THE FRACTURE MECHANISM OF 475°C EMBRITTLEMENT IN A DUPLEX STAINLESS STEEL |
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| Authors: | T J Marrow C Harris |
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| Affiliation: | Manchester Materials Science Centre, UMIST and University of Manchester, Grosvenor Street, Manchester M1 7HS |
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| Abstract: | 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. |
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| Keywords: | Duplex stainless steel Embrittlement at 475°C Brittle fracture initiation Deformation twins Ductile/brittle transition Age-hardening |
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