Influence of ageing stress on yield point phenomenon in very low carbon steel
Authors: Duval, M.; Dickson, J. I.
Source: Metal Science, Volume 13, Number 9, September 1979 , pp. 523-529(7)
Publisher: Maney Publishing
Abstract:Plots of yield drop versus ageing stress vary from curves presenting a minimum at an intermediate stress close to the internal stress to curves presenting a maximum near this stress. The ageing kinetics can best be treated by assuming an equation of the form, ??/?f=A+Btn. The constant A can be directly measured at low temperature and represents the contribution of dislocation-dislocation interactions to the yield drop. The contribution from solute strainageing includes tendencies to increase the yield point with ageing stress, and, in combination with dislocation mobility or dislocation rearrangement effects, to cause the maximum close to the internal stress. The time exponent n is of the order of 2/3 for all ageing stresses. The activation energies are similar for ageing at the flow stress and at zero stress and agree with values previously reported for the two stages of ageing.
Document Type: Research Article
Publication date: 1979-09-01
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