An experimental and simulation study on build thickness dependent microstructure for electron beam melted Ti-6Al-4V

被引:105
作者
Tan, Xipeng [1 ]
Kok, Yihong [1 ]
Tan, Yu Jun [1 ]
Vastola, Guglielmo [2 ]
Pei, Qing Xiang [2 ]
Zhang, Gang [2 ]
Zhang, Yong-Wei [2 ]
Tor, Shu Beng [1 ]
Leong, Kah Fai [1 ]
Chua, Chee Kai [1 ]
机构
[1] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore Ctr Printing 3D, Singapore 637372, Singapore
[2] ASTAR, Inst High Performance Comp, Singapore 138632, Singapore
关键词
Additive manufacturing; Electron beam melting; Titanium alloys; Martensitic transformations; Finite element simulations; MECHANICAL-PROPERTIES; MANUFACTURED TI-6AL-4V; TEMPERATURE; TEXTURE; ALLOY; PARTS; PHASE;
D O I
10.1016/j.jallcom.2015.05.178
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Build thickness dependent microstructure of electron beam melted (EBM (R)) Ti-6Al-4V has been investigated from both experiment and simulation using four block samples with thicknesses of 1, 5, 10 and 20 mm. We observe a mixed microstructure of alternate alpha/beta with some alpha' martensite inside the 1 mm-thick sample. By contrast, only the alternate a/b microstructure with both colony and basket-weave morphologies occurs inside the 5 mm-, 10 mm-and 20 mm-thick samples. It is found that beta spacing is constantly increased with the build thickness, leading to an obvious decrease in microhardness. Finite element method (FEM) simulations show that cooling rates and thermal profiles during EBM process are favorable for the formation of martensite. Moreover, full-scale FEM simulations reveal that the average temperature inside the samples is higher as the build thickness increases. It suggests that martensitic decomposition is faster in thicker samples, which is in good agreement with the experimental observations. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:303 / 309
页数:7
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