Crystallography of Martensite in Friction-Stir-Welded 12Cr Heat-Resistant Steel

Peng Hua, Sergey Mironov, Yutaka S. Sato, Hiroyuki Kokawa, Seung Hwang C. Park, Satoshi Hirano

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this work, electron backscatter diffraction (EBSD) was applied for examination of the crystallography of the martensitic structure produced during friction-stir welding (FSW) of 12Cr heat-resistant steel. The martensitic transformation was found to be governed by the Kurdjumov–Sachs (K-S) relation, viz. {111}γ || {110}α′ and 〈110〉γ || 〈111〉α′, was characterized by substantial variant selection and led to considerable orientation spread within the martensite variants. Due to the latter effect, the K-S model was found to be ineffective for the reconstruction of prior-austenite grain structure. Instead, the mixed orientation relation, viz. {111}γ || {110}α′, 〈110〉γ || 〈111〉α′, and 〈112〉γ || 〈110〉α′, was shown to be more suitable for this purpose.

Original languageEnglish
Pages (from-to)3158-3163
Number of pages6
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number7
Publication statusPublished - 2019 Jul 15


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