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《Surface Technology》 2013-01
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Effects of Annealing on the Microstructure and Hardness of Laser Cladding FeCoCrNiB High-entropy Alloy Coating

HUANG Zu-feng1,ZHANG Chong1,TANG Qun-hua1,DAI Pin-qiang1,2,WU Bo1(1.College of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China; 2.Department of Materials Science and Engineering,College of Fujian University of Technology,Fuzhou 350108,China)  
FeCoCrNiB high-entropy alloy coating was prepared on the Q235 steel substrate.The coating is free of crack and pore defect,which is composed of rod-like M3B phase and fcc matrix phase.Formation mechanism of the phases was analyzed.Effects of high temperature annealing on microstructure and microhardness were investigated.The results show: after annealed at 900 ℃ and 1000 ℃,some granular and short rod-like M3B phase are precipitated in coating;After annealed at 1150 ℃,rod-like,granular and short rod-like structure disappear,a blocky M3B phase formes,the microhardness of blocly phase is 1188HV;The coating exhibits excellent resistance to high temperature softening,the decrease of microhardness is only about 7% and 9% after annealed at 900 ℃ and 1000 ℃.
【Fund】: 国家自然科学基金资助项目(51171046 50971043);; 福建省自然科学基金资助项目(2012J01202);; 福建省高校产学合作重大项目(2010H60001)
【CateGory Index】: TG174.44
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