Ferrite to austenite reverse transformation process in B containing 9%Cr heat resistant steel HAZ

T. Shirane, S. Tsukamoto, K. Tsuzaki, Y. Adachi, T. Hanamura, M. Shimizu, F. Abe

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Creep properties, HAZ microstructure Creep properties of the high Cr heat resistant steel welded joint can be improved by adding B due to prevention of the grain refinement in heat affected zone (HAZ). In the present study, phase transformation behaviour of the B steel HAZ has been investigated to understand suppression mechanism of the grain refinement. During reverse transformation, fine austenite was formed through diffusional transformation at the prior austenite grain boundary in the first stage, and then coarse austenite was formed at the same location of the original austenite. The volume fraction of the fine austenite increased with increasing perk temperature of the weld thermal cycle. This phenomenon can be explained if the coarse austenite contains high density of dislocations. Clear surface relief was observed during the reverse transformation by a confocal laser microscope. These results indicate that martensitic or displacive reverse transformation takes place during welding and it prevents the grain refinement in HAZ.

Original languageEnglish
Pages (from-to)698-707
Number of pages10
JournalScience and Technology of Welding and Joining
Volume14
Issue number8
DOIs
Publication statusPublished - Nov 1 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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