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PRIZE FOR BEST PAPER VOLUME 27
Publication year - 2005
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.1460-2695.2005.00911.x
Subject(s) - materials science , ferrite (magnet) , crack closure , metallurgy , fracture mechanics , duplex (building) , austenite , composite material , paris' law , microstructure , dna , biology , genetics
has been awarded to Fatigue crack propagation in cast duplex stainless steels: thermal aging and microstructural effects V. Calonne, A. F. Gourges and A. Pineau Fatigue Fract. Engng. Mater. Struct.,27 (1), pp . 31‐44 Abstract The ferrite phase of cast duplex stainless steels becomes embrittled after thermal ageing, leading to a significant decrease in fracture properties. In the present paper, the influence of ageing and solidification structure on the fatigue crack growth rates (FCGRs) and on the fatigue crack growth mechanisms in a cast duplex stainless steel is studied. FCGRs measured at room temperature increase slightly after ageing at 400 °C, due to ferrite cleavage and to the resulting irregular shape of the crack front. The crack propagates without any preferential path by successive ruptures of ferrite and austenite phases. The macroscopic crack propagation plane depends on the crystallographic orientation of the ferrite grain. Secondary cracks can appear due to the complex solidification structure. This in turn influences the FCGR. The fatigue crack closure level decreases with increasing ageing. This can be explained by a decrease in the kinematic cyclic hardening of these materials.