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Anisotropic stress corrosion cracking behaviour of prestressing steel
Author(s) -
Toribio J.,
Lancha A. M.
Publication year - 1998
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/(sici)1521-4176(199801)49:1<34::aid-maco34>3.0.co;2-a
Subject(s) - stress corrosion cracking , stress intensity factor , cracking , materials science , metallurgy , corrosion , composite material , stress (linguistics) , bar (unit) , fracture mechanics , physics , linguistics , philosophy , meteorology
This paper evaluates the anisotropic stress corrosion cracking behaviour of high‐strength prestressing steel wires. To this end, two eutectoid steels in the form of hot rolled bar and cold drawn wire were subjected to stress corrosion cracking tests in aqueous environments using a constant strain technique and precracked three point bend specimens to measure the crack growth rate da/dt as a function of the stress intensity factor K I under hydrogen embrittlement environmental conditions (pH = 12.5 E = − 1200 mV SCE). While the hot rolled bar presents an isotropic stress corrosion cracking behaviour associated with mode I crack growth, the cold drawn wire exhibits a change in crack propagation direction approaching that of the wire axis (cold drawing direction) and producing mixed mode crack growth. This anisotropic stress corrosion cracking behaviour is a consequence of manufacturing, since cold drawing affects the microstructure of the material and produces a preferential orientation of the pearlite lamellae aligned parallel to the wire axis. The differences of crack growth rate as a function of the crack propagation direction are discussed.