覆工艺与组织性能研究[J].电焊机,2025,55(5):37-47,11.
