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Granular product in a high strength, low alloy containing molybdenum and niobium

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Abstract

The formation and microstructure of the granular product and its effect on the mechanical properties of a high-strength, low alloy steel containing molybdenum and niobium have been investigated. It was found that the granular product “islands” are composed of both twinned martensite and dislocated martensite. The effect of the granular “islands” on the strength at room temperature and at 400 °C has been determined. The results showed that the strength increased and both the impact and fracture toughness decreased as the volume fraction of granular “islands” was increased.In situ fracture studies indicated that the three stages of the microfracture process of the specimen containing granular “islands” are the initiation of voids at interfaces between the granular “islands” and the bainitic ferrite matrix, followed by void growth and finally, coalescence by shear.

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Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Science, Shenyang, People’s Republic of China

    Y. B. Xu (Associate Professor) & T. Y. Zhang (Engineer)

  2. Anshan Institute of Iron and Steel, Anshan Iron and Steel Company, Anshan Liaoning, People’s Republic of China

    G. J. Liu (Engineer)

Authors
  1. Y. B. Xu
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  2. G. J. Liu
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  3. T. Y. Zhang
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Xu, Y.B., Liu, G.J. & Zhang, T.Y. Granular product in a high strength, low alloy containing molybdenum and niobium. Metall Trans A 18, 1923–1927 (1987). https://doi.org/10.1007/BF02647022

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  • DOI: https://doi.org/10.1007/BF02647022

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