Mechanical Properties of Fe-Cr Alloys Embrittled at 475℃

The mechanical properties of 0～53%Cr-Fe alloys have been studied after aging at 475℃, and the following results have been obtained. (1) A ductile-brittle transition phenomenon is observed under static bending test. In 25～30% Cr alloys, the transition temperature rises with the progress of aging, and passes through room temperature after 20～50 hr aging, finally reaching about 300℃ with further aging. (2) There is a marked difference in the compression work-hardening characteristics between the ductile and the brittle states. In the latter state, the work-hardening exponent within a low strain range is very high and the yield stress is hardly varied by prolonged aging. (3) The work-hardening characteristics are similar to those of body-centered cubic metals at low temperatures