Wear Resistance of Deposited Layer Using Nickel-Based Composite Powders by Plasma-Arc Surfacing

DU Ze-yu¹，XU Bin-shi²，DONG Li-hong²，ZHU Sheng²

(1.College of Material Science and Engineering , Tianjin University,Tianjin 300072, P. R. China;
2.National Key Laboratory for Remanufacturing , Armored Force Engineering Institute, Beijng 100072;
3.Basic Department, Ordnance Engineering College, Shijiazhuang 050003)

摘要:Nickel-based composite alloy powders were deposited on the surface of Q235 steel by plasma-arc surfacing in this work. Optimal proportions of elements intensifying the composite powders were ascertained by orthogonal design of three factors and three levels and orthogonal polynomial regression analysis , which Cr , Mn , W were 10% ,4% and 7 % respectively.Phase and structure of deposited materials were characterized by optical microscope and X- ray diffraction. Hardness tests and wear resistance tests were carried out to determine the performance of the deposited layers. The results show that the microstructure of deposited layers of composite powders mainly consist of γ-( Ni, Fe ) , γ- Ni, WC, W2 C, Mn31Si12, Cr23 C6,Cr7 C3, Cr, NiB, Ni2B etc. Wear resistance and hardness of the surface increased evidently.

关键词:plasma- arc surfacing; nickel- based composite powder; microstructure; hardness; wear resistance;

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