The aim of the present study is the prediction of critical conditions (including critical strain and flow stress) for the initiation of dynamic recrystallization during thermo-mechanical processing of plain carbon steels. For this propose, torsion tests were conducted at different temperature (1050, 1100 and 1150˚C) and strain rates (0.002, 0.02 and 0.2/s). All flow curves showed a peak st...

Hot deformation and softening response for the titanium aluminide Ti–48Al–2V–0.2B has been investigated. The to mechanisms examined. Deformation experiments were carried out in strain rate range 0.01–10 s?1 keeping temperature constant at 1200 °C 1000–1200 1 s?1. With an increase rate, microstructural changes associated with mechanism include breaking of lamellae, spheroidization broken laths d...

the full annealing aa6061 aluminum alloy was subjected to severe plastic deformationvia the combination of equal channel angular pressing (ecap) and cold rolling (cr) in order torefine its microstructure and to improve its mechanical properties. according to the results of hotand cold tensile tests, the combination of ecap and cr significantly affected the final strengthand ductility of studied...

In the hot compression test friction has a detrimental influence on the flow stress through the process and therefore, correcting the deformation curve for real behavior is very important for both researchers and engineers. In this study, a series of compression tests were simulated using Abaqus software. In this study, it has been employed the Taguchi method to design experiments by the factor...

2014 We discuss measurements by mean of small angle neutron scattering of the form factor of a long chain (M > 2 x 106) in two comparably deformed materials : (i) A melt, stretched 4.6 times (leading, in a perpendicular direction, to a deformation 1/~4.6 ~ 0.46). The long chain, deuterated, is dissolved in the matrix non-deuterated chains. (ii) A gel, crosslinked in solution, deformed by d...

If there is given an isotopic deformation of a two-dimensional euclidean plane E onto itself, one can adjoin to every point P of E a certain closed curve, the so-called "indicatrix" of P (§1). If the indicatrix does not pass through P, we introduce the order of P relative to its indicatrix as the "rotation number" of the deformation at P. A relation between the rotation numbers in different poi...

The problem of determining the effective incremental response of nonlinearly elastic composite materials given some initial prestress is of interest in numerous application areas. In particular, the case when small-amplitude elastic waves pass through a prestressed inhomogeneous structure is of great importance. Of specific interest is how the initial finite deformation affects the microstructu...