Abstract
In recent years, ultrafine-grained steel has been gaining increasing attention as a high-performance material. Accordingly, it is necessary to develop an efficient production method for ultrafine-grained steel. Severe plastic deformation is a critical factor that causes grain subdivision into ultrafine grains less than 1 µm in diameter. In this study, the effects of plastic deformation on the microstructure and static recrystallization of pure iron were studied by comparing orthogonal cutting and rolling. Orthogonal cutting yielded ultrafine grains with a diameter of 0.2 µm. It was found that a high strain rate in the thin shear plane generated during the cutting process caused a uniform subdivision of grains, and this uniform plastic deformation resulted in the uniform recrystallization of grains. In addition, a theoretical model was developed, and it was revealed that the number of recrystallized grains depended on the fraction of a large-misorientation area constructed with geometrically necessary boundaries (GNBs). It was suggested that the cutting process was more advantageous than rolling in producing ultrafine recrystallized grains because cutting could apply severe plastic strain uniformly on a work material, effectively generating GNBs.
Highlights
In recent years, the reduction of energy consumption and conservation of natural resources have become increasingly important to achieve the goal of sustainable development
Thedeformation grains of a chip were uniformly into on ultrafine influence of plastic on specimen microscopic plastic strainsubdivided in grains and static
The grains of a chip specimen were uniformly subdivided into ultrafine grains by severe shear deformation with aare high strain rateas infollows: the thin shear plane
Summary
The reduction of energy consumption and conservation of natural resources have become increasingly important to achieve the goal of sustainable development. The improvement of material properties is essential to increase energy efficiency and resource conservation in all technical fields, and further development is required. TMCP is a technology to control the microstructure of metallic materials by adjusting the conditions of the metal formation processes. This is based on metallurgical phenomena, such as phase transformation and recrystallization, which are induced by the stored energy provided by the formation process [2]. The advantage of TMCP is that it requires fewer or no additional alloy elements to control metallurgical phenomena. It is preferable for material recycling and saving resources
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