CORRELATION OF THE MICROSTRUCTURE AND THE TENSILE DEFORMATION OF INCOLOY MA956

The microstructures of INCOLOY MA956 in the as-received condition and after hot tensile testing have been investigated by optical and transm ission electron microscopy. The results of the structural analyses wer e correlated with the tensile properties in the temperature range 20-9 50 degrees C. Significant changes in the deformation behaviour and the dislocation structures were observed as the test temperature was incr eased. Up to 400 degrees C, strain hardening was observed and dislocat ion densities were correspondingly low. An attractive dislocation-part icle interaction was seen, dislocations remaining in contact with the oxide dispersoid particles on the departure side of the particles.