Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam.
作者： Sergey Vyacheslavovich Kuryntsev
DOI: 10.3390/MA12223720
关键词:
摘要: The effect of heat treatment welded joints made steel 321 on corrosion resistance, phase composition, residual stresses, and distribution alloying elements was studied using optical microscope (OM) scanning electron (SEM), dispersive spectroscopy (EDS), X-ray diffraction (XRD), intergranular testing (IGC). Samples previously obtained by the authors defocused laser beam, which led to formation directionally crystallized austenite with lathy skeletal δ-ferrite, were investigated. Based studies in base metal, maximum number peaks various phases presented, decreased after exposure heating welding process subsequent treatment. elements, particular, Ti Si, significantly affected depending regimes. A spot chemical analysis showed that nickel content differs δ-ferrite 1.5%–2% whereas chromium these is not different. Tests have shown all samples high resistance corrosion, can be explained insufficient dissolution titanium carbides absence along grain boundaries, due cooling rates when a as result, dissolves.
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