Grain Morphology and Texture Development in a Co-Cr-Mo Alloy Fabricated by Powder Bed Fusion with an Electron Beam

Yufan Zhao, Yuichiro Koizumi, K. Aoyagi, Daixiu Wei, K. Yamanaka, A. Chiba
{"title":"Grain Morphology and Texture Development in a Co-Cr-Mo Alloy Fabricated by Powder Bed Fusion with an Electron Beam","authors":"Yufan Zhao, Yuichiro Koizumi, K. Aoyagi, Daixiu Wei, K. Yamanaka, A. Chiba","doi":"10.2139/ssrn.3358846","DOIUrl":null,"url":null,"abstract":"Grain morphology, size, and growth direction are crucial in determining the performances of metallic implant components. Understanding the effects of the manufacturing characteristics of powder bed fusion with an electron beam (PBF-EB), an additive manufacturing process, on microstructure formation and anisotropy development during solidification is essential to achieve flexible microstructure control. In this study, PBF-EB was employed to fabricate a Co-Cr-Mo alloy and the grain morphology and texture formation with different process parameters were analyzed by experimental characterization with the aid of computational thermal-fluid dynamics simulations. It was found that the epitaxial growth with resulting columnar grain and near-cubic texture tended to be dominant in the solidification process, due to competitive grain growth and the heat flow characteristics in the snake-scanning strategy. However, the molten pool connection between adjacent melt tracks resulted in the random orientation of <001> in the horizontal plane, producing a fiber-like texture. In addition, nucleation and new grain growth rather than extensive epitaxial growth could be achieved by manipulating the molten pool geometry and overlap between adjacent melt tracks. Increasing the slope of the solid/liquid interface of the molten pool and decreasing the remelting fraction of adjacent melt tracks favored the formation of new grains with random orientations to restrict the extensive epitaxial growth of the columnar grains and attenuate the microstructural anisotropy.","PeriodicalId":220342,"journal":{"name":"Materials Science Educator: Courses","volume":"43 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2019-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Science Educator: Courses","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2139/ssrn.3358846","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1

Abstract

Grain morphology, size, and growth direction are crucial in determining the performances of metallic implant components. Understanding the effects of the manufacturing characteristics of powder bed fusion with an electron beam (PBF-EB), an additive manufacturing process, on microstructure formation and anisotropy development during solidification is essential to achieve flexible microstructure control. In this study, PBF-EB was employed to fabricate a Co-Cr-Mo alloy and the grain morphology and texture formation with different process parameters were analyzed by experimental characterization with the aid of computational thermal-fluid dynamics simulations. It was found that the epitaxial growth with resulting columnar grain and near-cubic texture tended to be dominant in the solidification process, due to competitive grain growth and the heat flow characteristics in the snake-scanning strategy. However, the molten pool connection between adjacent melt tracks resulted in the random orientation of <001> in the horizontal plane, producing a fiber-like texture. In addition, nucleation and new grain growth rather than extensive epitaxial growth could be achieved by manipulating the molten pool geometry and overlap between adjacent melt tracks. Increasing the slope of the solid/liquid interface of the molten pool and decreasing the remelting fraction of adjacent melt tracks favored the formation of new grains with random orientations to restrict the extensive epitaxial growth of the columnar grains and attenuate the microstructural anisotropy.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
电子束粉末床熔合Co-Cr-Mo合金的晶粒形貌和织构发展
晶粒形态、尺寸和生长方向是决定金属植入材料性能的关键因素。了解粉末床电子束熔炼工艺(PBF-EB)的制造特性对凝固过程中微观组织形成和各向异性发展的影响,是实现柔性微观组织控制的必要条件。本研究采用PBF-EB制备Co-Cr-Mo合金,通过实验表征,结合计算热流体力学模拟,分析了不同工艺参数下Co-Cr-Mo合金的晶粒形貌和织构形成。在凝固过程中,由于晶粒的竞争生长和蛇形扫描策略中的热流特性,外延生长形成柱状晶粒和近立方织构。然而,相邻熔体轨迹之间的熔池连接导致了<001>在水平面上,产生纤维状的纹理。此外,可以通过控制熔池的几何形状和相邻熔体轨迹之间的重叠来实现成核和新晶粒的生长,而不是广泛的外延生长。增大熔池固液界面的斜率和减小相邻熔体的重熔分数有利于形成具有随机取向的新晶粒,从而限制柱状晶粒的广泛外延生长,减弱微观组织的各向异性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
自引率
0.00%
发文量
0
期刊最新文献
CSR and Firm Survival: Evidence from the Climate and Pandemic Crises Numerical Solution of the Partial Differential Equation using Randomly Generated Finite Grids and Two-Dimensional Fractional-Order Legendre Function Indoor Rock Climbing: The Nuts and Bolts of Routesetting Copyright Protection Post-Star Athletica Comparing Multi-Dimensional Energy–Momentum Equation and Relativistic Energy– Momentum Equation, Which Equation Is Wrong? Constructing a Method for Solving the Riccati Equations to Describe Objects Parameters in An Analytical Form
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1