Journal ArticleDOI
Specific dislocation multiplication mechanisms and mechanical properties in nanoscaled multilayers: The example of pearlite
TLDR
In this paper, the authors derived the constitutive law of the material from a balance between dislocation multiplication and annihilation rates, and predicted a linear dependence of the flow stress with the reciprocal interlamellar spacing, and a stress saturation for very small spacings.Abstract:
Dislocation mechanisms responsible for mechanical properties of nanoscaled multilayers are studied using the example of heavily drawn pearlitic steel wires. Two specific types of dislocation source are observed during transmission electron microscopy in situ straining experiments: one dislocation source operates at wide interlamellar spacings by dislocation propagation in ferrite around cementite islands; the other consists of dislocations bulging in ferrite from interfaces, and is more likely to operate at narrow interlamellar spacings. The constitutive law of the material is derived from a balance between dislocation multiplication and annihilation rates, and predicts a linear dependence of the flow stress with the reciprocal interlamellar spacing, and a stress saturation for very small spacings.read more
Citations
More filters
Journal ArticleDOI
Atomic-scale mechanisms of deformation-induced cementite decomposition in pearlite
Yujiao Li,Pyuck-Pa Choi,Christine Borchers,S. Westerkamp,Shoji Goto,Dierk Raabe,Reiner Kirchheim +6 more
TL;DR: In this article, a local electrode atom probe was used to characterize the microstructural evolution of pearlitic steel, cold-drawn with progressive strains up to 5.4 GPa.
Journal ArticleDOI
Metallic composites processed via extreme deformation: Toward the limits of strength in bulk materials
Dierk Raabe,Pyuck-Pa Choi,Yujiao Li,Aleksander Kostka,Xavier Sauvage,Florence Lecouturier,Kazuhiro Hono,Reiner Kirchheim,Reinhard Pippan,David Embury +9 more
TL;DR: In this paper, the authors review microstructures and properties of metal matrix composites produced by severe plastic deformation of multiphase alloys, and they relate to the nature of the complex dislocation, amorphization, and mechanical alloying mechanisms upon straining and their relationship to the enormous strength.
Journal ArticleDOI
Analysis of the hysteresis loops of a martensitic steel: Part I: Study of the influence of strain amplitude and temperature under pure fatigue loadings using an enhanced stress partitioning method
TL;DR: In this article, a study of the cyclic stress partitioning is presented, where the authors identify the microstructural mechanisms leading to the softening effect usually presented by martensitic steels under cyclic loadings.
Journal ArticleDOI
Deformation and Diffusion Modes in Nanocrystalline Materials
TL;DR: An overview of theoretical models of plastic deformation and diffusion processes in nanocrystalline (nano-grained) materials is presented in this paper, with emphasis on competition and interaction between these deformation mechanisms and explanation of the key experimentally detected facts.
Journal ArticleDOI
Microstructure based modeling for the mechanical behavior of ferrite–pearlite steels suitable to capture isotropic and kinematic hardening
Sébastien Allain,Olivier Bouaziz +1 more
TL;DR: In this paper, a microstructure based model for the mechanical behavior of non-microalloyed ferrite-pearlite steels is proposed, where the internal stresses evolving with strain are estimated.
References
More filters
Journal ArticleDOI
The structure and properties of drawn pearlite
J.D. Embury,R.M Fisher +1 more
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
Cementite dissolution in heavily cold drawn pearlitic steel wires
TL;DR: In this paper, the influence of cold wire drawing on the structure of a pearlitic steel containing 0.7 wt% of carbon and subjected to a strain of approximately 3.5 has been studied.
Journal ArticleDOI
On dislocation storage and the mechanical response of fine scale microstructures
J.D. Embury,John P. Hirth +1 more
TL;DR: In this paper, a small size scale is attained where flow in a ductile layer occurs by the motion of single dislocations rather than dislocation arrays, and the flow stress should follow an Orowan-type relation accompanied by rapid effective work hardening.
Journal ArticleDOI
Strength enhancement in thin‐layered Al‐Cu laminates
TL;DR: In this article, a multilayered Al-Cu laminates were prepared by vapor deposition in vacuum onto NaCl substrates and the 25°C stress-strain characteristics were measured for Laminates having total thicknesses of 1.0 and 2.0 μm and layer thickness ranges from 20 to 1000 nm.
Journal ArticleDOI
Influence of deformation substructure on flow and fracture of fully pearlitic steel
TL;DR: In this paper, the impact of interlamellar spacing on the yield strength, flow stress, and true U.S.T. is quantitatively explained by coupling mechanical data with TEM examination.
Related Papers (5)
On dislocation storage and the mechanical response of fine scale microstructures
J.D. Embury,John P. Hirth +1 more