Effects of insoluble carbide on microstructure and hardness of martensitic stainless steels

Toshihiro Tsuchiyama, Setsuo Takaki, Sadayuki Nakamura

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    12 Citations (Scopus)

    Abstract

    The Effects of insoluble carbide on the microstructure and hardness of martensitic stainless steels were investigated in 12%Cr-(0.1approx.0.4%)C steels. In high carbon steels, carbide does not dissolve into austenite fully at a solution treatment temperature around 1300K and the insoluble carbide affects the mechanical properties of martensite at room temperature. By means of hardness testing in specimens solution-treated at different temperatures (T ; K), the solubility of carbon in austenite ([C] ; mass%)was given by the equation ; log [C] = -6100/T + 4.1. The relation between volume fraction of insoluble carbide (F ; vol%) and carbon content of steels (C ; mass%) was given by the equation ; F = 20(C-[C]) by taking the densities of carbide and martensite into consideration. The contribution of insoluble carbide was added to the hardness of martensite matrix, so that the hardness of martensitic steels with insoluble carbide (Hv) was represented by the equation ; Hv = 25 + 1250√[C] + 500(C-[C]).

    Original languageEnglish
    Pages (from-to)938-943
    Number of pages6
    JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    Volume80
    Issue number12
    DOIs
    Publication statusPublished - 1994

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Metals and Alloys
    • Materials Chemistry

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