The Fracture Mechanism of 475°c Embrittlement in a Duplex Stainless Steel

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The mechanism of “475°C embrittlement” of a duplex stainless steel was investigated using finite element modelling of the stress distribution at brittle fracture initiation. Brittle fracture initiated at a critical shear stress, which increased with ferrite hardness. The fracture stress was affected by the duplex microstructure. Fracture was nucleated by deformation twins, which were identified using electron back‐scatter diffraction. The ductile‐to‐brittle fracture transition was sensitive to age‐hardening and could be described simply by the effect of age‐hardening and test temperature on the yield stress.