Additive manufacturing of Ti-6Al-4V lattice structures with high structural integrity under large compressive deformation
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  • 英文篇名：Additive manufacturing of Ti-6Al-4V lattice structures with high structural integrity under large compressive deformation
  • 作者：Kun ; Yang ; Jian ; Wang ; Liang ; Jia ; Guangyu ; Yang ; Huiping ; Tang ; Yuanyuan ; Li
  • 英文作者：Kun Yang;Jian Wang;Liang Jia;Guangyu Yang;Huiping Tang;Yuanyuan Li;College of Materials Science and Engineering,Jilin University;State Key Laboratory of Porous Metal Materials,Northwest Institute for Nonferrous Metal Research;
  • 英文关键词：Selective electron beam melting;;Ti-6Al-4V;;Lattice structures;;Ductility;;Annealing;;Beta annealing
  • 中文刊名：CLKJ
  • 英文刊名：材料科学技术(英文版)
  • 机构：College of Materials Science and Engineering, Jilin University;State Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research;
  • 出版日期：2019-02-15
  • 出版单位：Journal of Materials Science & Technology
  • 年：2019
  • 期：v.35
  • 基金：supported by the National Key Research and Development Project (Grant No. 2016 YFB 1101403);; the National Key Foundation for Exploring Scientific Instrument of China (Grant No. 2016 YQ 51627805)
  • 语种：英文;
  • 页：CLKJ201902007
  • 页数：6
  • CN：02
  • ISSN：21-1315/TG
  • 分类号：77-82
摘要
Additively manufactured Ti-6 Al-4 V lattice structures have found important niche applications. However, they often show insufficient compressive ductility or insufficient structural integrity. In this study,a batch of 45 octahedral Ti-6 Al-4 V lattice structures was manufactured in three different strut diameters(0.5, 1.0, 1.5 mm) by selective electron beam melting(SEBM). The influence of post-SEBM annealing on the compressive deformation characteristics of the lattice structure was investigated. The as-built Ti-6 Al-4 V lattices fragmented when the compressive strain reached 13%–23% depending on strut diameter.Annealing at 950?C(β transus temperature: 995?C) only slightly improved the compressive ductility of the lattice structures. However, annealing at 1050?C(β-annealing) fundamentally changed the compressive deformation mode of the lattice structures. The resultant compressive stress-strain curve was featured by a long smooth plateau and no facture occurred even after significant densification of the lattice structure had taken place(>50% of compressive strain).
        Additively manufactured Ti-6 Al-4 V lattice structures have found important niche applications. However, they often show insufficient compressive ductility or insufficient structural integrity. In this study,a batch of 45 octahedral Ti-6 Al-4 V lattice structures was manufactured in three different strut diameters(0.5, 1.0, 1.5 mm) by selective electron beam melting(SEBM). The influence of post-SEBM annealing on the compressive deformation characteristics of the lattice structure was investigated. The as-built Ti-6 Al-4 V lattices fragmented when the compressive strain reached 13%–23% depending on strut diameter.Annealing at 950?C(β transus temperature: 995?C) only slightly improved the compressive ductility of the lattice structures. However, annealing at 1050?C(β-annealing) fundamentally changed the compressive deformation mode of the lattice structures. The resultant compressive stress-strain curve was featured by a long smooth plateau and no facture occurred even after significant densification of the lattice structure had taken place(>50% of compressive strain).
引文
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