Environmentally assisted stress-corrosion cracking of high-strength carbon steel patented wire

Sarafianos, N.

doi:10.1007/bf00720232

Cited by 28 publications

(5 citation statements)

References 5 publications

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“…For example, the HE resistance of drawn pearlitic steel was mainly studied by macroscopic mechanical tests, such as a slow-strain rate test and a constant load test. 1,2,[7][8][9][10][11] Machining of macroscopic specimens with the tensile axis normal to the drawing direction is difficult because of a limited diameter of the drawn wire. As a result, the HE resistance in the radial direction of the drawn wire is hardly understood although that in the drawing direction was extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy in Hydrogen Embrittlement Resistance of Drawn Pearlitic Steel Investigated by <i>in-situ</i> Microbending Test during Cathodic Hydrogen Charging

et al. 2018

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To investigate causes of superior hydrogen embrittlement resistance of drawn pearlitic steel, notched microcantilevers with different notch orientations with respect to the lamellar interface were fabricated by focused ion beam, and microbending tests were conducted in air and during cathodic hydrogen charging by electrochemical nanoindentation. In air, indentation load monotonically increased with increase in indentation displacement, and no crack appeared for any notch orientations. During hydrogen charging, indentation load declined, and a crack appeared. The load reduction with respect to the displacement was larger, and the crack was deeper for the notch parallel to the lamellar interface than that normal to the lamellar interface. Furthermore, stationary cracks in the microcantilevers were observed by scanning electron microscopy and scanning transmission electron microscopy. For the notch parallel to the lamellar interface, a sharp long crack was identified along the lamellar interface. The crack stopped at the position where the cementite lamellae are disconnected. In lattice images, cementite was identified in one side of the crack, and ferrite in another side of the same crack. On the other hand, for the notch normal to the lamellar interface, a blunt short crack was identified. Thus, it was concluded that the ferrite-cementite interface is a preferential crack path, and hydrogen embrittlement resistance in the direction parallel to the lamellar interface is superior to that normal to the lamellar interface. The present results also indicate that directional lamellar alignment of the drawn pearlitic steel suppresses crack propagation in the radial direction of the drawn wire, improving the hydrogen embrittlement resistance in the drawing direction.

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Section: Introductionmentioning

confidence: 99%

Anisotropy in Hydrogen Embrittlement Resistance of Drawn Pearlitic Steel Investigated by <i>in-situ</i> Microbending Test during Cathodic Hydrogen Charging

et al. 2018

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“…These steels are manufactured from a hot rolled bar which is heavily cold drawn in several passes to obtain the commercial prestressing steel wire with increased yield strength obtained by a strain-hardening mechanism. Thus, although it is clear that cold drawing improves the (traditional) mechanical properties of the steel (i.e., those properties useful for regular service), the strong plastic deformations in the wire axis (drawing direction) during manufacture may produce anisotropic fracture behaviour in air [2,3] and in aggressive environments [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of cold drawn eutectoid steel wires for prestressed concrete

Toribio

Valiente

2006

Engineering Failure Analysis

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“…The anisotropic fracture behaviour of cold drawn pearlitic steel in air has been elucidated in papers, 2,3) indicating that this material exhibits crack deflection and mixed mode propagation. In aggressive environments, i.e., in conditions which promote stress corrosion cracking, the behaviour of cold drawn steel is also anisotropic, [3][4][5][6] exhibiting environmentally-assisted crack deflection. Specific works on hydrogen assisted cracking of prestressing steel-a particular stress corrosion cracking mechanism very frequent and dangerous in structural engineering-can be found in the literature, [7][8][9] showing the high susceptibility of prestressing steel to hydrogen embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Fracture Behaviour in Progressively Drawn Pearlitic Steel.

Toribio

2002

ISIJ International

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In this paper the fracture behaviour of progressively drawn pearlitic steels is studied. To this end, samples from different stages of an industrial manufacturing process were analyzed to elucidate the consequences of steelmaking by cold drawing on the fracture toughness and the microscopic fracture modes. The real manufacture chain was stopped in the course of the process, and samples of five intermediate stages were extracted, apart from the original material or base product (hot rolled bar: not cold drawn at all) and the final commercial product (prestressing steel wire: heavily cold drawn). Results demonstrated that progressive cold drawing affects clearly the fracture performance of the materials, so that the most heavily drawn steels exhibit anisotropic fracture behaviour with crack deflection, i.e., a change in crack propagation direction which deviates from the original mode I propagation and approaches the wire axis or cold drawing direction, thereby producing a mixed mode stress state. At the microscopical level, clear changes are observed in the micrographs with appearances from cleavage-like in the slightly drawn steels to predominant micro-void coalescence in the heavily drawn steels. From the macroscopic fracture mechanics viewpoint, the manufacture process by cold drawing is beneficial, since the fracture toughness is progressively increased by steelmaking. These important results demonstrate that both the traditional mechanical properties (e.g. the yield strength) and the fracture mechanics properties (e.g. the fracture toughness) are improved by cold drawing.

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Environmentally assisted stress-corrosion cracking of high-strength carbon steel patented wire

Cited by 28 publications

References 5 publications

Anisotropy in Hydrogen Embrittlement Resistance of Drawn Pearlitic Steel Investigated by <i>in-situ</i> Microbending Test during Cathodic Hydrogen Charging

Anisotropy in Hydrogen Embrittlement Resistance of Drawn Pearlitic Steel Investigated by <i>in-situ</i> Microbending Test during Cathodic Hydrogen Charging

Failure analysis of cold drawn eutectoid steel wires for prestressed concrete

Evolution of Fracture Behaviour in Progressively Drawn Pearlitic Steel.

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