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FATIGUE CRACK GROWTH RATE BEHAVIOUR OF STAINLESS STEEL CLADDINGS IN AIR AND UNDER VACUUM AT 300°C
Author(s) -
Pedron J. P.,
Diboine A.,
Pineau A.
Publication year - 1984
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.1460-2695.1984.tb00411.x
Subject(s) - materials science , cladding (metalworking) , metallurgy , carbon steel , paris' law , welding , fracture mechanics , growth rate , composite material , crack closure , geometry , corrosion , mathematics
CT type specimens containing two layers of 309L and 308L cladding stainless steels welded to A508 carbon steel and 316 stainless steel were specially devised to test the influence of R ratio and environment on the crack propagation rate behaviour of cladding materials at 300°C. Large effects are shown. The crack growth rate under vacuum can be smaller by more than one order of magnitude as compared to air. Large differences are also shown on the fracture surfaces, where it is observed than vacuum promotes the formation of large crystallographic {111} facets. The effect of environment is briefly discussed on the basis of existing gas adsorption models.