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Journal ArticleDOI

Deformation of pearlite

George Langford
- 01 Jun 1977 - 
- Vol. 8, Iss: 6, pp 861-875
TLDR
In this paper, Bolling's method of transformation in a steep temperature gradient was used for drawing wire and strip in dies designed to minimize macroscopically nonuniform deformation, and cross sections of the drawn wires and strip were examined by conventional and high-voltage transmission electron microscopy.
Abstract
Pearlite with its lamellae oriented mainly parallel to the longitudinal direction was prepared by Bolling's method of transformation in a steep temperature gradient. The Fe-0.7 pct Mn-0.9 pct C pearlite was drawn into wire and also into strip in dies designed to minimize macroscopically nonuniform deformation. Cross sections of the drawn wires and strip were examined by conventional and high-voltage transmission electron microscopy and were analyzed by quantitative metallography for a) average interlamellar spacing, b) distribution of interlamellar spacings, and c) orientation relationship between the cementite lamellae and the slip systems in the ferrite. The strength of pearlite is proportional to the reciprocal square root of the average interlamellar spacing, and the proportionality constant analogous to the Hall-Petch constant (k) is related to the strength of the cementite lamellae. If the stress for the propagation of slip through the cementite is assumed constant, a Hall-Petch type of equation can be derived for the strengthening of the pearlite against slip in the ferrite by piled-up groups of dislocations. Evidence for the plastic deformability of cementite is presented; sufficiently thin cementite plates were fully plastic. The exponential strain hardening of drawn pearlitic wires and of rolled pearlite is explained in terms of locally inhomogenous deformation revealed by the lack of fragmentation of the lamellae.

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Citations
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Journal ArticleDOI

Defects in Carbon-Rich Ferrite of Cold-Drawn Pearlitic Steel Wires

TL;DR: By means of X-ray line profile analysis and positron lifetime spectroscopy, densities of deformation-induced defects in carbon-rich ferrite of a series of cold-drawn pearlitic steel wires with true strains (e) up to 5 are characterized.
Journal ArticleDOI

Dry rolling/sliding wear of nanostructured pearlite

TL;DR: In this article, the dry rolling-sliding wear behavior of pearlite with an interlamellar spacing of just 85 nm has been characterised and the wear resistance is comparable to that of much harder bainitic steels.
Journal ArticleDOI

Derivation of anisotropic flow curves of ferrite–pearlite pipeline steel via a two-level homogenisation scheme

TL;DR: In this paper, a multi-scale approach based on the homogenization method is presented to calculate the effective macroscopic stress-strain curves of a pearlitic-ferritic pipeline steel.
Journal ArticleDOI

Length-scale dependent mechanical properties of Al-Cu eutectic alloy: Molecular dynamics based model and its experimental verification

TL;DR: In this paper, the effect of lamellar length scale on the mechanical properties of two-phase metal-intermetallic eutectic structure was investigated using a molecular dynamics model and an atomic level energy partitioning of the lamellae and the interface regions.
References
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Book

The mathematical theory of plasticity

Rodney Hill
TL;DR: In this paper, the solution of two-dimensional non-steady motion problems in two dimensions is studied. But the solution is not a solution to the problem in three dimensions.
Book

Structure of Metals

TL;DR: The first serious application of the microscope to the study of metallic structure was made in 1864 by Dr. H. Sorby, of Sheffield, but the lead then given was not followed for nearly a quarter of a century as mentioned in this paper.
Journal ArticleDOI

The structure and properties of drawn pearlite

TL;DR: In this article, an empirical model has been developed to relate the flow stress of the drawn wire to the spacing of substructural barriers in terms of the drafting strain, which indicates that this type of strengthening mechanism is operative in the case of drawn iron wire of commercial purity.
Journal ArticleDOI

The role of dislocations in the flow stress grain size relationships

TL;DR: In this article, the authors reviewed the effects of pile ups of dislocations on the relation between yield or flow stress and grain size, and some non-pileup theories of yielding are critically reviewed.
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