Effect of the cooling medium on low-temperature deformation of chromium-nickel steels

A study was made concerning the plastic deformation of grades 03Khl8N8, 03Khl8N20, and 0Khl8N10T steel during elongation at a strain rate ϵ˙=1⋅10−3−5.5⋅10−4sec−1 in liquid hydrogen (14.5–20.4°K), as well as in gaseous hydrogen (21–25°K) and helium (16–30°K). On the basis of stress-strain curves obtained here, the effect of experimental conditions on the trends in the development of jumpwise plastic deformation is then established. It has thus been found that jumpwise plastic deformation increases when cooling with liquid hydrogen is replaced by cooling with a gaseous medium, when the temperature of liquid hydrogen is lowered, or when the deformation rate is increased. These effects are analyzed, with heat dissipation at the interface between deformed material and cooling medium taken into account. Conclusions are drawn concerning the significant role of thermal processes in the intensification of jumpwise low-temperature plastic deformation of metals.

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