Strain rate and temperature effects on the shear stength of 304N stainless stell (SUS304N).

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Abstract
The influences of strain rate and temperature on the flow stress of 304N stainless steel (SUS 304N) were studied experimentally. The thin walled tubular specimens with short gage length were tested at various strain rates between 10-3-103sec-1 in torsion. The experiments were performed in the temperature range from 83K to 296K. In the region of strain less than 20%, where the amount of martensite was relatively little, the flow stress under isothermal conditions was evaluated from the tested data obtained under the adiabatic test conditions. The strain and temperature effects on the shear strength of 304N stainless steel were investigated on basis of the flow stress under isothermal conditions. In the region of strain less than 5%, the amount of martensite formed in the specimen during torsional deformation was little and the effect of the amount on the shear strength could be disregarded, regardless of strain rate and temperature. At high strain rates, the strain rate effect on the flow stress in the region of strain less than 20% became remarkable with an increase in strain. In the region of strain less than 5%, where the material is in nearly complete austenitic phase, the followings became clear. At the constant strain rate, the flow stress in shear increased almost linearly with decreasing temperature. The slope of the shear stress-temperature curve at a high strain rate became gentler than that at a low strain rate. As the temperature became lower, both of the flow stress-temperature curves at the high strain rate and at the low strain rate showed a tendency to get close to each other. But the both curves did not coincide with each other at 0K. The strain rate dependency of the extrapolated threshold stress τ of 304N stainless steel was pronounced.

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