Abstract
The fracture toughness behavior of the cast steel G42CrMo4 (1.7231) with intentionally added non‐metallic inclusions was evaluated at temperatures of –40 and 20 °C under quasi‐static loading. To this end, crack growth resistance curves were determined. Furthermore, the fracture surface was analyzed with respect to the stretch zone formation and the local inclusion distribution. The casts exhibited an inhomogenous inclusion size and distance distribution. This was attributed to clustering and accumulation of the non‐metallic inclusions. It was shown that models describing the crack initiation toughness Ji can be applied if the inclusion distribution is analyzed on a local scale.
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