Abstract
Structural changes in iron during creep at 600°C under constant stresses of 176 and 550 kg/cm 2 were investigated by means of several different techniques. These techniques include metallographic examination, high resolution X-ray methods and transmission electron microscopy. Quantitative measurements show that with increasing creep strain the subgrain size remains constant but the disorientation between subgrains increases and the lattice misorientation within the subgrains decreases. No pile-up groups of dislocations are observed. Gross grain deformation accounts for about 25–30 per cent of the overall strain. This finding indicates that grain-boundary shearing is a prominant deformation mode for iron under the conditions of temperature and strain rate investigated. Extensive void formation in grain boundaries is found and is attributed to the predominance of grain-boundary shearing.
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