Microstructure, mechanical and corrosion properties of electron-beam-melted and plasma-transferred arc-welded WC_P/NiBSi metal matrix composites  

作　　者：Chang Liu Hui Peng Yue Zhao Yuan Yuan Hong-Bo Guo Hui-Bin Xu 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [2]Beijing Key Laboratory for Advanced Functional Material and Thin Film Technology,Beihang University,Beijng 100191,China [3]Key Laboratory of Aerospace Materials&Performance(Ministry of Education),Beihang University,Beijng 100191,China [4]School of Mechanical Materials and Mechatronic Engineering,Faculty of Engineering and Information Sciences,University of Wollongong,Wollongong,NSW 2522,Australia [5]Zhuzhou Seed Cemented Carbide Technology Co.Ltd,Zhuzhou 412000,China

出　　处：《Rare Metals》2019年第9期814-823,共10页稀有金属（英文版）

基　　金：financially supported by the National Basic Research Program of China (No. 2010CB631200);the National Nature Science Foundations of China (Nos. 50771009, 50731001 and 51071013)

摘　　要：As one of the new additive manufacturing processes,electron beam melting(EBM)has seen its promising potential in the fabrication of metal matrix composites(MMCs)components with complex geometries.In this work,WC_P/NiBSi MMCs were fabricated by EBM and plasma-transferred arc welding(PTAW)for a comparative study.The microstructures of both samples were examined using a scanning electron microscope(SEM)equipped with an electron backscattered diffraction(EBSD)detector.The macrohardness was tested using a Rockwell hardness method(Type C),while the microhardness was measured using different loadings(0.5-1.0 N)based on different phases.The anti-abrasion performance was tested as per the ASTM G105 standard.The corrosion behavior of the MMCs was also assessed by potentiodynamic polarization.The results indicate that the EBM bulk and the PTAW cladding MMCs exhibit different microstructures due to the different local solidification conditions.This is believed to lead to the varied mechanical properties and corrosion resistance of the MMCs,and the possible mechanisms were also discussed.As one of the new additive manufacturing processes,electron beam melting(EBM)has seen its promising potential in the fabrication of metal matrix composites(MMCs)components with complex geometries.In this work,WC_P/NiBSi MMCs were fabricated by EBM and plasma-transferred arc welding(PTAW)for a comparative study.The microstructures of both samples were examined using a scanning electron microscope(SEM)equipped with an electron backscattered diffraction(EBSD)detector.The macrohardness was tested using a Rockwell hardness method(Type C),while the microhardness was measured using different loadings(0.5-1.0 N)based on different phases.The anti-abrasion performance was tested as per the ASTM G105 standard.The corrosion behavior of the MMCs was also assessed by potentiodynamic polarization.The results indicate that the EBM bulk and the PTAW cladding MMCs exhibit different microstructures due to the different local solidification conditions.This is believed to lead to the varied mechanical properties and corrosion resistance of the MMCs,and the possible mechanisms were also discussed.

关 键 词：Electron beam MELTING Metal matrix composites MICROSTRUCTURE Carbides Additive manufacturing 

分 类 号：TB333[一般工业技术—材料科学与工程]