Investigate on the mechanism of Nb and Ti element doping to enhance the stress rupture life of high-tungsten superalloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-06-25 DOI:10.1016/j.intermet.2025.108890

Xiang Fei , Naicheng Sheng , Chen Wang , Shijie Sun , Jinjiang Yu , Guichen Hou , Jinguo Li , Yizhou Zhou , Xiaofeng Sun

{"title":"Investigate on the mechanism of Nb and Ti element doping to enhance the stress rupture life of high-tungsten superalloy","authors":"Xiang Fei , Naicheng Sheng , Chen Wang , Shijie Sun , Jinjiang Yu , Guichen Hou , Jinguo Li , Yizhou Zhou , Xiaofeng Sun","doi":"10.1016/j.intermet.2025.108890","DOIUrl":null,"url":null,"abstract":"<div><div>The effect of Nb and Ti on the microstructure and stress rupture life of high tungsten superalloy was studied experimental characterization and theoretical calculation. Referring to the existing high-tungsten superalloys, the phase composition of different Nb as well as Ti contents was calculated and counted by Thermo-Calc calculation. Both the Nb and Ti contents were decided to be 1.8 wt % and 0.8 wt %, respectively, as the addition amount of Nb and Ti in this experiment. The experimental results revealed that the addition of Nb and Ti promoted the increase of MC carbides as well as γ′-phase area fraction, and the stress rupture life (1100 °C/70 MPa) with1.8Nb0.8Ti is nearly 7.5 times higher than that of alloy with 0Nb0Ti. The crack of the alloy with 0Nb0Ti were found to initiate at MC carbides and extend along grain boundary, and eventually fractured. The addition of Nb and Ti reduced the W content in MC carbide and improved the coordinated deformation ability between MC carbide and γ phase, the initiation of the crack was difficult to occur at γ/γ′ interface. Through the first-principles calculation, the elastic modulus of γ′-Ni<sub>3</sub> (Al<sub>0.5</sub>Nb<sub>0.25</sub>Ti<sub>0.25</sub>) phase with the addition of Nb and Ti is obviously increased, which obviously enhance the deformation resistance ability of γ′ phase, and dislocations were not easy to shear into the interior of γ′ phase and form dislocation network with high density at interface of γ/γ′ phases, substantially improving the stress rupture life. The experimental results and in-depth analysis provided theoretical reference and support for the future high tungsten superalloys design.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108890"},"PeriodicalIF":4.3000,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Intermetallics","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0966979525002559","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

The effect of Nb and Ti on the microstructure and stress rupture life of high tungsten superalloy was studied experimental characterization and theoretical calculation. Referring to the existing high-tungsten superalloys, the phase composition of different Nb as well as Ti contents was calculated and counted by Thermo-Calc calculation. Both the Nb and Ti contents were decided to be 1.8 wt % and 0.8 wt %, respectively, as the addition amount of Nb and Ti in this experiment. The experimental results revealed that the addition of Nb and Ti promoted the increase of MC carbides as well as γ′-phase area fraction, and the stress rupture life (1100 °C/70 MPa) with1.8Nb0.8Ti is nearly 7.5 times higher than that of alloy with 0Nb0Ti. The crack of the alloy with 0Nb0Ti were found to initiate at MC carbides and extend along grain boundary, and eventually fractured. The addition of Nb and Ti reduced the W content in MC carbide and improved the coordinated deformation ability between MC carbide and γ phase, the initiation of the crack was difficult to occur at γ/γ′ interface. Through the first-principles calculation, the elastic modulus of γ′-Ni₃ (Al_0.5Nb_0.25Ti_0.25) phase with the addition of Nb and Ti is obviously increased, which obviously enhance the deformation resistance ability of γ′ phase, and dislocations were not easy to shear into the interior of γ′ phase and form dislocation network with high density at interface of γ/γ′ phases, substantially improving the stress rupture life. The experimental results and in-depth analysis provided theoretical reference and support for the future high tungsten superalloys design.

查看原文本刊更多论文

探讨了铌、钛元素掺杂提高高钨高温合金应力断裂寿命的机理

研究了Nb和Ti对高钨高温合金显微组织和应力断裂寿命的影响，并进行了实验表征和理论计算。参考现有的高钨高温合金，采用热钙法计算和计数了不同Nb和Ti含量的相组成。本实验确定Nb和Ti的添加量分别为1.8 wt %和0.8 wt %。实验结果表明，Nb和Ti的加入促进了MC碳化物的增加和γ′相面积分数的增加，1.8 nb0.8 Ti合金的应力断裂寿命（1100℃/70 MPa）比添加0Nb0Ti合金提高了近7.5倍。含0Nb0Ti合金的裂纹从MC碳化物处开始，沿晶界扩展，最终断裂。Nb和Ti的加入降低了MC碳化物中W的含量，提高了MC碳化物与γ相的协调变形能力，在γ/γ′界面处难以发生裂纹的起裂。通过第一性原理计算，添加Nb和Ti后，γ′-Ni3 （Al0.5Nb0.25Ti0.25）相的弹性模量明显增加，明显增强了γ′相的抗变形能力，位错不易剪切进入γ′相内部，在γ/γ′相界面处形成高密度的位错网络，大大提高了应力断裂寿命。实验结果和深入分析为今后高钨高温合金的设计提供了理论参考和支持。

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

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.