Abstract
A differential speed rolling (DSR) technique that provides capability of producing large-scale materials with fine grains and controlled texture in a continuous manner has attracted several researchers and industries. In this study, we tried to review the articles related to DSR and especially the high-ratio DSR (HRDSR) technique that is associated with a high speed ratio between the upper and lower rolls (≥2) and compare the change in microstructure and mechanical properties after HRDSR with the results obtained by using other severe plastic deformation (SPD) techniques to see the potential of the HRDSR technique in enhancing the mechanical properties of metals and metal matrix composites. The reviewed results show that HRDSR is an important technique that can effectively refine the grains to micro or nano sizes and uniformly disperse the particles or reinforcement throughout the matrix, which helps extensively in improving ambient and superplastic mechanical properties of various metals and alloys.
Highlights
Microstructural parameters such as grain size, texture, dislocation density and second phases determine the materials properties and they are changed by the processing techniques and conditions [1,2,3]
Severe plastic deformation (SPD) is an applicable process that can be used to effectively change the mechanical properties of materials. This process is a general term of metalworking, denoting any process that applies large strain to materials at low and intermediate temperatures, resulting in an ultrafine grain (UFG) (≤1 μm) or even nanocrystalline (NC) structure (≤100 nm) [4]
The size and fraction of high-angle grain boundaries (HAGBs, θ > 15◦ ), which are analyzed with the aid of grain size and fraction of high-angle grain boundaries (HAGBs, θ > 15°), which are analyzed with the orientation imaging imaging microscopy softwaresoftware (TSL-OIM), as a function of speedofratio hasratio been drawn aid of orientation microscopy (TSL-OIM), as a function speed has been in
Summary
Understanding the effect of microstructural parameters reveals the progressing route for new materials with advanced properties. It is worth knowing all the capabilities and limitations of various processes to achieve the desired microstructure for specified mechanical properties. Severe plastic deformation (SPD) is an applicable process that can be used to effectively change the mechanical properties of materials. This process is a general term of metalworking, denoting any process that applies large strain to materials at low and intermediate temperatures, resulting in an ultrafine grain (UFG) (≤1 μm) or even nanocrystalline (NC) structure (≤100 nm) [4]
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