Simultaneous improvement in strength and plasticity of Ti-24Nb-4Zr-8Sn manufactured by selective laser melting

被引：50
|
作者：
Yang, C. L. [1 ,3 ]
Zhang, Z. J. [1 ]
Li, S. J. [1 ]
Liu, Y. J. [2 ]
Sercombe, T. B. [2 ]
Hou, W. T. [1 ]
Zhang, P. [1 ]
Zhu, Y. K. [1 ]
Hao, Y. L. [1 ]
Zhang, Z. F. [1 ]
Yang, R. [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
[2] Univ Western Australia, Sch Mech & Chem Engn, Crawley, WA 6009, Australia
[3] Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing 100049, Peoples R China
来源：
MATERIALS & DESIGN | 2018年 / 157卷
基金：
中国国家自然科学基金;
关键词：
Selective laser melting; Strength and plasticity; Strain hardening; Bi-model structure; RANGE INTERNAL-STRESSES; HIGH-PRESSURE TORSION; CU-AL ALLOYS; MECHANICAL-PROPERTIES; DEFORMATION MECHANISMS; FRACTURE-TOUGHNESS; TITANIUM-ALLOYS; HEAT-TREATMENT; NB ALLOYS; MICROSTRUCTURE;
D O I：
10.1016/j.matdes.2018.07.036
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The strength and plasticity of metallic materials usually exhibit a trade-off relation. This study reports a simultaneous improvement in the ultimate tensile strength (UTS) and uniform elongation (UE) of Ti-24Nb-4Zr-8Sn (Ti2448) fabricated by selective laser melting (SLM), relative to those produced via forging. Detailed microstructural characterization reveals that the outstanding tensile property may result from the bi-model structure that forms during the rapid cooling associated with SLM. Coarse grains are surrounded by fine grains within the melt pool, which causes a back stress during tension. The back stress provides additional strain-hardening capacity, which postpones the initiation of necking and then leads to the simultaneous improvement of the strength and plasticity (SISP) of the Ti2448 alloy. Furthermore, the tensile property of the SLM-fabricated sample is anisotropic which is strongly related to the irregular shape of the melt pool. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码：52 / 59
页数：8
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