Effect of Build Geometry and Porosity in Additively Manufactured CuCrZr

Anup Kulkarni, Vivek C. Peddiraju, S. Chatterjee, D. Srinivasan
{"title":"Effect of Build Geometry and Porosity in Additively Manufactured CuCrZr","authors":"Anup Kulkarni, Vivek C. Peddiraju, S. Chatterjee, D. Srinivasan","doi":"10.1115/iam2022-93986","DOIUrl":null,"url":null,"abstract":"\n The current work presents an understanding of microstructure and mechanical properties as a function of build geometry and build orientation in Cu-Cr-Zr via the laser powder bed fusion (LPBF) technique. Porosity, microstructure, and mechanical properties have been compared in the as-printed (AP) and heat treated (HT) LPBF Cu-Cr-Zr, between cylindrical and cube geometries, along the longitudinal (L) and transverse (T) build orientations. Varying porosity levels were observed that yielded parts with 96–97% relative density in the AP condition. The AP microstructure, characterized by a combination of optical and electron microscopic techniques, demonstrated a hierarchical microstructure, comprising of grains (2.5–100 μm) with a cellular substructure (400–850 nm) and intracellular nanoscale (20–60 nm) precipitates enriched in Cu and Zr. Unlike most materials in the AP condition, crystallographic texture was found to be absent; however, very distinct river like patterns highlighted a novel characteristic of the LPBF Cu-Cr-Zr. Upon solutionizing and aging, Cr precipitates were seen heterogeneously nucleating along cell boundaries (0.5–1.3 μm), causing up to 45% enhancement in the strength and a 4–5% lower ductility. The yield strength along the transverse orientation was 10–16% higher than that of longitudinal orientation, in both the AP and HT conditions. Fracture surface of the tensile samples exhibited micro-voids and cleavage facets and unmelted particles. In spite of the observed defects, the overall mechanical properties matched well with those obtained in nearly dense (> 99%) samples and the mechanical property debit was less than 10%.","PeriodicalId":184278,"journal":{"name":"2022 International Additive Manufacturing Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2022-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2022 International Additive Manufacturing Conference","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1115/iam2022-93986","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

The current work presents an understanding of microstructure and mechanical properties as a function of build geometry and build orientation in Cu-Cr-Zr via the laser powder bed fusion (LPBF) technique. Porosity, microstructure, and mechanical properties have been compared in the as-printed (AP) and heat treated (HT) LPBF Cu-Cr-Zr, between cylindrical and cube geometries, along the longitudinal (L) and transverse (T) build orientations. Varying porosity levels were observed that yielded parts with 96–97% relative density in the AP condition. The AP microstructure, characterized by a combination of optical and electron microscopic techniques, demonstrated a hierarchical microstructure, comprising of grains (2.5–100 μm) with a cellular substructure (400–850 nm) and intracellular nanoscale (20–60 nm) precipitates enriched in Cu and Zr. Unlike most materials in the AP condition, crystallographic texture was found to be absent; however, very distinct river like patterns highlighted a novel characteristic of the LPBF Cu-Cr-Zr. Upon solutionizing and aging, Cr precipitates were seen heterogeneously nucleating along cell boundaries (0.5–1.3 μm), causing up to 45% enhancement in the strength and a 4–5% lower ductility. The yield strength along the transverse orientation was 10–16% higher than that of longitudinal orientation, in both the AP and HT conditions. Fracture surface of the tensile samples exhibited micro-voids and cleavage facets and unmelted particles. In spite of the observed defects, the overall mechanical properties matched well with those obtained in nearly dense (> 99%) samples and the mechanical property debit was less than 10%.
增材制造CuCrZr中构造几何和孔隙率的影响
目前的工作是通过激光粉末床熔融(LPBF)技术了解Cu-Cr-Zr的微观结构和力学性能作为构建几何形状和构建方向的函数。在纵向(L)和横向(T)构建方向上,比较了打印(AP)和热处理(HT) LPBF Cu-Cr-Zr的孔隙率、微观结构和力学性能。在AP条件下,观察到不同孔隙率的零件相对密度为96-97%。结合光学和电子显微镜技术对AP微观结构进行了表征,结果表明AP微观结构呈层次结构,由2.5 ~ 100 μm的细胞亚结构(400 ~ 850 nm)和细胞内纳米级(20 ~ 60 nm)富集Cu和Zr的沉淀组成。与AP条件下的大多数材料不同,晶体织构缺失;然而,非常明显的河流样模式突出了LPBF Cu-Cr-Zr的新特征。在固溶和时效过程中,Cr析出物沿晶界(0.5 ~ 1.3 μm)呈非均匀形核,导致强度提高45%,塑性降低4 ~ 5%。在AP和HT条件下,沿横向的屈服强度比纵向的高10-16%。拉伸试样断口表面出现微孔洞、解理面和未熔化颗粒。尽管观察到缺陷,但整体力学性能与近致密(> 99%)样品的力学性能匹配良好,力学性能偏差小于10%。
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 求助全文
来源期刊
自引率
0.00%
发文量
0
×
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
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
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 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信