Abstract
An investigation was undertaken to establish a relationship between fracture mode and toughness ( K Ic ) vs temperature for UNS-S15500 (15-5 PH) in the H583dgC (H1080°F) condition. It was found that the mechanical properties such as yield strength were temperature insensitive in the range -20–22°C. Tensile rupture was by microvoid initiation and coalescence. In contrast, fracture toughness values showed a slight decrease with a temperature decrease. Over the temperature range investigated fracture was a mixed mode containing quasi-cleavage and microvoid coalescence. No single microstructural characteristic distance or model was found to correlate with the fracture toughness decrease.
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