Effect of strong carbide forming elements in hardfacing weld metal  

作　　者：YuanbinZhang DengyiRen 

机构地区：[1]DepartmentofMaterialsandEngineering,ShandongInstituteofArchitectureofEngineering,Jinan250014,China [2]DepartmentofMaterialScienceandEngineering,ShandongUniversity,Jinan250061,China

出　　处：《Journal of University of Science and Technology Beijing》2004年第1期71-74,共4页北京科技大学学报（英文版）

基　　金：This work was financially supported by Nature Science Foundation of Shandong Province (No.Y99F01).

摘　　要：To achieve high carbon hard-facing weld metals with both high hardness andcrack resistance, strong carbide forming elements Ti, Nb and V were alloyed into the weld metals,and their effect on the formation of carbides and the matrix microstructure were studied. ElectronProbe Microanalysis (EPMA), Energy Dispersive Spectroscopy(EDS) and Transmission ElectronMicros-copy(TEM) were adopted to investigate the microstructure, then thermodynamics of theformation of carbides was calculated and their effect on the matrix was further discussed. It isrevealed that Nb, Ti and V influence strongly the distribution and existing state of carbon,inducing precipitation of carbides accompanying with the depletion of carbon in matrix. But whenonly V are alloyed as carbide forming element, the carbides are scarce and distributed along grainboundaries, and the hard-facing alloy is too hard, while the using of only Nb or Ti could notreinforce the weld metals effectively. The hard-facing alloy reinforced with Nb, V and Ti can formdispersive fine carbides and low carbon martensite matrix.To achieve high carbon hard-facing weld metals with both high hardness andcrack resistance, strong carbide forming elements Ti, Nb and V were alloyed into the weld metals,and their effect on the formation of carbides and the matrix microstructure were studied. ElectronProbe Microanalysis (EPMA), Energy Dispersive Spectroscopy(EDS) and Transmission ElectronMicros-copy(TEM) were adopted to investigate the microstructure, then thermodynamics of theformation of carbides was calculated and their effect on the matrix was further discussed. It isrevealed that Nb, Ti and V influence strongly the distribution and existing state of carbon,inducing precipitation of carbides accompanying with the depletion of carbon in matrix. But whenonly V are alloyed as carbide forming element, the carbides are scarce and distributed along grainboundaries, and the hard-facing alloy is too hard, while the using of only Nb or Ti could notreinforce the weld metals effectively. The hard-facing alloy reinforced with Nb, V and Ti can formdispersive fine carbides and low carbon martensite matrix.

关 键 词：hard-facing welding carbides niobium (Nb) vanadium (V) titanium (Ti) 

分 类 号：TG135.5[一般工业技术—材料科学与工程]