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Creep rupture strength and grain-boundary sliding in austenitic 21 Cr-4Ni-9Mn steels with serrated grain boundaries

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Abstract

The effect of grain-boundary strengthening on the creep-rupture strength by modification of the grain-boundary configuration is studied using austenitic 21 Cr-4Ni-9Mn steel in the temperature range from 600 to 1000° C in air. Grain-boundary sliding is also examined on a steel with serrated grain boundaries during creep at 700° C. The improvement of creep-rupture strength by the strengthening of grain boundaries is observed at high temperatures above 600° C. The 1000 h rupture strength of steels with serrated grain boundaries is considerably higher than that of steels with straight grain boundaries, especially at 700 and 800° C. The strengthening by serrated grain boundaries is effective in retarding both the crack initiation and the crack propagation at 700° C, while it does not improve the life to crack initiation at 900° C. Grain-boundary sliding is considerably inhibited by the strengthening of grain boundaries at 700° C. The amount of it in steels with serrated grain boundaries is less than about one-third of that of steels with straight grain boundaries at the same creep strain. The stress dependence of grain-boundary sliding rate in the steady-state regime is also examined from the steels with these two types of grain-boundary configuration.

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Authors and Affiliations

  1. Department of Mechanical Engineering for Production, Mining College, Akita University, 1-1, Tegatagakuen-cho, Akita, 010, Japan

    Manabu Tanaka, Hiroshi Iizuka & Fumio Ashihara

  2. Department of Mechanical Engineering, Faculty of Technology, Tokyo Metropolitan University, 2-1-1, Fukasawa, 158, Setagaya-ku, Tokyo, Japan

    Ohmi Miyagawa & Tsuneaki Sakaki

  3. Nittan Valve Corporation Ltd, 2-7-2, Yaesu, Chuou-ku, 104, Tokyo, Japan

    Dai Fujishiro

Authors
  1. Manabu Tanaka
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  2. Ohmi Miyagawa
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  3. Tsuneaki Sakaki
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  4. Hiroshi Iizuka
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  5. Fumio Ashihara
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  6. Dai Fujishiro
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Tanaka, M., Miyagawa, O., Sakaki, T. et al. Creep rupture strength and grain-boundary sliding in austenitic 21 Cr-4Ni-9Mn steels with serrated grain boundaries. J Mater Sci 23, 621–628 (1988). https://doi.org/10.1007/BF01174696

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  • DOI: https://doi.org/10.1007/BF01174696

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