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|標題:||Precipitation behavior of sigma phase in fusion zone of dissimilar stainless steel welds during multi-pass GTAW process||作者:||Hsieh, C.C.
|關鍵字:||sigma phase;fusion zone;delta-ferrite;delta ->sigma + gamma(2);multi-pass welding;microstructural stability;corrosion-resistance;aging treatments;toughness;kinetics;nickel||Project:||Metals and Materials International||期刊/報告no：:||Metals and Materials International, Volume 13, Issue 5, Page(s) 411-416.||摘要:||
The purpose of this study is to investigate the precipitation characteristics of a 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 delta-ferrite and sigma 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 delta-ferrite was observed in the fusion zone of the first pass welds during welding of dissimilar stainless steels. The a phase precipitated at the inner delta-ferrite particles and decreased delta-ferrite content during the third pass welding. The sigma and delta phases can be stabilized by Si element, which promoted the phase transformation of delta ->sigma+gamma(2) in the fusion zone of the third pass welds. It was found that the sigma phase was a Fe-Cr-Si intermetallic compound found in the fusion zone of the third pass welds during multi-pass welding.
|Appears in Collections:||材料科學與工程學系|
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