Dual-Material Electron Beam Selective Melting:Hardware Development and Validation Studies  

作　　者：Chao Guo Wenjun Ge Feng Lin 

机构地区：[1]Department of Mechanical Engineering,Tsinghua University [2]Key Laboratory for Advanced Materials Processing Technology (Ministry of Education of China),Tsinghua University [3]Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing,Tsinghua University

出　　处：《Engineering》2015年第1期124-130,共7页工程（英文）

基　　金：funding of 2013 Beijing Science and Technology Development Project (D13110400300000 and D131100003013002)

摘　　要：Electron beam selective melting （EBSM） is an additive manufacturing technique that directly fabricates three-dimensional parts in a layerwise fashion by using an electron beam to scan and melt metal powder. In recent years, EBSM has been successfully used in the additive manufacturing of a variety of materials. Previous research focused on the EBSM process of a single material. In this study, a novel EBSM process capable of building a gradient structure with dual metal materials was developed, and a powder-supplying method based on vibration was put forward. Two different powders can be supplied individually and then mixed. Two materials were used in this study： Ti6AI4V powder and Ti47AI2Cr2Nb powder. Ti6AI4V has excellent strength and plasticity at room temperature, while Ti47AI2Cr2Nb has excellent performance at high temperature, but is very brittle. A Ti6AI4V/Ti47AI2Cr2Nb gradient material was successfully fabricated by the developed system. The microstructures and chemical compositions were characterized by optical microscopy, scanning microscopy, and electron microprobe analysis. Results showed that the interface thickness was about 300 μm. The interface was free of cracks, and the chemical compositions exhibited a staircase-like change within the interface.Electron beam selective melting(EBSM) is an additive manufacturing technique that directly fabricates three-dimensional parts in a layerwise fashion by using an electron beam to scan and melt metal powder. In recent years, EBSM has been successfully used in the additive manufacturing of a variety of materials. Previous research focused on the EBSM process of a single material. In this study, a novel EBSM process capable of building a gradient structure with dual metal materials was developed, and a powder-supplying method based on vibration was put forward. Two different powders can be supplied individually and then mixed. Two materials were used in this study: Ti6Al4 V powder and Ti47Al2Cr2 Nb powder. Ti6Al4 V has excellent strength and plasticity at room temperature, while Ti47Al2Cr2 Nb has excellent performance at high temperature, but is very brittle. A Ti6Al4V/Ti47Al2Cr2 Nb gradient material was successfully fabricated by the developed system. The microstructures and chemical compositions were characterized by optical microscopy, scanning microscopy, and electron microprobe analysis. Results showed that the interface thickness was about 300 μm. The interface was free of cracks, and the chemical compositions exhibited a staircase-like change within the interface.

关 键 词：additive manufacturing electron beam selectivemelting gradient materials titanium alloy TiAI alloy 

分 类 号：TQ171.622[化学工程—玻璃工业] TG456.3[化学工程—硅酸盐工业]