Journal
MATERIALS CHARACTERIZATION
Volume 123, Issue -, Pages 233-243Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.11.029
Keywords
Dissimilar metal welded joint; Microstructure; Residual strain; Narrow-gap GTAW; EBSD
Categories
Funding
- National Natural Science Foundation of China [51301183]
- Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-JSC012]
- Science and Technology Commission of Shanghai Municipality, Shanghai, P R China [14DZ2250300]
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The microstructure, residual strain and interfacial chemical composition distribution of a safe-end dissimilar metal weld joint (DMWJ, SA508-52-316L) prepared by narrow-gap gas-tungsten arc welding (NG-GTAW) were studied by optical microscope (OM) and scanning electron microscope equipped with an energy dispersive X-ray microanalysis (SEM/EDX) and an electron back scattering diffraction (EBSD) system. Complex microstructure and chemical composition distribution are found, especially at the SA508-52 interface and the 52-316L interface. In brief, a complicated microstructure transition exists within the SA508 heat affected zone (HAZ); the residual strain, the fraction of high angle random grain boundaries and low angle boundaries decrease with increasing the distance from the fusion boundary in 316L HAZ; neither typical type II boundary nor obvious carbon-depleted zone is found near the SA508-52 interface; dramatic and complicated changes of the contents of the main elements, Fe, Cr and Ni, are observed at the distinct interfaces, especially at the SA508-52 interface. No carbon concentration is found at the SA508-52 interface. (C) 2016 Elsevier Inc. All rights reserved.
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