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The effect of step quenching on the microstructure and fracture toughness of aisi 4340 steel

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Abstract

The microstructure and fracture toughness of AISI 4340 steel in the direct and in the step quenched and tempered condition has been studied. Austenitizing temperatures of 1473 K followed by step quenching to either 1373 or 1143 K prior to oil quenching have been employed. A consistent drop in the fracture toughness values was observed as the intermediate holding temperature decreased or the holding time at this temperature in-creased. A concurrent increase in the amount of twinning was seen without any change in the amount and/or distribution of retained austenite. While direct evidence for segre-gation has not been found, the observed facts are consistent with segregation effects during the austenitizing treatment.

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Authors and Affiliations

  1. Dept. of Materials Science, Oregon Graduate Center, 97005, Beaverton, OR

    Khalid H. Khan (Research Associate-Lecturer) & William E. Wood (Associate Professor)

Authors
  1. Khalid H. Khan
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  2. William E. Wood
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Khan, K.H., Wood, W.E. The effect of step quenching on the microstructure and fracture toughness of aisi 4340 steel. Metall Trans A 9, 899–907 (1978). https://doi.org/10.1007/BF02649833

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  • DOI: https://doi.org/10.1007/BF02649833

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