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Hardening (metallurgy)

About: Hardening (metallurgy) is a research topic. Over the lifetime, 25584 publications have been published within this topic receiving 376012 citations.


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Journal ArticleDOI
TL;DR: Estrin et al. as mentioned in this paper proposed a cellular dislocation-based model for all hardening stages in large strain deformation and implemented it into the viscoplastic self-consistent polycrystal model to predict hardening curves corresponding to different proportional loading paths.
Abstract: A recent strain hardening model for late deformation stages (Estrin, Y., Toth, L.S., Molinari, A., and Brechet, Y., Acta Materialia, 1998, A dislocation-based model for all hardening stages in large strain deformation, Vol. 46, pp. 5509-5522) was generalized for the 3D case and for arbitrary strain paths. The model is based on a cellular dislocation arrangement in which a single- phase material is considered as a composite of a hard skeleton of cell walls and soft cell interiors. An important point in the approach is the evolution of the volume fraction of the cell walls which decreases with the deformation and gives rise to a plateau-like behavior (Stage IV) followed by a drop-off (Stage V) of the strain hardening rate observed at large strains. The hardening model was implemented into the viscoplastic self-consistent polycrystal model to predict hardening curves corresponding to different proportional loading paths. The calculated curves were evaluated to elucidate the path dependence of hardening.

180 citations

Journal ArticleDOI
TL;DR: In this article, a micromechanically-based composite model is proposed to study large plastic deformation and texture evolution in semi-crystalline polymers, which consists of co-existing crystalline and amorphous phases locally associated with each other in a fine plate-like morphological structure.
Abstract: A micromechanically-based composite model is proposed to study large plastic deformation and texture evolution in semi-crystalline polymers. The microstructure of many semi-crystalline polymers consists of co-existing crystalline and amorphous phases locally associated with each other in a fine plate-like morphological structure. An aggregate of two-phase composite inclusions is used to model these materials. Special consideration is given to molecular chain inextensibility within the crystalline phase. The introduction of a back stress tensor in the constitutive model of the amorphous phase accounts for hardening due to deformation-induced molecular alignment. Interface compatibility and traction equilibrium are enforced within each composite inclusion. A Sachs-like model and two newly-developed self-consistent-like hybrid models are proposed to relate volume-average deformation and stress within the two-phase composite inclusion to the remote (macroscopic) fields. Applications of these composite models arc made to predict stress strain behavior and texture evolution in initially isolropic high density polyethylene (HOPE) under different modes of straining.

180 citations

Journal ArticleDOI
TL;DR: In this paper, a magnesium alloy AZ91 plate was mechanically tested in five different test orientations in the solution-treated, underaged, peak-aged and overaged conditions and the critical resolved shear stresses for activation of basal slip, prismatic slip and twinning were then estimated for each of the ageing conditions.

179 citations

Journal ArticleDOI
TL;DR: In this article, a new oxygen boost diffusion technique has been developed for deep case hardening of titanium and its alloys, which essentially consists of thermal oxidation in air followed by diffusion in vacuum.
Abstract: In order to withstand the high stresses encountered in such general engineering components as bearings and gears, deep case hardening is necessary. In the present investigation, oxygen boost diffusion of titanium alloys has been explored and a new oxygen boost diffusion technique has been developed for deep case hardening of titanium and its alloys. The oxygen boost diffusion process essentially consists of thermal oxidation in air followed by diffusion in vacuum. A total hardened case of about 300 μm can be successfully achieved following the oxygen boost diffusion treatment. It has also showed that the oxygen boost diffusion treated titanium alloys exhibited significantly improved abrasive wear resistance. Based on the experimental results, the boost diffusion and hardening mechanisms are discussed.

179 citations

Journal ArticleDOI
TL;DR: In this paper, the authors report on the evolution of microstructure and mechanical properties of Fe/W multilayers subjected to helium ion irradiations and show that the magnitude of hardness variation after radiation depends on the individual layer thickness.

179 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202250
2021989
20201,144
20191,076
20181,038
2017981