Abstract
Microstructural aspects of the creep plasticity and impact strength of non-stabilized austenitic CrNiMo steels with two different nitrogen contents have been evaluated. During creep exposure an intergranular precipitation of the sigma phase, M23C6 or/and Cr2N particles produce favourable conditions for transition from typically intergranular fracture to ductile shear fractures or to intergranular ductile fractures with characteristic dimple morphology. A given type of fractures is accompanied with high values of the relative creep rupture elongation (up to 100%) dependent on temperature and time to rupture.
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