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Grain boundary misorientation effects on creep and cracking in Ni-based alloys

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Abstract

The effect of altered grain boundary character distributions on the creep and cracking behavior of polycrystalline Ni-16Cr-9Fe at 360°C was studied by comparing the creep and intergranular cracking behavior of solution-annealed material containing mostly high-angle boundaries to material that was thermomechanically processed to enhance the proportion of coincident-site lattice boundaries. In parallel with mechanical testing, the modification of dislocation structures in the grain boundary resulting from reactions with run-in lattice dislocations was studied using transmission electron microscopy. Observations were concerned with the ability of grain boundaries to act as sinks for lattice dislocations in which the kinetics depend on the grain-boundary structure. A mechanism based on dislocation annihilation was proposed to account for the observed effect of the coincident-site lattice boundaries on creep.

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Authors and Affiliations

  1. 1911 Cooley Building, 2355 Bonisteel Boulevard, 48109, Ann Arbor, Michigan

    Gary S. Was

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  1. Gary S. Was
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  2. Visit Thaveeprungsriporn
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  3. Douglas C. Crawford
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Additional information

Gary S. Was earned his Sc.D. in nuclear materials at the Massachusetts Institute of Technology in 1980. He is currently a professor and chair of the Department of of Nuclear Engineering and Radiological Sciences at University of Michigan. Dr. Was is a member of TMS.

Visit Thaveeprungsiporn earned his Ph.D. in nuclear engineering at the University of Michigan in 1966. He is currently a lecturer in the Department of Nuclear Technology, Faculty of Engineering at Chulalongkorn University, Thailand. Dr. Thaveeprungsiporn is also a member of TMS.

Douglas C. Crawford earned his Ph.D. in nuclear engineering at the University of Michigan in 1991. He is currently department manager of fuels technology in the Engineering Division at Argonne National Laboratory.

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Was, G.S., Thaveeprungsriporn, V. & Crawford, D.C. Grain boundary misorientation effects on creep and cracking in Ni-based alloys. JOM 50, 44–49 (1998). https://doi.org/10.1007/s11837-998-0249-y

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