Volokitina Irina, Kolesnikov Alexandr, Fediuk Roman, Klyuev Sergey, Sabitov Linar, Volokitin Andrey, Zhuniskaliyev Talgat, Kelamanov Bauyrzhan, Yessengaliev Dauren, Yerzhanov Almas, Kolesnikova Olga
Department of Metallurgy and Mining, Rudny Industrial Institute, Rudny 111500, Kazakhstan.
Department of "Life Safety and Environmental Protection", M. Auezov South Kazakhstan University, Shymkent 160012, Kazakhstan.
Materials (Basel). 2022 Mar 31;15(7):2584. doi: 10.3390/ma15072584.
The paper studies the properties of brass workpieces for antifriction rings under severe plastic deformation by high-pressure torsion. The evolution of microstructure and mechanical properties of deformed workpieces after six cycles of deformation by high-pressure torsion at 500 °C have been studied. All metallographic studies were performed using modern methods: transmission electron microscopy (TEM) and analysis electron back scatter diffraction patterns (EBSD). The deformation resulted in an ultrafine grained structure with a large number of large-angle boundaries. The strength properties of brass increased compared to the initial state almost by three times, the microhardness also increases by three times, i.e., increased from 820 MPa in the initial state to 2115 MPa after deformation. In this case, the greatest increase in strength properties occurs in the first two cycles of deformation.
本文研究了通过高压扭转进行严重塑性变形的减摩环黄铜工件的性能。研究了在500°C下经过六个高压扭转变形循环后变形工件的微观结构和力学性能的演变。所有金相研究均采用现代方法进行：透射电子显微镜（TEM）和分析电子背散射衍射图案（EBSD）。变形导致形成了具有大量大角度边界的超细晶粒结构。与初始状态相比，黄铜的强度性能几乎提高了三倍，显微硬度也提高了三倍，即从初始状态的820 MPa增加到变形后的2115 MPa。在这种情况下，强度性能的最大增加发生在变形的前两个循环中。
