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An ATEM study of the precipitation of secondary phases in the temperature range of 600-800 degrees Celsius was undertaken for two P/M-HIP super duplex stainless steel grades. It was shown that main secondary phase precipitating after the aging treatment at 600 degrees Celsius for 10 h is R phase, at 700 degrees Celsius for 2 h chi phase, and at 800 degrees Celsius for 30 min sigma phase, respectively. The corrosion resistance of duplex stainless steels was analyzed from the point of view of the morphology and composition of the precipitating phases. It was also shown that aging treatment of copper-containing duplex steel results il1 precipitation of Cu-rich particles. The effects of the precipitated copper particles on corrosion and mechanical properties of the steel are discussed, as well as their possible indirect effects via inter-metallic phases.

Additional information

Authors: SMUK O, Laboratory of Engineering Materials, Helsinki University of Technology (FI);HNNINEN H, Laboratory of Engineering Materials, Helsinki University of Technology (FI);NENONEN P, JRC-Institute for Advanced Materials, Petten (NL)
Bibliographic Reference: An oral report given at: the 10th International Symposium on Corrosion in the Pulp and Paper Industry. Held in: Helsinki Finland, 21-24 August 2001
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