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Kinetics and hardening mechanism of the 475°C embrittlement in 18Cr-2Mo ferritic steels

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Abstract

The kinetics of the 475°C embrittlement of a Ti-stabilized 18 Cr-2 Mo ferritic steel have been studied by the measurement of hardness and tensile properties. The results are in accordance with the Cottrell-Bilby-Harper theory for precipitation on dislocations. The high increase in proof stress (∼400 MN/m2) is suggested to depend largely on the precipitation of chromium-rich ά-ferrite in subgrain boundaries, in that this increases the subgrain contribution to the stress by a Hall-Petch type of mechanism.

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Authors and Affiliations

  1. Swedish Institute for Metal Research, Stockholm, Sweden

    P. Jacobsson, Y. Bergström & B. Aronsson

Authors
  1. P. Jacobsson
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  2. Y. Bergström
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  3. B. Aronsson
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Formerly Director of the Institute is now Director of Steel Research, Uddeholms AB, Sweden.

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Jacobsson, P., Bergström, Y. & Aronsson, B. Kinetics and hardening mechanism of the 475°C embrittlement in 18Cr-2Mo ferritic steels. Metall Trans A 6, 1577 (1975). https://doi.org/10.1007/BF02641970

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