Thermomechanical processing of iron, titanium, and zirconium alloys in the BCC structure
David L Bourell,H.J. McQueen +1 more
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TLDR
The body centered cubic (bcc) metals undergo a high level of dynamic recovery during elevated temperature straining so that the stress increases monotonically to a steady-state value σs as discussed by the authors.Abstract:
The body centered cubic (bcc) metals undergo a high level of dynamic recovery during elevated temperature straining so that the stress increases monotonically to a steady-state value σs. The strain rate and σs are related by means of the power, the exponential, or the sinh law with an Arrhenius temperature relationship. The activation energy for a iron has values of 250–280 kJ/mol, whereas for β titanium and β zirconium it is in the range 134–184 kJ/mol. The structure developed during hot working consists of elongated grains containing subgrains of dimension inversely proportional to σs. In warm working of α iron (limited to below 0.66T
m), the textures are similar to those for cold working. In working β titanium and β zirconium which is limited to above 0.6T
m except in β stabilized alloys or as matrix in α+ β processing, the bcc textures transform into α textures. The α iron relies principally on substructure strengthening in association with carbides. The β phases can be thermomechanically processed to provide equiaxed or lamellar a in a variety of dimensions and combinations, with or without substructure. Hot working of the bcc refractory metal alloys, principally molybdenum, is similar to hot working of α iron.read more
Citations
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Twinning, dynamic recovery and recrystallization in hot worked Mg–Al–Zn alloy
TL;DR: The AZ31 Mg alloy was hot torsion tested from 180 to 450°C and from 0.01 to 1.0 s −1. The flow curves showed a peak and a decline towards a steady-state regime which were lower as temperature T rose and strain rate declined as mentioned in this paper.
Journal ArticleDOI
Unique high-temperature deformation dominated by grain boundary sliding in heterogeneous necklace structure formed by dynamic recrystallization in HfNbTaTiZr BCC refractory high entropy alloy
TL;DR: In this article, microstructural evolution of dynamically recrystallized (DRX) grains and grain boundary sliding in the heterogeneous necklace structure of HfNbTaTiZr refractory high entropy alloy (RHEA) was studied systematically during high temperature deformation.
Journal ArticleDOI
Recrystallization during Thermomechanical Processing of IMI834
P. Vo,Mohammad Jahazi,S. Yue +2 more
TL;DR: In this article, the microstructure development of the near-α titanium alloy IMI834 displaying an initial bimodal α+β micro-structure has been characterized with respect to dynamic and static β recrystallization, through quantitative metallography.
Journal ArticleDOI
Substructural changes during hot deformation of an Fe-26Cr ferritic stainless steel
TL;DR: In this article, the authors studied the dynamic softening and substructural changes during hot deformation of a ferritic Fe-26Cr stainless steel and found that straight sub-boundaries and equiaxed subgrains developed progressively with strain, leading eventually to a stable substructure at strains greater than 0.7.
Journal ArticleDOI
Microstructure evolution and deformation features of AZ31 Mg-alloy during creep
TL;DR: In this paper, the deformation features of AZ31 Mg-alloy during high temperature creep are investigated by means of the measurement of the creep curve and the observation of SEM and transmission electron microscope (TEM).
References
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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.
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TL;DR: The paper as discussed by the authors presents the papers given at a conference on the mechanical properties of metals and alloys, including hardening, anisotropy and texture, phase transformations, creep resistance, plasticity, deformations, microstructure, fracture properties, fatigue, wear resistance, temperature effects, stress analysis, and recrystallization.