Niobium Carbo-Nitride Precipitation Behavior in a High Nitrogen 15Cr-15Ni Heat Resistant Austenitic Stainless Steel
- Niobium Carbo-Nitride Precipitation Behavior in a High Nitrogen 15Cr-15Ni Heat Resistant Austenitic Stainless Steel
- Vu The Ha; 정우상
- niobium carbo-nitride; precipitation; 15Cr-15Ni; creep; aging
- Issue Date
- Metals and Materials International
- VOL 17, NO 5, 713-720
- A high nitrogen 15Cr-15Ni niobium-stabilized austenitic alloy has been produced and subjected to a special
heat treatment consisting of 5 hours of solution treatment at 1270 °C followed by hot rolling, quenching
and subsequent aging at temperatures of 700 °C to 800 °C. It was found that fine dispersion of nano-sized
thermally stable primary Nb(C,N) precipitates had already formed in the as-cast condition. The particles were
presented at all examined stages of the TMT process (as-homogenized, as-solution treated and as-aged conditions).
Secondary precipitates Nb(C,N) were densely formed during subsequent aging; these precipitates
had sizes of 4 nm to 5 nm. Both the primary and secondary Nb(C,N) particles showed excellent thermal
stability within the temperature range of 700 °C to 800 °C. The creep properties of the studied alloy at 750 °C
were superior when compared to those of commercial type 347 stainless steel.
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