Effect of Welding Parameters on Microstructure and Mechanical Properties of Friction Stir Lap Welds of an Ultrahigh Strength Steel

Yutaka S. Sato, Shunsuke Mimura, Shun Tokita, Yusuke Yasuda, Akihiro Sato, Satoshi Hirano

研究成果: 書籍の章/レポート/Proceedings会議への寄与査読

抄録

In this study, effect of welding parameters on microstructure and mechanical properties of an ultrahigh strength steel (UHSS) friction stir lap welded with Co-based alloy tool was examined. Friction stir lap welding of the UHSS was successfully done at various welding parameters. A decrease in rotational speed decreased fraction of martensite and hardness in the stir zone. Tensile shear load of the weld increased with decreasing the rotational speed. In the welds produced at the high rotational speed, crack was initiated from the tip of the lapped interface and then propagated into the stir zone having high fraction of martensite, possibly resulting from the stress concentration. On the other hand, the welds produced at the low rotational speed failed in the softest region of the heat-affected zone. This study showed that the reduced brittleness of the stir zone arising from the low rotational speed was an effective strategy for the superior mechanical properties of the lap welds of the UHSS.

本文言語英語
ホスト出版物のタイトルFriction Stir Welding and Processing XII
編集者Yuri Hovanski, Yutaka Sato, Piyush Upadhyay, Anton A. Naumov, Nilesh Kumar
出版社Springer Science and Business Media Deutschland GmbH
ページ99-106
ページ数8
ISBN(印刷版)9783031226601
DOI
出版ステータス出版済み - 2023
イベント12th Symposium on Friction Stir Welding and Processing, held at the TMS Annual Meeting and Exhibition, TMS 2023 - San Diego, 米国
継続期間: 2023 3月 192023 3月 23

出版物シリーズ

名前Minerals, Metals and Materials Series
ISSN(印刷版)2367-1181
ISSN(電子版)2367-1696

会議

会議12th Symposium on Friction Stir Welding and Processing, held at the TMS Annual Meeting and Exhibition, TMS 2023
国/地域米国
CitySan Diego
Period23/3/1923/3/23

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