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Simulation of static and deformation-enhanced grain growth effects on superplastic ductility

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Abstract

The growth of a localized geometric inhomogeneity in a uniaxial test section is simulated through a computer model in which both static(i.e., grain growth in the absence of deformation) and deformation-enhanced grain growth processes are incorporated. The grain growth kinetics are incorporated through a constitutive equation based on the general mechanistic model of superplastic flow, which incorporates a threshold stress as well power-law creep and, therefore, intrinsically results inm varying with strain rate. Results of the simulation indicate a strong effect of the type of test condition, constant strain rate or constant extension rate, on the rate of neck growth ifm varies with strain rate. It is also shown that static grain growth can have a different effect on the neck growth than deformation-enhanced grain growth.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Washington State University, 99164-2920, Pullman, WA

    C. H. Hamilton (Professor)

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  1. C. H. Hamilton
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Hamilton, C.H. Simulation of static and deformation-enhanced grain growth effects on superplastic ductility. Metall Trans A 20, 2783–2792 (1989). https://doi.org/10.1007/BF02670170

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  • DOI: https://doi.org/10.1007/BF02670170

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