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Suppression of creep cavitation in precipitation-hardened austenitic stainless steel to enhance creep rupture strength

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Abstract

Extensive creep cavitation in Ti, Nb and Cu containing precipitation hardened austenitic steels was found to limit the usefulness of deformation resistance to increase long-term creep rupture strength. The steels were microalloyed with boron and cerium that resulted in increase in creep rupture strength and ductility of the steels significantly. Grain boundary sliding and creep cavity nucleation and growth in the steels were suppressed greatly on microalloying. Auger spectroscopic analysis revealed the segregation of boron instead of sulfur on cavity surface and the absence of sulfur contamination of grain boundary upon the microalloying. Suppression of creep cavitation through the control of trace elements segregation along with the precipitation hardening increased the creep rupture strength of austenitic stainless steels.

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Authors and Affiliations

  1. Mechanical Metallurgy Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India

    K. Laha

  2. Materials Engineering Laboratory, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan

    J. Kyono & N. Shinya

Authors
  1. K. Laha
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  2. J. Kyono
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  3. N. Shinya
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Correspondence to K. Laha.

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Laha, K., Kyono, J. & Shinya, N. Suppression of creep cavitation in precipitation-hardened austenitic stainless steel to enhance creep rupture strength. Trans Indian Inst Met 63, 437–441 (2010). https://doi.org/10.1007/s12666-010-0060-7

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  • DOI: https://doi.org/10.1007/s12666-010-0060-7

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