Deformation and damage processes during creep of Incoloy MA957

Tensile creep and creep facture properties at 873–973 K are reported for the oxide-dispersion-strengthened (ODS) ferritic steel, Incoloy MA957. The results are interpreted on the basis of information derived from microstructural studies, yield stress data, creep curve shape analyses and comparisons of tensile and compressive creep characteristics. Using this combination of approaches, the observed behaviour patterns can be rationalized in a manner consistent with the processes shown to govern strain accumulation and damage development during creep of ODS alloys produced with high grain aspect ratios.