Abstract
In the study reported in this paper we investigated the development of a dislocation substructure of type AISI 304 stainless steel during deformation in uniaxial tension at 650 °C and a nominal strain rate of 3.17 × 10 −4 s −1. Transmission electron microscopy showed dislocation cell formation at an earlier stage ( i.e. at a lower strain) than for creep at the same temperature and a decreasing cell size with increasing strain up to necking. The cell size affected the room temperature microhardness, which is consistent with earlier work, and is an important microstructural aspect determining the subsequent deformation behavior. A brief comparison of microstructures from hot hardness indentations and the present hot tensile specimens supports the validity of estimating tensile parameters from hardness data.
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