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杨立军,代文豪,党新安.氧乙炔喷焊NiCrBSi-WC涂层激光改性组织及性能影响[J].稀有金属材料与工程(英文),2018,47(1):351~356.[Yang Lijun,Dai Wenhao and Dang Xin’an.Effect of Laser Modification on Microstructure and Properties of NiCrBSi-WC Coating by Oxygen Acetylene Spray Welding[J].Rare Metal Materials and Engineering,2018,47(1):351~356.]
Effect of Laser Modification on Microstructure and Properties of NiCrBSi-WC Coating by Oxygen Acetylene Spray Welding
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Received:November 24, 2015  Revised:May 15, 2016
DOI:
Key words: thermal spray welding  Ni-based WC  laser modification  borosiliconizing  wear resistance
Foundation item:国家自然科学基金资助(项目号50972086)
Author NameAffiliation
Yang Lijun,Dai Wenhao and Dang Xin’an  
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Abstract:
      Preparation of NiCrBSi-WC coating on Q235 steel was using the oxygen acetylene flame spray welding and use solid borosiliconizing method to modify the surface of the spray welding layer was modified by laser. The microstructure, phase structure and microhardness of the coatings were analyzed by SEM, XRD, EDS and microhardness tester and the wear resistance of the coating before and after treatment by using the friction and wear testing machine. The results show that the surface of the spray welding layer under the laser scanning process become smooth and dense. The main phase Ni2.9Cr0.7Fe0.36 and FeNi3 components of the coating were not changed, but the main phase in the arrangement of crystal plane with the preferred orientation and the crystallinity increased. The WC part is decomposed into W2C, W and C. And C was dissolved into the Ni based and increased Cr3C2 and other carbides, and the wear resistance of the coating was improved. The hardened layer depth is 0.25mm and its microhardness increased to 909HV. On the basis of the laser remelted coating, boronsiliconizing can increase Ni3B, Ni2B, NiSi etc. boride and silicide hard phase, the average coefficient of friction decreased from 0.583 to 0.428, wear resistance than laser treatment increased nearly doubled.