Importance of austenitization temperature and ausforming on creep strength in 9Cr ferritic/martensitic steel
Importance of austenitization temperature and ausforming on creep strength in 9Cr ferritic/martensitic steel
Vivas, J.; Capdevila, C.; Altstadt, E.; Houska, M.; San-Martin, D.
Abstract
Small Punch Creep technique was used as a screening procedure to evaluate the creep properties of different microstructures developed in a thermomechanical simulator. The goal seek was to generate alternative microstructures in a conventional ferritic-martensitic G91 steel grade which boost thermal stability at temperatures as high as 700ºC. The developed microstructures allow studying the effect of the austenitization temperature optimized by thermodynamic calculations and the ausforming on the creep strength and ductility. The improvement in creep strength recorded was attributable to a higher number density of MX precipitates. By contrast, these microstructures showed an important reduction in creep ductility.
Keywords: Small Punch Creep Tests; MX nanoprecipitates; creep ductility; ausforming; creep resistant steels
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Scripta Materialia 153(2018), 14-18
DOI: 10.1016/j.scriptamat.2018.04.038
Cited 29 times in Scopus
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