Microcracking and fatigue in a carburized steel View Full Text


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Article Info

DATE

1973-05

AUTHORS

C. A. Apple, G. Krauss

ABSTRACT

A carburized coarse-grained AISI 8620 steel was subjected to three postcarburization heat treatments: a) direct oil quench from the carburizing temperature (1700°F), b) direct oil quench, reheat to 1550°F and oil quench, and c) slow cool, reheat to 1550°F and oil quench, reheat to 1450°F and oil quench. The latter two treatments refined the austenitic grain size over that resulting from the direct quench and caused a reduction in the size of the marten-site plates and of the number and/or size of the microcracks within the plates. The refine-ment of the microstructure and the reduction of the number of microcracks resulted in greatly improved fatigue resistance,i.e., from fatigue limits of 140 to 250 ksi maximum cyclic stress for the direct quench and double reheat conditions, respectively. Subcritical crack growth was transgranular, but the mode of unstable crack propagation was mixed transgranular and intergranular in the direct quench and single reheat specimens. Obser -vations of microcrack coalescence and fracture surface features suggest that microcracks are instrumental in the transgranular mode of failure. More... »

PAGES

1195-1200

References to SciGraph publications

  • 1972-01. Effect of dissolved carbon on microcracking in martensite of an Fe-1.39 C alloy in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1972-01. Microcracking in ferrous martensites in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1972-07. The development of martensitic microstructure and microcracking in an Fe-1.86C alloy in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1970-06. Microcracking sensitivity in Fe-C plate martensite in NONE
  • Journal

    TITLE

    Metallurgical Transactions A

    ISSUE

    5

    VOLUME

    4

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf02644511

    DOI

    http://dx.doi.org/10.1007/bf02644511

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1007770314


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