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Continuous Differential Speed Rolling for Grain Refinement of Metals: Processing, Microstructure, and Properties
Critical Reviews in Solid State and Materials Sciences ( IF 8.1 ) Pub Date : 2019-01-11 , DOI: 10.1080/10408436.2018.1525528
Kotiba Hamad 1 , Young Gun Ko 2
Affiliation  

In recent years, considerable research has been devoted to the development of ultrafine-grained (UFG) structural metals fabricated by various severe plastic deformation (SPD) techniques. Among these techniques, differential speed rolling (DSR) has been considered as the continuous forming method in which bulk sheet materials pass through two identical rolls with different speeds of the rolls, effectively imposing intense plastic strain based on shear deformation. This review describes the principles of the DSR process, including the strain imposed by DSR, processing routes, and macro-shear characteristics associated with the processing routes; it also outlines the processing factors that affect grain refinement, such as total thickness reduction, thickness reduction per pass, rolling speed, roll speed ratio, number of operations, and rolling temperature. The essential features of the resultant microstructural variables, including the grain size and morphology, grain boundaries, deformation textures, and dislocation density developed in materials with HCP, FCC, and BCC crystals deformed by the DSR process are also summarized. In addition, the structural properties of metals subjected to DSR are reviewed, including strength, hardness, and ductility at room and elevated temperatures.

中文翻译:

用于金属晶粒细化的连续差速轧制:加工,显微组织和性能

近年来,已经进行了大量研究,以开发通过各种严重塑性变形(SPD)技术制造的超细晶粒(UFG)结构金属。在这些技术中,差速轧制(DSR)被认为是连续成型方法,其中散装片材以不同的辊速通过两个相同的辊,从而有效地施加基于剪切变形的强烈塑性应变。这篇综述描述了DSR过程的原理,包括DSR施加的压力,加工路线以及与加工路线相关的宏观剪切特性。它还概述了影响晶粒细化的加工因素,例如总厚度减小,每道次厚度减小,轧制速度,轧制速度比,操作次数,和轧制温度。还总结了所产生的微结构变量的基本特征,包括晶粒尺寸和形貌,晶界,变形织构以及由DSR工艺变形的具有HCP,FCC和BCC晶体的材料中形成的位错密度。此外,还对进行了DSR的金属的结构特性进行了综述,包括在室温和高温下的强度,硬度和延展性。
更新日期:2019-01-13
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