Massive transformation in Ti-6Al-4V additively manufactured by selective electron beam melting

被引：166
作者：
Lu, S. L. [1 ,3 ]
Qian, M. [2 ,3 ]
Tang, H. P. [3 ]
Yan, M. [4 ]
Wang, J. [3 ]
StJohn, D. H. [5 ]
机构：
[1] Northeastern Univ, Sch Met & Mat, Shenyang 110819, Peoples R China
[2] RMIT Univ, Sch Aerosp Mech & Mfg Engn, Ctr Addit Mfg, Melbourne, Vic 3000, Australia
[3] Northwest Inst Nonferrous Met Res, State Key Lab Porous Met Mat, Xian 710016, Peoples R China
[4] SUSTC, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
[5] Univ Queensland, Sch Mech & Min Engn, Ctr Adv Mat Proc & Mfg, Brisbane, Qld 4072, Australia
来源：
ACTA MATERIALIA | 2016年 / 104卷
基金：
澳大利亚研究理事会; 中国国家自然科学基金;
关键词：
Ti-6Al-4V; Massive transformation; Additive manufacturing; Selective electron beam melting; PHASE-TRANSFORMATION; TI-AG; BETA; KINETICS; FEATURES; PURE; AU;
D O I：
10.1016/j.actamat.2015.11.011
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The occurrence of the 13 (bcc) to alpha(m) (hcp) massive transformation in Ti-6Al-4V (wt.%) during additive manufacturing (AM) by selective electron beam melting (SEBM) has been identified. A variety of patch shaped massive grains including both grain boundary (GB)-crossing and non-GB-crossing instances were characterised and their formation temperature and growth rate were estimated. In contrast to conventional Ti-6Al-4V, the massive grains in SEBM-fabricated Ti-6Al-4V consist of ultrafine lamellar alpha and beta phases (100 nm wide beta strips) due to in-situ decomposition of the massive grains during AM. The resulting ultrafine alpha-beta lamellae obey the typical Burgers orientation relationship established for the lamellar alpha-beta structure in conventional Ti-6Al-4V. These findings show that the beta (bcc) to alpha(m) (hcp) massive transformation significantly contributes to development of the Ti-6Al-4V microstructure during AM by SEBM, providing an alternative microstructural design strategy for AM of Ti-6Al-4V and other titanium alloys. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：303 / 311
页数：9
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