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The study of microstructure and wear properties of multi-component alloy used in hardfacing technology
|關鍵字:||hardfacing;硬面銲覆;multi-component alloy;abrasive wear;adhesive wear;多元合金;乾砂磨耗;黏著磨耗||出版社:||材料科學與工程學系所||引用:|| X.H. Wang, Z.D. Zou, S.Y. Qu, “Microstructure of Fe-Based Alloy Hardfacing Coating Reinforced by TiC-VC Particles,” Journal of Iron and Steel Research International, Vol.13, No.4, pp.51-55, 2006.  X.H. Wang, F. Han, X.M. Liu, S.Y. Qu, Z.D. Zou, “Effect of molybdenum on the microstructure and wear resistance of Fe-based hardfacing coatings, “Materials Science and Engineering A, Vol.489, No.1-2, pp.193-200, 2008.  K. Gurumoorthy, M. Kamaraj, K.P. Rao, A.S. Rao, S. Venugopal, “ Microstructural aspects of plasma transferred arc surfaced Ni-based hardfacing alloy,” Materials Science and Engineering: A, Vol.456, No.1-2, pp.11-19, 2007.  C.P. Paul, A. Jain, P. Ganesh, J. Negi, A.K. Nath, “Laser rapid manufacturing of Colmonoy-6 components,” Optics and Lasers in Engineering, Vol.44, No.10, pp.1096-1109,2006.  M.X. Yao, J.B.C. Wu, Y. 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The study investigated the effect of different Mo content on FeCoCrNi alloy cladding and the effect of different Si content on FeCoCrNiMoAl alloy cladding. A surface of composite cladding reinforced by a multi-component alloy filler on low-carbon steel was prepared. A Gas tungsten arc welding (GTAW) heat source was used for this task under a nonoxidizing atmosphere protected by argon gas flow to formed the multi-component alloy claddings. The purpose of the study is to discussed systematically the microstructure, mechanical properties, and wear mechanism of claddings.
The results indicated the FeCoCrNi based cladding contained a FCC phase. At low Mo content, the structure of claddings still contained a FCC phase. At high Mo content, the structure of claddings contained a FCC+σ phase. The microhardness of FeCoCrNiMo1.0 is 2.1 times than FeCoCrNi, and the abrasive wear lost is improved form 0.9 to0.6(mg/mm2). The CrNiO4 and NiCr2O4 oxidations were formed in FeCoCrNiMo0.2 and CoCrNiMo1.0 claddings, respectively.The adhesive wear resistance of FeCoCrNiMo1.0 cladding is 9.3 times than FeCoCrNi cladding due to the different wear mechanism. The mechanism of FeCoCrNi cladding is sever plastic deformation and of FeCoCrNiMo1.0 is mild oxidation mechanism. The TEM analysis can observed the formation of dislocation cells, lamellar microband, nano elongated grains and nano equiaxed grains as increasing wear strain.
The addition of Al in FeCoCrNiMo1.0 cladding changed the microstructure from FCC+σ to BCC+σ phase, and the addition of Si in FeCoCrNiMoAl cladding changed the microstructure from BCC+σ to BCC+FeMoSi silicide. When the silicides was in branch dendrite, it can not resist the abrasion wear from dry sand and easily caused sever plastic deformation with BCC interdendrite to fracture. When the silicide was in radiated dendrites, it can resist the abrasion form dry sand and caused slight plastic deformation in surface. Even cracks formed in radiated dendrite but the BCC interdendrite with modulated plates restrained the cracks propagated, this intention made the cladding has higher abrasive wear resistance. The FeAlO3 oxidation was observed in local BCC interdendrite region but no oxidation formed in silicide dendrite.
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