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Increased fracture toughness in a 300 grade maraging steel as a result of thermal cycling

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Abstract

Systematic changes in the fracture toughness of a 300 grade commercial maraging steel were obtained using a non-standard heat-treating process. Microstructures consisting of variable amounts of retained austenite in an aged martensitic matrix were produced. A mathematical model is presented relating these toughness values to the properties of the individual constituents. Increases in fracture toughness resulting from the non-standard heat-treatment were attributed to the nature of the distribution of the tough phase (retained austenite) in a brittle matrix of precipitation hardened martensite. In some cases, a strain-induced transformation to martensite was observed which greatly added to the toughness. Some improvements in fatigue crack propagation characteristics also resulted from this heat treatment.

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Author information

Authors and Affiliations

  1. Department of Materials Science and Metallurgical Engineering, University of Cincinnati, 45221, Cincinnati, Ohio.

    Stephen D. Antolovich (Associate Professor) & Ashok Saxena (Graduate Research Assistant)

  2. Northrop Aviation Corp., 90250, Hawthorne, Calif.

    G. R. Chanani (Senior Research Engineer)

Authors
  1. Stephen D. Antolovich
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  2. Ashok Saxena
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  3. G. R. Chanani
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Additional information

Formerly Postdoctoral Fellow, Department of Materials Science and Metallurgical Engineering, University of Cincinnati

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Antolovich, S.D., Saxena, A. & Chanani, G.R. Increased fracture toughness in a 300 grade maraging steel as a result of thermal cycling. Metall Trans 5, 623–632 (1974). https://doi.org/10.1007/BF02644658

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  • DOI: https://doi.org/10.1007/BF02644658

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