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Abstract
This paper presents a study of the causes of cleavage in swaged and drawn tungsten rod. The results show that cleavage fracture is nucleated by separation of grain boundaries that are transverse to the direction of swaging and drawing. It is further shown that heat treatments that cause either an increase in the density of transverse grain boundaries or a significant widening of the grains lead to a reduction of fracture stress because they increase the probability of nucleating a crack of critical size at a low stress. These results can all be interpreted in terms of the Griffith model for cleavage fracture.
MST/1383