On the delamination of FeCrAl ODS alloys

Tensile specimens have been tested at room temperature, finding clear delamination in the rolling direction but only incipient delamination in the transverse direction. Delamination is found to be a strain rate-controlled process whose morphology depends on the material’s processing history, suggesting that its cause may be embrittlement induced by hydrogen occluded during processing. Delamination has only a small influence on mechanical properties in the rolling direction, but in the transverse direction a loss of ductility is detected particularly for aged specimens.
The authors acknowledge financial support from the Spanish Ministerio de Educación y Ciencia in the form of a Coordinated Project in the Energy Area of Plan Nacional 2006 (ENE2006-15170- C02). Moreover, one of the authors (J. Ch) gratefully acknowledges the contribution of Ms. C. Pe˜na for her help with the fractographic work.