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The cooperative relation between temper embrittlement and hydrogen embrittlement in a high strength steel

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Abstract

A sample plate of HY 130 steel (5 pet Ni-0.5 pet Cr-0.5 pet Mo-0.1 pet V-0.1 pet C) was found to be quite susceptible to temper embrittlement. Step-cooling produced a shift in transition temperature of 583 K (310°C). In the step-cooled condition the plane strain stress intensity threshold for crack growth in 0.1 N H2SO2 was about 22 MNm-3/2 (20 ksi √in. ) and the fracture mode was inter granular, whereas in the unembrittled condition the threshold for a 1.27 cm (1/2 in.) plate (not fully plane strain) was around 104.5 MNm-3/2 (95 ksi Vin. ) and the fracture mode was mixed cleavage and microvoid coalescence. The interaction between the impurity-induced and the hydrogen embrittlement is discussed in terms of Oriani’s theory of hydrogen embrittlement.

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Authors and Affiliations

  1. Kamaishi Works, Nippon Steel Corporation, Kamaishi, Iwate, Japan

    Kenichiro Yoshino (Assistant Manager)

  2. Department of Metallurgy and Materials Science, University of Pennsylvania, 19174, Philadelphia, Pa.

    C. J. McMahon (Associate Professor)

Authors
  1. Kenichiro Yoshino
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  2. C. J. McMahon
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Formerly Research Fellow, Department of Metallurgy and Materials Science, University of Pennsylvania

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Yoshino, K., McMahon, C.J. The cooperative relation between temper embrittlement and hydrogen embrittlement in a high strength steel. Metall Trans 5, 363–370 (1974). https://doi.org/10.1007/BF02644103

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