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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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