Microstructure control for toughening a high carbon martensitic stainless steel

Toshihiro Tsuchiyma, Yoshinori Ono, Setsuo Takaki

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A High carbon martensitic stainless steel (Fe-12%Cr-0.7%C) was subjected to isothermal aging after full solution treatment, and then solution-treated again in the two phase region of austenite and M 23C 6 carbide; partial solution (PS) treatment. Microstructural development during these heat treatment was investigated, and mechanical properties for the PS treated steel were evaluated by comparison with a referencial steel without isothermal aging. During the isothermal aging at 923K, the supercooled austenite undergoes eutectoid transformation and decomposes to ferrite and M 23C 6 carbide, and the carbide particles are finely dispersed within the matrix. Insoluble carbide particles retained during the following PS treatment contribute to suppressing austenite grain growth effectively through the grain boundary pinning effect. Ductile-brittle transition in the PS treated steel is characterized by a lower transition temperature and a higher upper-shelf energy compared with the referencial steel. This is due to the grain refining of prior austenite as well as the homogeneous dispersion of carbide particles through the PS treatment with isothermal aging.

Original languageEnglish
JournalISIJ International
Volume40
Issue numberSUPPL.
Publication statusPublished - 2000

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Martensitic stainless steel
Toughening
Carbon
Steel
Carbides
Microstructure
Austenite
Aging of materials
Grain growth
Superconducting transition temperature
Refining
Ferrite
Grain boundaries
Heat treatment
Mechanical properties

All Science Journal Classification (ASJC) codes

  • Metals and Alloys

Cite this

Microstructure control for toughening a high carbon martensitic stainless steel. / Tsuchiyma, Toshihiro; Ono, Yoshinori; Takaki, Setsuo.

In: ISIJ International, Vol. 40, No. SUPPL., 2000.

Research output: Contribution to journalArticle

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