Dynamic Restoration Process of Ni-30Fe Alloy during Hot Deformation

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Abstract

Change in deformed microstructure with dynamic restoration at various strain, strain rate and deformation temperature was examined for a Ni-30Fe alloy during hot deformation. A screw embedded specimen is used for quantitative evaluation of the distribution of compressive strain in the hot compressed specimen. A typical microstructural evolution due to dynamic recrystallization is observed at a deformation temperature of 1 173 K at a strain rate of 10/s and at 1 073 K and 1 173 K at a strain rate of 0.1/s. On the other hand, when the compressive strain exceeds 3.2, a characteristic microstructure consisting of equiaxed recovered grains is developed at a deformation temperature of 973 K at a strain rate of 0.1/s and at deformation temperatures of 973 K and 1 073 K at a strain rate of 10/s. The interpenetration of the serrated austenite grain boundaries, so-called geometric recrystallization, is thought to be responsible for microstructural evolution of the equiaxed recovered grains.

Journal

  • ISIJ International

    ISIJ International 42(4), 432-439, 2002-04-15

    The Iron and Steel Institute of Japan

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