Radial-Shear Rolling Techniques for Alloy Processing

Radial-shear rolling is a severe plastic deformation process that combines compressive and shear forces via specialised roll geometry to generate a vortex‐type metal flow. By passing a workpiece through a three-high rolling mill with inclined rolls, this technique imposes non-uniform strain across the billet’s cross section, yielding a gradient microstructure with an ultrafine-grained periphery and a comparatively coarser core. Such controlled grain refinement enhances strength, hardness and fatigue resistance while preserving ductility. Its adaptability to steels, aluminium, titanium and zirconium alloys underpins applications ranging from nuclear components to aerospace and biomedical devices. Continuous processing capability and compatibility with conventional rolling equipment support industrial scalability, offering an energy-efficient route to high-performance bars and rods. Advances in simulation and in-line monitoring have improved predictive control of temperature, strain distribution and residual stress, further accelerating deployment in modern alloy production.

Research from Nature Portfolio

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Research from all publishers

One study applied radial-shear rolling to small ingots of modified 12% Cr stainless steel, reducing diameter from 32 mm to 13 mm over nine passes. This single-operation process transformed a coarse dendritic cast structure (0.5–1.5 mm) into an equiaxed ultrafine-grained periphery (1–4 μm) with elongated axial texture, demonstrating deep processing capability for high-strength corrosion-resistant bars. Another investigation examined temperature effects on strain-speed parameters during radial-shear rolling of an Al-Zn-Mg-Ni-Fe alloy. Finite element analysis and rheological testing revealed that a 100 °C reduction in rolling temperature mimics a 4° decrease in feed angle, prolongs deformation time and increases non-uniformity, enabling control of surface tightening and gradient structure formation. A further work combined FEM simulation and experimental trials on Ti-6Al-4V billets. It identified a neutral layer between slowing peripheral segments and accelerating central regions, and correlated accumulated strain with the thickness of refined ultrafine outer zones. This integration of modelling and practice validated strategies for tailoring peripheral grain size and central core characteristics in titanium rods.

Radial-Shear Rolling Techniques for Alloy Processing publication trend

The graph below shows the total number of articles in radial-shear rolling techniques for alloy processing across all publications each year (not limited to Nature Index journals).

Technical terms

Radial-Shear Rolling (RSR): A rolling process using inclined rolls to impose combined shear and compressive deformation, generating vortex metal flow and gradient microstructures.

Ultrafine-Grained (UFG) Structure: A metallurgical state with average grain size below 1 µm, leading to enhanced strength and hardness.

Neutral Layer: Transitional region in a rolled billet where the direction of metal flow changes between accelerated central zones and decelerated peripheral zones.

Shear Strain: Angular deformation induced within the workpiece by non-uniform roll contact, contributing to grain fragmentation and refinement.

References

1. Using the Radial Shear Rolling Method for Fast and Deep Processing Technology of a Steel Ingot Cast Structure. Materials (2023).
2. Analysis of Temperature Influence on Strain–Speed Parameters of Radial-Shear Rolling of Al-Zn-Mg-Ni-Fe Alloy. Materials (2022).
3. Simulation of the Kinematic Condition of Radial Shear Rolling and Estimation of Its Influence on a Titanium Billet Microstructure. Materials (2022).