Structural and Analytical Evaluation of the Strain Intensity and its Components During Cross-Roll Piercing at Different Feed Angles

Metallurgist - Strain intensity and its components during cross-roll piercing at different feed angles were evaluated using a combined structural/analytical method. Commercially pure aluminum...     

Effect of Radial–Shear Rolling on the Formation of Structure and Mechanical Properties of Al–Ni and Al–Ca Aluminum–Matrix Composite Alloys of Eutectic Type

Results of an analysis of the mechanical properties and macro- and microstructures and the fractographic analysis of the fractures of samples of the Al–6 wt % Ni and Al–7.6 wt % Ca aluminum–matrix composite alloys of eutectic type after thermomechanical treatment, including radial–shear rolling (RSR),—have been presented. The hot deformation of preliminarily annealed ingots of studied alloys with a circular section 60 mm in diameter using RSR method at 400–450°C with total reduction μ = 9.0 can lead to the formation of the gradient microstructure with external more deformed layer characterized by high microhardness and thickness of about 1.5–2.5 mm. The microhardness decreases smoothly from the periphery to the center of samples. Uniaxial tensile tests revealed that the strength of alloys after RSR increases by 2.0–2.5 times compared to the as-cast or the annealed state, the plasticity is the same as in the annealed state or increases by several times as in the case of the Al–7.6 wt % Ca alloy. The latter fact is clearly illustrated by the results of the analysis of the fractures of samples, for which the transition from the brittle or mixed type of the fracture before deformation treatment to the pronounced ductile dimpled type after RSR has been observed.     

Improvement of the Precision of Pipes with the Use of Profiled Pipe Billets

Metallurgist - We propose a technology for the production and piercing profiled pipe billets with an aim to improve the precision of hollow billets and pipes. To obtain profiled billets, it is...     

Effect of Radial Shear Rolling on the Structure and Mechanical Properties of a New-Generation High-Strength Aluminum Alloy Based on the Al – Zn – Mg – Ni – Fe System

Metal Science and Heat Treatment - A high-strength aluminum alloy based on the Al – Zn – Mg – Ni – Fe system is studied in deformed condition after radial shear rolling with...     

Features of Piercing Mill TPA 50-200 Working Roll Wear During Rolling Continuously-Cast and Hot-Rolled Billets

Metallurgist - Results are provided for a study of the effect of barrel-shaped and bowl-shaped working rollers of a screw rolling piercing mill with guide bars of a 50–200 pipe rolling unit....