{"title":"αs和α′相含量对电子束焊接Ti-3Al-2Mo-2Zr合金冲击韧性的影响","authors":"Yuzhao Lv , Ting Wang , Pengfei Zhao , Guijun Mao","doi":"10.1016/j.msea.2025.148353","DOIUrl":null,"url":null,"abstract":"<div><div>Due to the non-equilibrium nature of the weld metal (WM) solidification process, it is challenging to achieve superior impact toughness in titanium alloy joints. Electron beam welding (EBW) was used to join 30-mm-thick Ti-3Al-2Mo-2Zr titanium alloy plates. The factors contributing to the impact toughness of WM were elucidated. The WM consisted of columnar grains and a few equiaxed grains. Fine acicular colony α′ phase and acicular secondary α (α<sub>s</sub>) phase were present in the grains. The top region retained 64 % of the base metal's impact toughness, while the bottom region retained only 36 % of the base metal's impact toughness. Moreover, reducing the welding speed improved the impact toughness of WM. The colony α′ in WM enhanced impact toughness due to its good ability to hinder crack propagation. The α<sub>s</sub> phase reduced impact toughness due to its poor resistance to crack propagation. This study provides a reference for optimizing the toughness of titanium alloy EBW joints.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"935 ","pages":"Article 148353"},"PeriodicalIF":7.9000,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of αs and α′ phase contents on the impact toughness of Ti-3Al-2Mo-2Zr alloy welded by electron beam\",\"authors\":\"Yuzhao Lv , Ting Wang , Pengfei Zhao , Guijun Mao\",\"doi\":\"10.1016/j.msea.2025.148353\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Due to the non-equilibrium nature of the weld metal (WM) solidification process, it is challenging to achieve superior impact toughness in titanium alloy joints. Electron beam welding (EBW) was used to join 30-mm-thick Ti-3Al-2Mo-2Zr titanium alloy plates. The factors contributing to the impact toughness of WM were elucidated. The WM consisted of columnar grains and a few equiaxed grains. Fine acicular colony α′ phase and acicular secondary α (α<sub>s</sub>) phase were present in the grains. The top region retained 64 % of the base metal's impact toughness, while the bottom region retained only 36 % of the base metal's impact toughness. Moreover, reducing the welding speed improved the impact toughness of WM. The colony α′ in WM enhanced impact toughness due to its good ability to hinder crack propagation. The α<sub>s</sub> phase reduced impact toughness due to its poor resistance to crack propagation. This study provides a reference for optimizing the toughness of titanium alloy EBW joints.</div></div>\",\"PeriodicalId\":385,\"journal\":{\"name\":\"Materials Science and Engineering: A\",\"volume\":\"935 \",\"pages\":\"Article 148353\"},\"PeriodicalIF\":7.9000,\"publicationDate\":\"2025-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Materials Science and Engineering: A\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0921509325005775\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2025/4/15 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Science and Engineering: A","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921509325005775","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/4/15 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Effects of αs and α′ phase contents on the impact toughness of Ti-3Al-2Mo-2Zr alloy welded by electron beam
Due to the non-equilibrium nature of the weld metal (WM) solidification process, it is challenging to achieve superior impact toughness in titanium alloy joints. Electron beam welding (EBW) was used to join 30-mm-thick Ti-3Al-2Mo-2Zr titanium alloy plates. The factors contributing to the impact toughness of WM were elucidated. The WM consisted of columnar grains and a few equiaxed grains. Fine acicular colony α′ phase and acicular secondary α (αs) phase were present in the grains. The top region retained 64 % of the base metal's impact toughness, while the bottom region retained only 36 % of the base metal's impact toughness. Moreover, reducing the welding speed improved the impact toughness of WM. The colony α′ in WM enhanced impact toughness due to its good ability to hinder crack propagation. The αs phase reduced impact toughness due to its poor resistance to crack propagation. This study provides a reference for optimizing the toughness of titanium alloy EBW joints.
期刊介绍：
Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.
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