Characterization of Multilayered Multipass Friction Stir Weld on ASTM A572 G50 Steel

Lim, Yong Chae; Sanderson, Samuel; Mahoney, Murray; Yu, Xinghua; Qiao, Dongxiao; Wang, Yanli; Zhang, Wei; Feng, Zhili

Title: Characterization of Multilayered Multipass Friction Stir Weld on ASTM A572 G50 Steel

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Abstract

A multilayered multipass friction stir weld (MM-FSW) on ASTM A572 Grade 50 steel was characterized to understand its potential application for thick-section structures. The 15-mm-thick section was fabricated by stacking up three steel plates and then friction stir welding the plates together in a total of 5 passes. The unique butt/lap joint configuration encountered in the multilayer weld was examined to understand the effect of tool rotation direction on the joint quality especially the formation of hooking defect. Charpy V-notch impact toughness tests showed generally higher impact toughness energy for the stir zone than the base metal with a ductile fracture mode. The microhardness value was measured from 195 to 220 HV in the stir zone, while the base metal showed an average value of 170 HV. The microstructure in the stir zone and the adjacent heat affected zone was quantified using Optical and Scanning Electron Microscopy (SEM) including Electron Backscatter Diffraction (EBSD). The increased toughness and hardness were correlated with the refined microstructure in stir zone, resulting from severe plastic deformation and subsequent dynamic recrystallization during friction stir welding.

Authors:

Lim, Yong Chae ^[1]; Sanderson, Samuel ^[2]; Mahoney, Murray ^[3]; Yu, Xinghua ^[1]; Qiao, Dongxiao ^[1]; Wang, Yanli ^[1]; Zhang, Wei ^[1]; Feng, Zhili ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
MegaStir Technologies LLC, Provo, UT (United States)
Consultant, Midway, UT (United States)

Publication Date:: 2014-01-01

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1185361

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Welding Journal

Additional Journal Information:: Journal Volume: 93; Journal Issue: 12; Journal ID: ISSN 0043-2296

Publisher:: American Welding Society

Country of Publication:: United States

Language:: English

Citation Formats


                    Lim, Yong Chae, Sanderson, Samuel, Mahoney, Murray, Yu, Xinghua, Qiao, Dongxiao, Wang, Yanli, Zhang, Wei, and Feng, Zhili. Characterization of Multilayered Multipass Friction Stir Weld on ASTM A572 G50 Steel.  United States: N. p., 2014. 
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                    Lim, Yong Chae, Sanderson, Samuel, Mahoney, Murray, Yu, Xinghua, Qiao, Dongxiao, Wang, Yanli, Zhang, Wei, & Feng, Zhili. Characterization of Multilayered Multipass Friction Stir Weld on ASTM A572 G50 Steel.  United States.

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                    Lim, Yong Chae, Sanderson, Samuel, Mahoney, Murray, Yu, Xinghua, Qiao, Dongxiao, Wang, Yanli, Zhang, Wei, and Feng, Zhili. Wed .  
"Characterization of Multilayered Multipass Friction Stir Weld on ASTM A572 G50 Steel".  United States.  https://www.osti.gov/servlets/purl/1185361.

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@article{osti_1185361,

  title        = {Characterization of Multilayered Multipass Friction Stir Weld on ASTM A572 G50 Steel},

  author       = {Lim, Yong Chae and Sanderson, Samuel and Mahoney, Murray and Yu, Xinghua and Qiao, Dongxiao and Wang, Yanli and Zhang, Wei and Feng, Zhili},

  abstractNote = {A multilayered multipass friction stir weld (MM-FSW) on ASTM A572 Grade 50 steel was characterized to understand its potential application for thick-section structures. The 15-mm-thick section was fabricated by stacking up three steel plates and then friction stir welding the plates together in a total of 5 passes. The unique butt/lap joint configuration encountered in the multilayer weld was examined to understand the effect of tool rotation direction on the joint quality especially the formation of hooking defect. Charpy V-notch impact toughness tests showed generally higher impact toughness energy for the stir zone than the base metal with a ductile fracture mode. The microhardness value was measured from 195 to 220 HV in the stir zone, while the base metal showed an average value of 170 HV. The microstructure in the stir zone and the adjacent heat affected zone was quantified using Optical and Scanning Electron Microscopy (SEM) including Electron Backscatter Diffraction (EBSD). The increased toughness and hardness were correlated with the refined microstructure in stir zone, resulting from severe plastic deformation and subsequent dynamic recrystallization during friction stir welding.},

  doi          = {},

  journal      = {Welding Journal},

  number       = 12,

  volume       = 93,

  place        = {United States},

  year         = {2014},

  month        = {1}

}

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