Effect of Processing Route on Microstructure and Mechanical Properties in Single-Roll Angular-Rolling

Abstract

This paper reports the effect of the processing route on the microstructure and mechanical properties in the pure copper sheets processed by single-roll angular-rolling (SRAR). The SRAR process was repeated up to six passes in two processing routes, called routes A and C in equal-channel angular pressing. As the number of passes increased, the heterogeneous evolution of hardness and microstructural heterogeneities between the core and surface regions gradually became intensified in both processing routes. In particular, route A exhibited more prominent partial grain refinement and dislocation localization on the core region than route C. The finite element analysis revealed that the intense microstructural heterogeneities observed in route A were attributed to effective shear strain partitioning between the core and surface regions by the absence of redundant strain. On the other hand, route C induced reverse shearing and cancellation of shear strain over the entire thickness, leading to weak shear strain partitioning and delayed grain refinement. Ultimately, this work suggests that route A is the preferred option to manufacture reverse gradient structures in that the degree of shear strain partitioning and microstructural heterogeneity between the core and surface regions is more efficiently intensified with increasing the number of passes.

Microstructures and properties of ultrasonically surface-modified Cu–0.2Be–1.0Co alloy

“…The high frequency impact can induce plastic deformation and compress residual stress in the metal surface layer, which will generate gradient grain refinement microstructures as well as dense dislocations and consequently lead to surface strengthening [21,22]. Compared with other surface plastic deformation methods, such as high-pressure torsion [23], singleroll angular-rolling [24], laser shock peening and ultrasonic shot peening [25][26][27], USM exhibits precise controllability, complex geometric processing capability, less surface deterioration, high work efficiency, low cost and easy operability [28][29][30].…”

DRECE forming method as a way to improve metals and alloys for advanced structural and functional application

“…In general, materials with small grain sizes have several advantages over their coarse-grained counterparts because they have higher strength and other favorable properties including a potential for use in superplastic forming operations at elevated temperatures. This significance was recognized several years ago and led to the concept of nanocrystalline materials which were discussed in detail in an early review [1,12,14]. A possible way for microstructure refinement of metals is the use of SPDprinciple on the base of thermomechanical processing [2,3,4,7,13,15].…”

Effect of Processing Route on Microstructure and Microhardness of Low-Carbon Steel Subjected to Drece Process

“…Currently, there are a large number of continuous SPDs, which show interesting results, especially in terms of refining the structure and increasing the level of mechanical and physical properties. Among the most promising are the Single Roll Angular Rolling (SRAR) [2] or Equal Channel Angular Rolling (ECAR) [3] methods, which enable the preparation of UFG structures in massive samples of large lengths.…”