Characterization of residual stress as a function of friction stir welding parameters in oxide dispersion strengthened (ODS) steel MA956

L. N. Brewer; M. S. Bennett; B. W. Baker; E. A. Payzant; L. M. Sochalski-Kolbus

doi:10.1016/j.msea.2015.09.020

Characterization of residual stress as a function of friction stir welding parameters in oxide dispersion strengthened (ODS) steel MA956

L. N. Brewer, M. S. Bennett, B. W. Baker, E. A. Payzant, L. M. Sochalski-Kolbus

Materials Engineering

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

Friction stir welding (FSW) can generate large residual stresses during solid state joining of oxide dispersion strengthened steels. In this work, a plate of MA956 steel was friction stir welded at three conditions: 500 rpm/25 mm per minute (mmpm), 400 rpm/50 mmpm and 400 rpm/100 mmpm. The residual stresses across these welds were measured using both x-ray and neutron diffraction techniques. The distribution and magnitude of the residual stresses agreed well between the two techniques. Longitudinal residual stresses up to eighty percent of the yield strength were observed for the 400 rpm/100 mmpm condition. The surface residual stresses were somewhat larger on the root side of the weld than on the crown side. Increases in the relative heat input during FSW decreased the measured residual stresses in the stir zone and the thermomechanically affected zone (TMAZ). Increasing the traverse rate while holding the rotational speed fixed increased the residual stress levels. The fatigue strength of the material is predicted to decrease by at least twenty percent with cracking most likely in the TMAZ.

Original language	English
Pages (from-to)	313-321
Number of pages	9
Journal	Materials Science and Engineering: A
Volume	647
DOIs	https://doi.org/10.1016/j.msea.2015.09.020
State	Published - Oct 28 2015

Funding

This work was performed in part under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. The two plates measured in this study were provided by Lawrence Livermore National Laboratories . We are grateful for technical assistance from Dr. E.S.K. Menon at NPS and Dr. M. Mahoney at MegaStir Technologies. Research conducted at ORNL's High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy.

Funders	Funder number
Office of Basic Energy Sciences
Scientific User Facilities Division
US Department of Energy
U.S. Department of Energy
Lawrence Livermore National Laboratory	DE-AC52-07NA27344

Keywords

Friction stir welding
Neutron diffraction
ODS steel
Residual stress
X-ray diffraction

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10.1016/j.msea.2015.09.020

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title = "Characterization of residual stress as a function of friction stir welding parameters in oxide dispersion strengthened (ODS) steel MA956",

abstract = "Friction stir welding (FSW) can generate large residual stresses during solid state joining of oxide dispersion strengthened steels. In this work, a plate of MA956 steel was friction stir welded at three conditions: 500 rpm/25 mm per minute (mmpm), 400 rpm/50 mmpm and 400 rpm/100 mmpm. The residual stresses across these welds were measured using both x-ray and neutron diffraction techniques. The distribution and magnitude of the residual stresses agreed well between the two techniques. Longitudinal residual stresses up to eighty percent of the yield strength were observed for the 400 rpm/100 mmpm condition. The surface residual stresses were somewhat larger on the root side of the weld than on the crown side. Increases in the relative heat input during FSW decreased the measured residual stresses in the stir zone and the thermomechanically affected zone (TMAZ). Increasing the traverse rate while holding the rotational speed fixed increased the residual stress levels. The fatigue strength of the material is predicted to decrease by at least twenty percent with cracking most likely in the TMAZ.",

keywords = "Friction stir welding, Neutron diffraction, ODS steel, Residual stress, X-ray diffraction",

author = "Brewer, {L. N.} and Bennett, {M. S.} and Baker, {B. W.} and Payzant, {E. A.} and Sochalski-Kolbus, {L. M.}",

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AU - Brewer, L. N.

AU - Bennett, M. S.

AU - Baker, B. W.

AU - Payzant, E. A.

AU - Sochalski-Kolbus, L. M.

PY - 2015/10/28

Y1 - 2015/10/28

N2 - Friction stir welding (FSW) can generate large residual stresses during solid state joining of oxide dispersion strengthened steels. In this work, a plate of MA956 steel was friction stir welded at three conditions: 500 rpm/25 mm per minute (mmpm), 400 rpm/50 mmpm and 400 rpm/100 mmpm. The residual stresses across these welds were measured using both x-ray and neutron diffraction techniques. The distribution and magnitude of the residual stresses agreed well between the two techniques. Longitudinal residual stresses up to eighty percent of the yield strength were observed for the 400 rpm/100 mmpm condition. The surface residual stresses were somewhat larger on the root side of the weld than on the crown side. Increases in the relative heat input during FSW decreased the measured residual stresses in the stir zone and the thermomechanically affected zone (TMAZ). Increasing the traverse rate while holding the rotational speed fixed increased the residual stress levels. The fatigue strength of the material is predicted to decrease by at least twenty percent with cracking most likely in the TMAZ.

AB - Friction stir welding (FSW) can generate large residual stresses during solid state joining of oxide dispersion strengthened steels. In this work, a plate of MA956 steel was friction stir welded at three conditions: 500 rpm/25 mm per minute (mmpm), 400 rpm/50 mmpm and 400 rpm/100 mmpm. The residual stresses across these welds were measured using both x-ray and neutron diffraction techniques. The distribution and magnitude of the residual stresses agreed well between the two techniques. Longitudinal residual stresses up to eighty percent of the yield strength were observed for the 400 rpm/100 mmpm condition. The surface residual stresses were somewhat larger on the root side of the weld than on the crown side. Increases in the relative heat input during FSW decreased the measured residual stresses in the stir zone and the thermomechanically affected zone (TMAZ). Increasing the traverse rate while holding the rotational speed fixed increased the residual stress levels. The fatigue strength of the material is predicted to decrease by at least twenty percent with cracking most likely in the TMAZ.

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KW - Neutron diffraction

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KW - Residual stress

KW - X-ray diffraction

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Characterization of residual stress as a function of friction stir welding parameters in oxide dispersion strengthened (ODS) steel MA956

Abstract

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