Effect of stress relaxation on distortion in additive manufacturing process modeling

被引：177
作者：
Denlinger, Erik R. [1 ]
Michaleris, Pan [1 ]
机构：
[1] Autodesk Inc, San Rafael, CA 94903 USA
来源：
ADDITIVE MANUFACTURING | 2016年 / 12卷
关键词：
LDED; Distortion; Residual stress; FEM;
D O I：
10.1016/j.addma.2016.06.011
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A method for modeling the effect of stress relaxation at high temperatures during laser direct energy deposition processes is experimentally validated for Ti-6AI-4V samples subject to different inter-layer dwell times. The predicted mechanical responses are compared to those of Inconel (R) 625 samples, which experience no allotropic phase transformation, deposited under identical process conditions. The thermal response of workpieces in additive manufacturing is known to be strongly dependent on dwell time. In this work the dwell times used vary from 0 to 40 s. Based on past research on ferretic steels and the additive manufacturing of titanium alloys it is assumed that the effect of transformation strain in Ti-6AI-4V acts to oppose all other strain components, effectively eliminating all residual stress at temperatures above 690 degrees C. The model predicts that Inconel (R) 625 exhibits increasing distortion with decreasing dwell times but that Ti-6AI-4V displays the opposite behavior, with distortion dramatically decreasing with lowering dwell time. These predictions are accurate when compared with experimental in situ and post-process measurements. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：51 / 59
页数：9
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