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Improved creep strength and creep ductility of type 347 austenitic stainless steel through the self-healing effect of boron for creep cavitation

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Abstract

Composition of type 347 austenitic stainless steel was modified with the addition of boron and cerium. An improvement of creep strength coupled with creep ductility of the steel was observed with boron and cerium additions. The observation of enhanced precipitation of carbonitrides in boron-containing steel over that of boron-free steel may in part contribute to the increase in creep strength. Both grain boundary sliding and nucleation and growth of intergranular creep cavities were found to be suppressed in steel-containing boron. This results in an increase in creep strength and creep ductility. Auger electron spectroscopic analysis of the chemistry of creep cavity surfaces (exposed by breaking the creep-exposed steel specimen at liquid nitrogen temperature under impact loading) revealed the segregation of elemental boron on the creep cavity surface. Boron segregation, on the creep cavity surface in the absence of sulfur contamination, suppressed the cavity growth and provided the steel with a self-healing effect for creep cavitation. Cerium additions enabled boron to segregate on the cavity surface by effectively removing the traces of free sulfur in the matrix by the formation of ceriumoxysulfide (Ce2O2S).

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Authors and Affiliations

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

    K. Laha (Science Officer)

  2. the Materials Engineering Laboratory, National Institute for Materials Science, 305-0047, Ibarak, Japan

    J. Kyono (Senior Engineer), T. Sasaki (Research Associate), S. Kishimoto (Senior Researcher) & N. Shinya (Research Fellow)

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  1. K. Laha
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  2. J. Kyono
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  3. T. Sasaki
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  4. S. Kishimoto
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  5. N. Shinya
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Laha, K., Kyono, J., Sasaki, T. et al. Improved creep strength and creep ductility of type 347 austenitic stainless steel through the self-healing effect of boron for creep cavitation. Metall Mater Trans A 36, 399–409 (2005). https://doi.org/10.1007/s11661-005-0311-0

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  • DOI: https://doi.org/10.1007/s11661-005-0311-0

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