Abstract
Die punches which fractured during extrusion of steel billets were investigated to assess the possible causes for premature failure. Visual examination and hardness measurements were carried out to support the evidence for failure. Detailed metallurgical investigation (optical and electron microscopy) of fractured die punches demonstrated the presence of cleavage and/or quasi cleavage fracture features typical of a brittle mode of fracture. It was observed that there was a need to evaluate the fracture toughness property of the material and the judgement based solely on hardness values seemed inadequate.
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