Effect of powder oxidation on the impact toughness of electron beam melting Ti-6Al-4V

被引：46

作者：

Grell, W. A. ^{[1
,2
]}

Solis-Ramos, E. ^{[1
]}

Clark, E. ^{[1
]}

Lucon, E. ^{[3
]}

Garboczi, E. J. ^{[3
]}

Predecki, P. K. ^{[1
]}

Loftus, Z. ^{[2
]}

Kumosa, M. ^{[1
]}

机构：

[1] Univ Denver, NSF Ctr Novel High Voltage Temp Mat & Struct, Denver, CO 80208 USA

[2] Lockheed Martin Space Syst Co, Littleton, CO 80125 USA

[3] NIST, Appl Chem & Mat Div, Boulder, CO 80305 USA

来源：

ADDITIVE MANUFACTURING | 2017年 / 17卷

基金：

美国国家科学基金会;

关键词：

Additive manufacturing; Ti-6Al-4V powder; EBM; Oxidation; Charpy impact toughness; X-ray computed tomography;

D O I：

10.1016/j.addma.2017.08.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Powder quality in additive manufacturing (AM) electron beam melting (EBM) of Ti-6Al-4V components is crucial in determining the critical material properties of the end item. In this study, we report on the effect of powder oxidation on the Charpy impact energy of Ti-6Al-4V parts manufactured using EBM. In addition to oxidation, the effects on impact energy due to hot isostatic pressing (HIP), specimen orientation, and EBM process defects were also investigated. This research has shown that excessive powder oxidation (oxygen mass fraction above 0.25% and up to 0.46%) dramatically decreases the impact energy. It was determined that the room temperature impact energy of the parts after excessive oxidation was reduced by about seven times. We also report that HIP post-processing significantly increases the impact toughness, especially for specimens with lower or normal oxygen content. The specimen orientation effect was found to be more significant for low oxidation levels. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：123 / 134

页数：12

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