Effect of Ni Content on Microstructure and Hardness of Laser Cladding Layers

doi:10.12068/j.issn.1005-3026.2016.11.007

Abstract

Abstract: To fulfill the demand of surface hardness of remanufacturing various backup rolls， iron based alloy powder mixed with pure nickel powder were cladded on the surface of Cr5 backup steel by laser. The effect of Ni content on microstructure and properties was investigated. The results showed that the microstructure in all laser cladding layers was fishbone-like and net-like dendrites. The alloy composition of the cladding layers could be accurately controlled by the amount of pure nickel powder. With increasing nickel content， the austenite phase in the layer significantly increased， whereas the hardness of the layer drastically decreased. Wear resistance of cladding layer was better than traditional quenching work layer with similar hardness. The hardness of the cladding layer from the powder mixed with 8% pure nickel powder was about 500 HV， which could fulfill the demand of remanufacturing Cr5 backup rolls.

Key words: laser cladding, Ni content, backup roll, microstructure, hardness

CLC Number:

TB31

SUN You-zheng， LIU Shuai， LI Jin-bao， LIU Chang-sheng. Effect of Ni Content on Microstructure and Hardness of Laser Cladding Layers[J]. Journal of Northeastern University Natural Science, 2016, 37(11): 1551-1554.

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