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The effect of an intercritical heat treatment on temper embrittlement of a Ni-Cr-Mo-V rotor steel

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Abstract

The effect of an intercritical heat treatment on tempor embrittlement has been investigated for a rotor steel containing 0.25 pct C, 3.5 pct Ni, 1.7 pct Cr, 0.5 pct Mo, 0.1 pct V, and deliberate additions of phosphorus, tin, or antimony. Both martensitic and bainitic steels were held at the intercritical temperature of 1380°F (750°C) for times up to 40 h and were then quenched or cooled to obtain martensitic or bainitic transformation. The steels were then tempered, followed by water quenching or step cooling from the tempering temperature. The residual ferrite maintained a fine plate-like shape even after 40 h at the intercritical temperature. Embrittlement induced by step cooling from the final tempering was mark edly reduced by the intercritical treatment as compared to the embrittlement observed after conventional heat treatment; for example, AFATT, the increase in the Charpy V-notch 50 pct shear fracture transition temperature caused by step cooling, was reduced by at least 80°F (45°C) as a result of the intercritical treatment of steels containing 0.02 pct P. Molybdenum effectively reduced AFATT in intercritlcally heat-treated steels as well as in conventionally treated steels. Possible mechanisms for reducing temper embrittlement with the intercritical treatment are discussed.

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Authors and Affiliations

  1. Research Laboratory, Climax Molybdenum Company of Michigan, a subsidiary of American Metal Climax, Inc., 48105, Ann Arbor, Michigan

    T. Wada (Staff Metallurgist) & D. V. Doane (Manager of Research, Ferrous Metallurgy)

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  1. T. Wada
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  2. D. V. Doane
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Wada, T., Doane, D.V. The effect of an intercritical heat treatment on temper embrittlement of a Ni-Cr-Mo-V rotor steel. Metall Trans 5, 231–239 (1974). https://doi.org/10.1007/BF02642946

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