Abstract:
Mechanical tests conducted on uniaxial tension confirmed the possibility of visualising areas of plastic deformation using the double-exposure speckle photography method in the initial stages of plastic deformation in Hadfield steel single crystals. The nature of plastic deformation heterogeneity at the stages of easy glide and yield point was examined for a given crystallographic orientation of glide or twinning systems. The data show that in the case of single crystals oriented for singlet glide or twinning, only one focus of localised plasticity arises. In the case of multiple glide, two foci of localised plasticity coexist, the orientation of each of which corresponds to one of the activated glide or twinning systems. The obtained results on deformation heterogeneity must be taken into account when developing the physical mechanisms responsible for achieving high strength properties in austenitic stainless steels.
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