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The influence of boron on the grain boundary chemistry and microstructure of ni- 16cr- 9fe- 0.03c

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Abstract

High-purity Ni-16Cr-9Fe-0.03C was doped with 50 wppm B in order to determine the effects of B on the grain boundary chemistry and microstructure following both high temperature anneals (1373 to 1473 K) and lower temperature heat treatments (873 to 973 K). The anneals at high temperature yield precipitate-free grain boundaries in the B-free material, while the addition of B results in the intergranular precipitation of B-containing M7X3 and M23X6 and a 30 to 50 Pct reduction in grain growth. The low temperature heat treatments of the B-free material result in the growth of intergranular Cr-rich M7C3, which in turn causes Cr depletion at the grain boundary. Adding B does not affect the Cr concentration at the grain boundary nor the width of the Cr-depleted zone. However, B segregation occurs, with a segregation energy of 42.6 kJ/mole. In addition, intergranular Ni + B-rich M23X6 forms. These changes in the grain boundary chemistry due to B cause a reduction in intergranular attack of up to 50 Pct as measured by the electrochemical potentiokinetic reactivation test in a solution of 0.05 M H2SO4 + 0.05 M KSCN.

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Authors and Affiliations

  1. General Electric Company, 94566, Pleasanton, CA

    R. M. Kruger (Seniour Engineer)

  2. Department of Nuclear Engineering, 213 Cooley Building, The University of Michigan, 48109, Ann Arbor, MI

    G. S. Was (Associate Proffessor)

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  1. R. M. Kruger
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  2. G. S. Was
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Formerly with The University of Michigan, Ann Arbor, MI 48109

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Kruger, R.M., Was, G.S. The influence of boron on the grain boundary chemistry and microstructure of ni- 16cr- 9fe- 0.03c. Metall Trans A 19, 2555–2566 (1988). https://doi.org/10.1007/BF02645483

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