Freeform fabrication of titanium metal and intermetallic alloys by three-dimensional micro welding
Freeform fabrication of titanium metal and intermetallic alloys by three-dimensional micro welding
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DOI：
10.1016/j.matdes.2006.05.024
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发表时间：
2007-01-01
影响因子：
8.4
通讯作者：
Kudoh, M.
中科院分区：
文献类型：
--
作者：
Katou, M.;Oh, Janghwan;Kudoh, M.
三维微焊接（3DMW）是一种结合钨极惰性气体保护焊（TIG）、快速成型（RP）和自蔓延高温合成（SHS）的新型自由成形制造方法。研究了电弧峰值电流、焊道直径和接触角等成形参数的优化。随着电弧峰值电流的增大，钛珠的高度和接触角减小，宽度增大。通过钛珠的连续堆叠和焊接形成具有α相钛的针状树枝状微观结构的3D钛钉。Ni-Al、Ti-Ni和Ti-Fe系的简单金属间合金针状物也通过其组分线的交替堆叠而形成。没有观察到孔隙和裂纹，但观察到均匀的组成。放热的SHS反应应该发生并有助于金属间合金的形成。环形和双螺旋形状的3D钛物体直接从它们的计算机模型形成，而不使用模具或冲模。(c)2006爱思唯尔有限公司版权所有。
3D micro welding (3DMW) is a new freeform, fabrication method which combines tungsten inert gas (TIG) welding, rapid prototyping (RP), and self-propagating high temperature synthesis (SHS). The optimization of forming parameters such as arc peak current, bead diameter and contact angle was investigated. As the arc peak current increased, the height and the contact angle of a titanium bead were decreased, but the width increased. 3D titanium pins with needle-like dendritic microstructure of alpha-phase titanium were formed by continuous stacking and welding of titanium beads. Simple intermetallic alloy pin objects of Ni-Al, Ti-Ni and Ti-Fe systems were also formed by alternate stacking of their component wires. No pore and crack was observed but the uniform composition was observed. The exothermic SHS reactions should take place and assist the intermetallic alloy formation. 3D titanium objects of ring and double helix shapes were formed directly from their computer models without using molds or dies. (c) 2006 Elsevier Ltd. All rights reserved.