Creep strengthening by lath boundaries in 9Cr ferritic heat-resistant steel

Masatoshi Mitsuhara, Shigeto Yamasaki, Masaki Miake, Hideharu Nakashima, Minoru Nishida, Junichi Kusumoto, Akihiro Kanaya

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


The interactions between dislocations and lath boundaries in Grade 91 steel were observed by an in situ transmission electron microscopy tensile test at 973 K. Dislocations glided slowly and bowed out in a martensite lath interior. The ends of the dislocation were connected to the lath boundaries. In a tempered specimen, the pinning stress caused by the lath boundary was estimated to be >70 MPa with a lath width of 0.4 m. In crept specimens, lath coarsening reduced the pinning effect.

Original languageEnglish
Pages (from-to)76-83
Number of pages8
JournalPhilosophical Magazine Letters
Issue number2
Publication statusPublished - Feb 1 2016

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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