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Precipitation Behavior of σ Phase in Fusion Zone of Dissimilar Stainless Steel Welds during Multi-Pass GTAW Process
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Precipitation Behavior of σ Phase in Fusion Zone of Dissimilar Stainless Steel Welds during Multi-Pass GTAW Process
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Journal Article
Precipitation Behavior of σ Phase in Fusion Zone of Dissimilar Stainless Steel Welds during Multi-Pass GTAW Process
2007
Overview
The purpose of this study is to investigate the precipitation characteristics of σ phase in the fusion zone of stainless steel welds at various welding passes during a tungsten arc welding (GTAW) process. The morphology, quantity, and chemical composition of the δ-ferrite and σ phase were analyzed using optical microscopy (OM), a ferritscope (FS), a X-ray diffractometer (XRD), scanning electron microscopy (SEM), an electron probe micro-analyzer (EPMA), and a wavelength dispersive spectrometer (WDS), respectively. Massive δ-ferrite was observed in the fusion zone of the first pass welds during welding of dissimilar stainless steels. The σ phase precipitated at the inner δ-ferrite particles and decreased δ-ferrite content during the third pass welding. The σ and δ phases can be stabilized by Si element, which promoted the phase transformation of δ→σ + γ2 in the fusion zone of the third pass welds. It was found that the σ phase was a Fe-Cr-Si intermetallic compound found in the fusion zone of the third pass welds during multi-pass welding.
Publisher
대한금속재료학회,대한금속·재료학회
Subject
