1. Quenching of Fe−Cr alloys leads to a change in Young's modulus and a Snoek peak and deformation peak on the TDIF curve, which are due to the solution of carbides and an increase in dislocation density. 2. For the alloy with 11 at. % Cr there is no connection between the change in the height of the deformation peak and the chromium content of the alloy, which may be due to the incomplete martensitic transformation resulting from the low Mf of this alloy. 3. Heating the quenched alloys to 500° leads to a reduction of ΔE, and the peaks practically disappear. However, for the alloy with 11 at. % Cr the value of ΔE increases and a Snoek peak appears, which is not observed in the annealed or quenched condition. This is evidently due to the low formation rate of special carbides and also to the size factor in the effect of chromium on Young's modulus of iron.