Investigation on laser cladding of MoSi_2 powder on steel  

作　　者：Laiqi Zhang Guangnan Chen Zuqing Sun 

机构地区：[1]State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China [2]Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China

出　　处：《Journal of University of Science and Technology Beijing》2005年第5期436-439,共4页北京科技大学学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China (No.59836220), the Major Science Re-search Foundation of the Chinese Academy of Science (No.KY951-Al-601-03), and the Science Research Foundation of the Univer-sity of Science and Technology Beijing (No.20041004790)

摘　　要：The feasibility of the fabrication of coatings for elevated-temperature structural applications by laser cladding MoSi2 pow- der on steel was investigated. A dense and crack-free fine coating, well-bonded with the substrate has been obtained by this technique This coating consists of FeMoSi, Fe2Si and a small amount of MosSi3 due to dilution of the substrate in the coating. The microstructure of the coating is characterized of typical fine dendrites, The dendrites are composed of FeMoSi primary phase, and the interdendritic areas are two eutectic phases of FeMoSi and Fe2Si. The hardness of the coating reaches 845 Hv0.5, 3.7 times larger than that of the steel substrate （180 Hv05）.The feasibility of the fabrication of coatings for elevated-temperature structural applications by laser cladding MoSi2 pow- der on steel was investigated. A dense and crack-free fine coating, well-bonded with the substrate has been obtained by this technique This coating consists of FeMoSi, Fe2Si and a small amount of MosSi3 due to dilution of the substrate in the coating. The microstructure of the coating is characterized of typical fine dendrites, The dendrites are composed of FeMoSi primary phase, and the interdendritic areas are two eutectic phases of FeMoSi and Fe2Si. The hardness of the coating reaches 845 Hv0.5, 3.7 times larger than that of the steel substrate （180 Hv05）.

关 键 词：laser cladding molybdenum silicide powder COATING MICROSTRUCTURE 

分 类 号：TG17[金属学及工艺—金属表面处理]