Abstract
In a previous paper, it has been pointed out experimentally that the role of interaction between dislocations and “I.S.” atmosphere is very important for the high temperature strength of low alloy steels. The “I.S.” atmosphere named by the authors is the atmosphere of the complex of interstitial atoms (I) and substitutional atoms (S) combined chemically to each other. In this paper, the dragging force due to various solute atmospheres is calculated with Cottrell’s equations. It is concluded that the dragging force due to “I.S.” atmosphere in the iron-2% chromium alloy is about 4 kg/mm2 at a creep rate of 0.01%/hr at 800°K.
