Ferritic phase transformation to improve creep properties of martensitic high Cr steels

Ernst Plesiutschnig, Coline Beal, Christof Sommitsch, Stefan Paul, Günter Zeiler

Research output: Contribution to journalArticle

Abstract

Creep properties of two 9% Cr steels, heat treated based on a quenching and partitioning concept are investigated. Austenite is partly transformed into martensite during interrupted quenching. Due to the new interfaces and the deformed retained austenite, it is possible to transform the retained austenite into ferrite and precipitates during subsequent tempering. The kinetics of this transformation is described by the Kolgomorov-Johnson-Mehl-Avrami equation. Creep rupture times are improved by more than 50% compared to conventional heat treated samples. It is expected that this heat treatment improves the creep properties of the entire class of 8-13% Cr steels.
Original languageEnglish
Pages (from-to)98-101
JournalScripta Materialia
Volume122
DOIs
Publication statusPublished - 2016

Keywords

  • isothermal heat treatments
  • quenching and partitioning
  • phase transformation kinetics
  • martensitic steels
  • creep test

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