STP756

    Metallurgical Characteristics of a Large Hydraulic Runner Casting of Type 13Cr-Ni Stainless Steel

    Published: Jan 1982


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    Abstract

    Increasing the size of type 13 Cr-Ni martensitic stainless steel castings with complicated cross sections results in difficulty in obtaining a uniform temperature distribution during thermal treatment, which in turn leads to a critical condition for cracking, in addition to deterioration of impact properties due to slow cooling. Chromium carbides (Cr23C6) precipitated by slow cooling through the austenite region at prior austenite or δ-ferrite grain boundaries cause an adverse effect on toughness, giving mosaic-like intergranular failure. Reducing silicon and carbon, along with the addition of molybdenum, improves toughness as the result of suppressing the Cr23C6 precipitate. Toughness degradation due to slow cooling from the tempering temperature was considered to be associated with the decomposition of interlath-retained austenite and the solubility change of carbon. Lowering the silicon content and the addition of molybdenum lessen the toughness deterioration.

    Keywords:

    grain boundary failure, material deterioration, carbide precipitate, mosaic-like mark, toughness degradation, interlath-retained austenite decomposition, carbon solubility, stability


    Author Information:

    Iwabuchi, Y
    Senior metallurgist and manager, Research Laboratory, The Japan Steel Works, Ltd., MuroranHokkaido,

    Sawada, S
    Senior metallurgist and manager, Research Laboratory, The Japan Steel Works, Ltd., MuroranHokkaido,


    Paper ID: STP28449S

    Committee/Subcommittee: A01.18

    DOI: 10.1520/STP28449S


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