A Study of Fracture Mechanisms in RAFM Steel in the Ductile to Brittle Transition Temperature Regime
作者： A. Moitra , Arup Dasgupta , S. Sathyanarayanan , G. Sasikala , S.K. Albert
DOI: 10.1016/J.PROENG.2014.11.036
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摘要: Abstract The fracture behaviour of a Reduced Activation Ferritic Martensitic Steel (RAFM) has been studied within the Ductile to Brittle Transition Temperature (DBTT) regime. DBTT determined by ASTM E 1921 based reference temperature approach under dynamic loading condition. (T0dy) was found be − 33.8 °C. mechanism extracting TEM specimens precisely at crack initiation sites using focused ion beam (FIB) technique in high resolution dual scanning electron microscope. Detailed analytical studies revealed that morphology carbides play crucial role crack. larger ellipsoidal carbides, which were Cr-rich, have responsible for dislocation piles ups. shorter edge these are areas stress concentration and initiate cracks decohesion particle-matrix interface. On contrary, iron rich smaller, more spherical, thus less effective blocking movement therefore formation pile results, reveal an important towards ferritic-martensitic steels, will presented detail.
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