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CORROSION FATIGUE OF MILD STEELS IN A SODIUM NITRATE SOLUTION
Author(s) -
GREENWELL B. S.,
PARKINS R. N.
Publication year - 1982
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.1460-2695.1982.tb01229.x
Subject(s) - intergranular corrosion , materials science , cracking , stress corrosion cracking , metallurgy , tension (geology) , corrosion , transgranular fracture , stress (linguistics) , composite material , intergranular fracture , ultimate tensile strength , linguistics , philosophy
— Cyclic loading of mild steels in 4 N NaNO 3 produces intergranular cracking similar to that associated with stress corrosion cracking at static loads, even when the cyclic loads are below the threshold for cracking under static conditions. However, under some circumstances cyclic loading promotes transgranular crack growth, the velocity of which may increase or decrease with increasing stress intensity factor. The transition from intergranular to transgranular cracking, or vice versa, is determined by the relative velocities of the two modes of failure, that observed having the higher velocity. The suppression of transgranular cracking as the stress intensity factor increases is only observed when the loading involves a compressive component and the effect is explained in terms of corrosion products interfering with the cracking process. Tension‐tension loading in nitrates produces crack growth characteristics similar to those observed in oil.