Effect of Heat Treatment on Erosive Properties of Ni-Ti Coating Prepared by Arc Spraying
Ni-Ti coating was fabricated on 2Cr13 martensitic stainless steel substrate by arc spraying protected in argon atmosphere,then,different heat treatment processes were conducted.The erosive resistance of Ni-Ti coating after heat treatment was evaluated by erosion experiment tester.The microstructure and erosion surface morphology of the coating were characterized by SEM;the phase composition of the coating was analyzed by XRD;the micro-hardness values of the Ni-Ti coating were measured.The results indicate that: clear link between erosive properties and microhardness of Ni-Ti coating can't be confirmed;the phase composition,microstructure,interlayer bonding force and the superelasticity property of NiTi(B2) play an important role in erosion resistance of Ni-Ti coating;more pores and crack appear significantly after high temperature heat treatment(1050℃),the erosion-resistance of the coating decreases.