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THE FRACTURE MECHANISM IN 475°C EMBRITTLED FERRITIC STAINLESS STEELS
Author(s) -
Marrow T. J.
Publication year - 1996
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1996.tb01027.x
Subject(s) - materials science , embrittlement , metallurgy , crystal twinning , slip (aerodynamics) , brittleness , grain boundary , transgranular fracture , lüders band , ultimate tensile strength , brittle fracture , fracture (geology) , intergranular fracture , composite material , microstructure , physics , thermodynamics
— The mechanism of “475°C embrittlement” in age‐hardened ferritic stainless steel, E‐Brite and A129‐4, is investigated. Experimental results for smooth tensile and notched bending fracture tests are interpreted using a finite element simulation of the stresses at fracture. Yield is characterised by profuse slip band formation. Transgranular fracture initiation is observed at slip band intersections with grain boundaries. Deformation twinning occurs during brittle fracture. Slip bands and deformation twins are identified using lattice rotations measured with electron back‐scatter diffraction patterns. Mechanisms for the ductile‐to‐brittle transition are discussed.