不規則障害物説に基づく炭素鋼における降伏点現象の記述

抄録

An approach to describe the yield-point phenomenon of carbon steel at a low strain rate was presented by considering the behavior of the moving dislocations in the resisting force field of the random barriers theory. By reflecting the catastrophic increase of movable dislocations freed from any locking atmospheres in the internal structure variable on the theory, the equations to express the stress decrement at the upper yield point and the yield-point elongation were derived. Through the examination of the test results for several annealed carbon steels, it was clarified that the upper and lower yield point as well as the yield-point elongation of these metals could be described systematically with the area fraction of pearlite in a ferrite matrix.