Stress-corrosion Of Cold Drawn
Prestressing Steels
Author(s)
J. Toribio
Abstract
This paper evaluates the anisotropic stress-corrosion behaviour of high-strength
cold-drawn prestressing steel wires. To this end, two eutectoid steels in the form
of a hot rolled bar and cold drawn wire were tested. While a tensile crack in the
hot rolled bar always propagates in mode I, in the cold drawn wire an initially
mode I crack deviates significantly from its normal mode I growth plane and
approaches the wire axis or cold drawing direction, thus producing a mixed
mode propagation. In hydrogen-assisted cracking the deviation happens just after
the fatigue pre-crack, whereas in localized anodic dissolution the material is able
to undergo mode I cracking before the deflection takes place. An explanation of
such behaviour can be found in the pearlitic microstructure of the steels. This
microstructural arrangement is randomly oriented in the case of the hot rolled bar
and markedly oriented in the wire axis direction in the case of the cold drawn
wire. Thus both materials behave as composites at the microstructural level and
their plated structure (oriented or not) would explain the different behaviour in a
corrosive environment.
Keywords: stress-corrosion cracking, pearlitic steel, steelmaking,
manufacturing, cold drawing, anisotropic fracture behaviour, fracture
micromechanisms.
1 Introduction
Stress corrosion cracking (SCC) of high-strength prestressing steel is a problem
of major technological concern since it can increase the risk of failure of
concrete structures. This paper analyses a wide set of SCC laboratory
experiments of pearlitic steel wires before and after cold drawing, i.e., the
previous (base) hot rolled material and the fully drawn prestressing steel wire
(final commercial product used in prestressed concrete, a material of the highest
Keywords
stress-corrosion cracking, pearlitic steel, steelmaking,
manufacturing, cold drawing, anisotropic fracture behaviour, fracture
micromechanisms.
Related Book
Other papers in this volume
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