W. Oliferuk et al., EFFECT OF THE GRAIN-SIZE ON THE RATE OF ENERGY-STORAGE DURING THE TENSILE DEFORMATION OF AN AUSTENITIC STEEL, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 197(1), 1995, pp. 49-58
The effect of the grain size on the energy storage process in a low ca
rbon austenitic steel deformed in tension is studied. The energy conve
rsion at each instant of the deformation process is characterized by t
he instantaneous rate of energy storage, de(s)/de(w), where e(s) is th
e stored energy and e(w) is the mechanical energy expended on the plas
tic deformation. It has been shown experimentally that, in the initial
stage of plastic deformation in this austenitic steel, the dependence
of the rate de(s)/de(w) on e(w) exhibits a maximum. The location of t
he maximum depends on the grain size of the material. In fine-grained
samples, the maximum appears at smaller strains. After reaching a cert
ain degree of deformation, plots of de(s)/de(w) vs. the strain for the
samples of both groups are practically the same. These results are in
terpreted in terms of the microstructural evolution during deformation
. It has been shown that the grain boundaries favour the formation and
affect the evolution of low energy dislocation structures.