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Affiliation of Author(s):材料科学与技术学院

Title of Paper:Microstructure and phase transformations of Fe-Ni-Cr mixed powder by laser cladding on Q235 mild steel

Journal:PROCEEDINGS OF 2018 15TH INTERNATIONAL BHURBAN CONFERENCE ON APPLIED SCIENCES AND TECHNOLOGY (IBCAST)

Key Words:Q235 mild steel laser cladding coating microhardness wear resistance corrosion resistance

Abstract:The coatings were fabricated by laser cladding with Fe-Ni-Cr mixed powder on Q235 mild steel. The morphology of cross-section, microstructure, phase, microhardness, wear and corrosion resistance of the coating were investigated by optical microscope ( OM), scanning electron microscope (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), Vickers microhardness tester, dry sliding wear testing machine and electrochemical workstation, respectively. Results showed that the metal powder formed good coating without defects such as cracks and pores and the original austenite in substrate transformed into martensite. The phases of coating were solid solution Ni-Cr-Fe and (alpha-Fe,Ni). The microstrucure of upside, center and bottom of coating were fine equiaxed grains, bulky equiaxed grains and coarse cylindrical crystals, respectively. The cladding coating acquired good wear resistance with the maximum hardness of 578.5 HV0.1 and the mean friction coefficient of the substrate is approximately 2 times that of the coating. The corrosion resisting property of cladding is far better than that of substrate by about 9 times.

ISSN No.:2151-1403

Translation or Not:no

Date of Publication:2018-01-01

Co-author:Han, Tengfei,FENG Xiaomei

Correspondence Author:SHEN Yifu