Cracking and Precipitation Behavior of Refractory BCC–B2 Alloys Under Laser Melting Conditions

Kaitlyn M. Mullin, Sebastian A. Kube, Sophia K. Wu, Tresa M. Pollock
{"title":"Cracking and Precipitation Behavior of Refractory BCC–B2 Alloys Under Laser Melting Conditions","authors":"Kaitlyn M. Mullin, Sebastian A. Kube, Sophia K. Wu, Tresa M. Pollock","doi":"10.1007/s11661-024-07541-2","DOIUrl":null,"url":null,"abstract":"<p>Emulating the Ni-base superalloy <span>\\(\\gamma \\)</span> + <span>\\(\\gamma ^{\\prime }\\)</span> microstructure in BCC–B2 refractory alloys is a promising design strategy to achieve high temperature strength and ductility. Ru-base B2 precipitates have shown exceptional thermal stability but can be difficult to solutionize, making high cooling rate solidification pathways like additive manufacturing (AM) a promising approach for synthesis of more homogeneous microstructures. Using single track laser experiments on aged bulk substrates, five representative refractory alloys with varying Ru-base B2 precipitates (AlRu, HfRu, TiRu) and matrix constituents (Mo, Nb) were investigated for their solidification behavior and defect susceptibility under laser melting conditions. Susceptibility to solidification cracking, solid-state cracking, and keyhole formation was found to be highly dependent on the matrix composition. Characterization of the melt pools by scanning and transmission electron microscopy shows evidence for disordered BCC upon solidification, enabling tailoring of the B2 precipitates that are thermodynamically stable above 1300 °C. The B2 precipitate morphologies in the melt tracks after aging treatments are influenced by the partitioning behavior of Ru from laser melting. Results from these single track experiments provide guidance toward design strategies for fabricable refractory BCC–B2 alloys.</p>","PeriodicalId":18504,"journal":{"name":"Metallurgical and Materials Transactions A","volume":"21 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metallurgical and Materials Transactions A","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1007/s11661-024-07541-2","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

Emulating the Ni-base superalloy \(\gamma \) + \(\gamma ^{\prime }\) microstructure in BCC–B2 refractory alloys is a promising design strategy to achieve high temperature strength and ductility. Ru-base B2 precipitates have shown exceptional thermal stability but can be difficult to solutionize, making high cooling rate solidification pathways like additive manufacturing (AM) a promising approach for synthesis of more homogeneous microstructures. Using single track laser experiments on aged bulk substrates, five representative refractory alloys with varying Ru-base B2 precipitates (AlRu, HfRu, TiRu) and matrix constituents (Mo, Nb) were investigated for their solidification behavior and defect susceptibility under laser melting conditions. Susceptibility to solidification cracking, solid-state cracking, and keyhole formation was found to be highly dependent on the matrix composition. Characterization of the melt pools by scanning and transmission electron microscopy shows evidence for disordered BCC upon solidification, enabling tailoring of the B2 precipitates that are thermodynamically stable above 1300 °C. The B2 precipitate morphologies in the melt tracks after aging treatments are influenced by the partitioning behavior of Ru from laser melting. Results from these single track experiments provide guidance toward design strategies for fabricable refractory BCC–B2 alloys.

Abstract Image

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
激光熔化条件下难熔 BCC-B2 合金的裂纹和沉淀行为
在 BCC-B2 耐火合金中模仿镍基超级合金的 \(\gamma \) + \(\gamma ^{\prime }\) 显微结构是实现高温强度和延展性的一种有前途的设计策略。Ru 基 B2 沉淀物显示出卓越的热稳定性,但很难溶解,这使得增材制造(AM)等高冷却速率凝固途径成为合成更均匀微观结构的可行方法。通过在老化的块状基底上进行单轨激光实验,研究了五种具有代表性的难熔合金,它们的Ru基B2析出物(AlRu、HfRu、TiRu)和基体成分(Mo、Nb)各不相同,在激光熔化条件下的凝固行为和缺陷敏感性也各不相同。研究发现,凝固开裂、固态开裂和键孔形成的敏感性与基体成分有很大关系。通过扫描和透射电子显微镜对熔池进行的表征显示了凝固时无序 BCC 的证据,这使得 B2 沉淀物在 1300 °C 以上热力学稳定。老化处理后熔池轨道中的 B2 沉淀形态受到激光熔化产生的 Ru 分区行为的影响。这些单轨实验的结果为可制造难熔 BCC-B2 合金的设计策略提供了指导。
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
Grain Refining and Cracking During Solidification Dendrite Growth in Single-Grain and Cyclic-Twinned Sn–3Ag–0.5Cu Solder Joints Remarkable Cryogenic Strength and Ductility of AISI 904L Superaustenitic Stainless Steel: A Comparative Study Eutectic Solidification Morphologies in Rapidly Solidified Hypereutectic Sn–Ag Solder Alloy The Effect of Silicon Substitution by Boron for the α-Nb5Si3: INSIGHTS into the Constitutive Properties of Nb5Si2B Through Theory and Experimental Approach
×
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