Characterization of the cold ductility degradation after aging in centrifugally cast 20Cr32Ni+Nb alloy tube

The mechanical properties (yield stress, ultimate tensile stress and elongation) of alloy 20Cr32Ni + Nb subject to isochronal aging at temperatures between 670 and 820 °C for 200 h were investigated using samples extracted from a centrifugally cast tube. The results confirm the occurrence of embrittlement in the aged samples, with maximum embrittlement observed around 770 °C without significant gain in strength.