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Title: Effects of pre-strain on strength, ductility and toughness of pipe steels – a review
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Catalog No.: 2371s
Date of Publication: 2016-03-01
Price: $25.00 US
Authors: Dr Su Xu, Dr William R Tyson, and Lin Yang
Abstract: EXPERIMENTAL AND MODELLING results reported in the literature on the effects of pre-strain on the strength, ductility, and toughness of steels, with particular emphasis on pipe steels, are summarized. Most of the results are from investigations related to effects of pipe longitudinal pre-strain on longitudinal tensile properties and toughness properties with the crack plane perpendicular to the pre-strain direction. The load-elongation curve of pre-strained steel follows that of the undeformed steel (after shifting the curve along the elongation axis by the amount of pre-strain). It follows that the yield and tensile strengths of specimens machined from pre-strained steel are increased, and the ductility (strain to fracture) is decreased. The ductile-to-brittle-transition temperature (DBTT) is generally increased by tensile pre-strain. However, there are inconsistent effects on notch toughness (Charpy absorbed energy, CVN) in the upper shelf of some modern pipe steels, complicated by the fact that Charpy specimens of high-strength pipe steels are often not completely broken. Since CVN reflects the energy absorbed in deformation at the crack tip, it is closely related to the energy absorbed in a tensile test from yield to fracture. Thus, the opposite effects of tensile pre-strain on strength and ductility produce competing effects on the absorbed energy, and inconsistent effects on the Charpy upper-shelf energy. Compressive pre-strain decreases yield strength (the Bauschinger effect); the fracture toughness for initiation is decreased but the notch toughness may be increased in some cases. Pre-strain generally has larger effects on the DBTT for fracture toughness initiation than on the notch toughness (CVN) DBTT. A brief discussion is included of significant progress that has been made in using models to study effects of pre-strain by shedding light on the micromechanisms controlling fracture.
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