Microstructure and mechanical properties of Al/steel dissimilar welds fabricated by friction surfacing assisted friction stir lap welding

Li Zhou; Mingrun Yu; Baiyang Liu; Zili Zhang; Shuwei Liu; Xiaoguo Song; Hongyun Zhao

Journal of Materials Research and Technology (Jan 2020)

Microstructure and mechanical properties of Al/steel dissimilar welds fabricated by friction surfacing assisted friction stir lap welding

Li Zhou,
Mingrun Yu,
Baiyang Liu,
Zili Zhang,
Shuwei Liu,
Xiaoguo Song,
Hongyun Zhao

Affiliations

Li Zhou: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China; Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China; Corresponding author at: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.
Mingrun Yu: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China; Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China; Joining and Welding Research Institute, Osaka University, Osaka 567-0047, Japan
Baiyang Liu: Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
Zili Zhang: Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
Shuwei Liu: Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
Xiaoguo Song: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China; Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
Hongyun Zhao: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China; Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China

Journal volume & issue: Vol. 9, no. 1
pp. 212 – 221

Abstract

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Al/steel dissimilar welds were obtained by friction stir lap welding (FSLW) with an Al interlayer, which was fabricated by friction surfacing (FS). In present study, the tool pin was totally plunged into the Al plate and interlayer without stirring steel, which avoided the tool wear. The Al plate and interlayer were remarkably intermixed as pin length increased. A diffusion layer, instead of the intermetallic layer, was found at the Al/steel interface, indicating the enhanced atomic migration and related interfacial bonding. The maximum failure load of the joints of 2.8 kN was reached when the 2.5 mm pin tool was used. The heterogeneous microstructure, which was caused by the intermixing, was responsible for the fracture, according to the fracture profiles. Necking and dimples were depicted from the fractographies, indicating that the joints were failed by plastic fracture. Keywords: Al/steel dissimilar joining, Friction surfacing, Friction stir welding, Microstructure, Mechanical properties

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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