Evaluation of residual stresses in isothermal friction stir welded 304L stainless steel plates

Bhattacharyya, Madhumanti; Gnaupel-Herold, Thomas; Gnaupel-Herold, Thomas; Raja, Krishnan; Darsell, Jens T.; Jana, Saumyadeep; Charit, Indrajit

doi:10.1016/j.msea.2021.141982

Evaluation of residual stresses in isothermal friction stir welded 304L stainless steel plates

Journal Article · 05 October 2021 · Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2021.141982· OSTI ID:1827271

Bhattacharyya, Madhumanti ^[1]; Gnaupel-Herold, Thomas ^[2]; Gnaupel-Herold, Thomas ^[2]; Raja, Krishnan ^[1]; Darsell, Jens T. ^[3]; Jana, Saumyadeep ^[3]; Charit, Indrajit ^[1]

University of Idaho
NIST
BATTELLE (PACIFIC NW LAB)

Friction stir welding was performed on 304L SS plates in order to heal simulated cracks created by electrical discharge machining. Two different tool temperatures (825 and 725 °C) were chosen for this study. Both neutron diffraction and X-ray diffraction techniques were employed to evaluate the residual stresses along two orthogonal reference directions, longitudinal (syy) and transverse (sxx). The former technique was also used to measure residual stresses at various depths. It was found that, at 1 mm depth from the top surface inside the stir zone (SZ), the longitudinal component was tensile in nature while the transverse component was compressive. The nature and magnitude of the residual stress fields, and the position of the peak residual stresses were found to vary with the weld depth. The SZ of the 725 °C weld exhibited higher peak stress than 825 °C weld mainly due to a lack of stress relief at the lower temperature.

Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1827271

Report Number(s):: PNNL-SA-166853

Journal Information:: Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing, Vol. 826

Country of Publication:: United States

Language:: English

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