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Study on Mechanical Properties and Microstructure of 40Cr Repaired by Laser Cladding Fe901 under Different Atmospheres

Zhang Wenlong;Zhang Anfeng;Qi Baolu;Li Shuai;Zhang Lianzhong;Li Dichen;State Key Laboratory for Manufacturing System Engineering,Rapid Manufacturing National Engineering Research Center,The High-end Manufacturing Equipment Collaborative Innovation Research Center,Xi′an Jiaotong University;  
Experiments for repairing 40 Cr by laser cladding Fe901 under the different atmospheres.The influence of different atmospheres on the repairing is discussed in terms of microstructure,elements analysis and mechanical properties,intending to investigate the feasibility of replacing Ar with N2 in laser cladding repair in the wild environment. The results show that the microstructure of cladding layers under different atmospheres,are composites of dendritic crystals and equiaxed crystals. The contents of N and O in the cladding layers under different atmospheres differ little,or no increase more accurately,compared with that of Fe901 powder. The tensile strength and ductility of samples repaired under different atmospheres differs slightly,among which the tensile strength all reach to 92.5 % of the substrate,and the ductility surpasses 4 %. The atmosphere influences slightly on the microstructure and properties of 40 Cr repaired by laser cladding Fe901,which means that replacing Ar with N2 can totally satisfy the requirement of the emergency repairing in the wild environment.
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