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Temper embrittlement in a 3-pct Cr-Mo turbine disc steel

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Abstract

The kinetics of isothermal temper embrittlement have been studied in a 3 pet Cr-Mo turbine disc steel at tempering temperatures from 450 to 580‡C. In the cast examined embrittlement results principally from the segregation of phosphorus to prior austenite grain boundaries and it is shown that the present results are consistent with an equilibrium segregation process. These data have been used to predict the degree of embrittlement resulting from continuous cooling from the tempering temperature and the results have been compared with laboratory tests for a wide range of cooling rates. The probable effect of post-tempering cooling rate on toughness and the feasibility of using retempering treatments as a means of rehabilitating temper embrittled components are also considered.

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Authors and Affiliations

  1. Central Electricity Generating Board, UK

    B. L. King (Research Officer) & G. Wigmore (Research Officer)

  2. Central Electricity Research Laboratories, Materials Divi-sion, Leatherhead, Surrey, England

    B. L. King (Research Officer)

  3. South Western Region Scientific Services Department, Bristol, Avon, England

    G. Wigmore (Research Officer)

Authors
  1. B. L. King
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  2. G. Wigmore
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King, B.L., Wigmore, G. Temper embrittlement in a 3-pct Cr-Mo turbine disc steel. Metall Trans A 7, 1761–1767 (1976). https://doi.org/10.1007/BF02817894

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  • DOI: https://doi.org/10.1007/BF02817894

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