Abstract
The present work concerns the characterisation of intermetallic phases formed in the heat affected zone of a welded superaustenitic stainless steel of composition Fe–0·02C–3Mn–24Cr–7·3Mo–22No–0·5Cu–0·5N (wt-%). Grain boundary precipitates at various distances from the fusion line have been investigated regarding crystal structures, compositions, and particle morphologies. A correlation of precipitation with the temperature history recorded in the heat affected zone was also performed. Two different precipitates, σ and R, were detected in the heat affected zone. These precipitates were evenly distributed along grain boundaries and had platelike shapes with typical lengths of 200–900 nm and 30–300 nm for σ and R, respectively. Near the fusion line, coexistence of R and σ phases was observed but, at larger distances, only R phase was found, indicating a lower temperature of formation for this phase.
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