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

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 micro-structure of deposited layers of composite powders mainly consist of γ -( Ni, Fe) , γ -Ni, WC, W_2C, Mn31Si12, Cr_(23) C_6, Cr_7C_3, Cr,NiB,Ni_2B etc. Wear resistance and hardness of the surface increased evidently.