Serration of Fe-Ni austenitic steels at very low temperatures and its computer simulation.

概要

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Computer simulation of serration, that is, serrated plastic flow observed generally in almost all metallic materials at very low temperatures has been investigated by comparing with the actual deformation behavior of Fe-Ni binary austenitic steels in some coolants such as liquid helium. The simulation was carried out by dividing the specimen into small elements and calculating repeatedly basic equations for thermally activated movement of dislocations and for thermal balance to obtain the amount of strain and the temperature change of each element during a small time increment. The thermal balance was considered among the heats converted from the mechanical work, conducted a specimen and exchanged with the coolant. Although details of the dislocations movement has remained unclarified at cryogenic temperatures, it was concluded that the characteristics of the serration and the accompanied phenomena could be simulated very well without unreasonable assumptions. The effects of some factors on the serration were discussed by using the simulation.
The Iron and Steel Institute of Japanの論文