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THE INFLUENCE OF AGEING AT INTERMEDIATE TEMPERATURES ON THE MECHANICAL BEHAVIOUR OF A DUPLEX STAINLESS STEEL: Part II. FATIGUE LIFE AND FATIGUE CRACK GROWTH
Author(s) -
Iturgoyen L.,
Anglada M.
Publication year - 1997
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.1460-2695.1997.tb01535.x
Subject(s) - materials science , ageing , crack closure , paris' law , stress intensity factor , stress concentration , fracture mechanics , metallurgy , composite material , genetics , biology
— The mechanical behaviour of AISI 329 steel has been investigated for ageing times up to 20,000 h at temperatures of 475, 425, 375, 325 and 275°C. The study has concentrated on the changes in the response to cyclic strains, in the low‐and the high‐cycle fatigue regimes, and in the resistance to fatigue crack propagation as a function of temperature and time of ageing. It is shown that ageing increases the fatigue resistance in the high‐cycle fatigue regime, but the opposite occurs in the low‐cycle fatigue regime. Ageing increases the LEFM threshold stress intensity factor range for fatigue crack propagation which reaches high values in these alloys, and is influenced by the fatigue load ratio. Crack closure contributes to the LEFM threshold stress intensity factor range for crack propagation only in the annealed condition of the AISI 329 steel.