Abstract
Residual strain distributions in similar and dissimilar welds were measured using the neutron diffraction (ND) method. Then, using three strain components, three-dimensional stress states were calculated. The results were used to determine the effect of the martensitic phase transformation and material properties on residual stress (RS) distribution. It was observed that smaller longitudinal RS was induced in the low-carbon steel side of the dissimilar weld when compared to its similar weld. Also, it was found that the transverse RS near and within the weld zone (WZ) in the dissimilar weld exhibited a distinctive trend, with tensile mode reaching the yield strength of the base metal (BM). In order to characterize the WZ in the dissimilar weld, optical microscopy, hardness tests, and energy dispersive x-ray spectroscopy (EDAX) were employed. This study not only provides further insight into the RS state in similar and dissimilar welds, it also delivers important consequences of phase transformation in the latter case.
Original language | English |
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Pages (from-to) | 111-119 |
Number of pages | 9 |
Journal | Welding Journal |
Volume | 95 |
Issue number | 4 |
State | Published - Apr 2016 |
Funding
A portion of this research at ORNL's High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. The authors also gratefully acknowledge the support of Andrew Payzant, Paris Cornwell, and Lindsay Kolbus for assistance with neutron diffraction measurement at ORNL.
Keywords
- Dissimilar Weld
- Neutron Diffraction
- Residual Strain and Stress