STP888

    Development of Small Punch Tests for Ductile-Brittle Transition Temperature Measurement of Temper Embrittled Ni-Cr Steels

    Published: Jan 1986


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    Abstract

    Small punch tests were developed to determine the ductile-brittle transition temperature of nickel-chromium (Ni-Cr) steels having various degrees of temper embrittlement and various microstructures. It was found that the small punch test clearly shows the ductile-brittle transition behavior of the temper-embrittled steels. The measured values were compared with those obtained from Charpy impact and uniaxial tensile tests. The effects of punch tip shape, a notch, and the strain rate on the ductile-brittle transition behavior were examined. It was found that the combined use of a notch, high strain rates, and a small punch tip strongly affects the ductile-brittle transition behavior. Considerable variations in the data were observed when the small punch tests were performed on coarse-grained steels. Several factors controlling embrittlement measurements of steels are discussed in terms of brittle fracture mechanisms.

    Keywords:

    small punch test, ductile-brittle transition temperature, intergranular embrittlement, crack propagation, brittle fracture


    Author Information:

    Baik, J-M
    Ames Laboratory, Iowa State UniversityTristar Semiconductor, Inc., AmesSanta Clara, IACalif.

    Kameda, J
    Ames Laboratory, Iowa State UniversityTristar Semiconductor, Inc., AmesSanta Clara, IACalif.

    Buck, O
    Ames Laboratory, Iowa State UniversityTristar Semiconductor, Inc., AmesSanta Clara, IACalif.


    Paper ID: STP32997S

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP32997S


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