Hydrogen Transport and Rationalization of Porosity Formation during Welding of Titanium Alloys

被引：0
|
作者：
Jianglin Huang
Nils Warnken
Jean-Christophe Gebelin
Martin Strangwood
Roger C. Reed
机构：
[1] The University of Birmingham,Department of Metallurgy and Materials
[2] Edgbaston,undefined
来源：
Metallurgical and Materials Transactions A | 2012年 / 43卷
关键词：
Welding; Titanium Alloy; Liquid Metal; Hydrogen Concentration; Weld Pool;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The transport of hydrogen during fusion welding of the titanium alloy Ti-6Al4V is analyzed. A coupled thermodynamic/kinetic treatment is proposed for the mass transport within and around the weld pool. The modeling indicates that hydrogen accumulates in the weld pool as a consequence of the thermodynamic driving forces that arise; a region of hydrogen depletion exists in cooler, surrounding regions in the heat-affected zone and beyond. Coupling with a hydrogen diffusion-controlled bubble growth model is used to simulate bubble growth in the melt and, thus, to make predictions of the hydrogen concentration barrier needed for pore formation. The effects of surface tension of liquid metal and the radius of preexisting microbubble size on the barrier are discussed. The work provides insights into the mechanism of porosity formation in titanium alloys.
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页码：582 / 591
页数：9
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