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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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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DOI: https://doi.org/10.1007/BF02644103