Abd El Aal Mohamed Ibrahim, El-Fahhar Hossam Hemdan, Mohamed Abdelkarim Yousif, Gadallah Elshafey Ahmed
Mechanical Engineering Department, College of Engineering at Wadi Addawaser, Prince Sattam Bin Abdulaziz University, Wadi Addawaser 18734, Saudi Arabia.
Mechanical Design & Production Department, Faculty of Engineering, Zagazig University, Zagazig 44519, Egypt.
Materials (Basel). 2022 Apr 20;15(9):2985. doi: 10.3390/ma15092985.
The influence of the number of passes and the tube materials on the microstructural evolution, mechanical properties, and wear behavior of Cu and brass tubes after parallel tubular channel angular pressing (PTCAP) was investigated. The grain size decreased to final grain sizes of 138.6 nm and 142.7 nm, after PTCAP of the Cu and brass tubes was conducted in up to 4 and 2 passes, respectively. PTCAP contributes to obtaining an ultra-fine grain (UFG) microstructure, with a mixture of different grain sizes that conferred high hardness. The present results indicate the superior wear resistance of Cu and brass PTCAP tubes, relative to Cu and brass samples that were previously deformed by different severe plastic deformation (SPD) processes. The wear mechanism of the Cu tubes changed from delamination and cracks with a high degree of adhesive wear before PTCAP into a combination of adhesive and abrasive wear, with a decrease in the presence of oxygen content after the PTCAP procedure. The wear mechanism also changed from a combination of adhesive and abrasive mechanisms into abrasive ones with the absence of oxygen after the PTCAP of brass tubes.
研究了道次数量和管材对平行管状通道角挤压(PTCAP)后铜及黄铜管的微观结构演变、力学性能和磨损行为的影响。分别对铜管和黄铜管进行最多4道次和2道次的PTCAP后,晶粒尺寸减小至最终晶粒尺寸138.6纳米和142.7纳米。PTCAP有助于获得具有不同晶粒尺寸混合物的超细晶粒(UFG)微观结构,这种结构赋予了高硬度。目前的结果表明,相对于先前通过不同严重塑性变形(SPD)工艺变形的铜和黄铜样品,铜和黄铜PTCAP管具有优异的耐磨性。铜管的磨损机制从PTCAP之前具有高度粘着磨损的分层和裂纹转变为粘着磨损和磨料磨损的组合,且PTCAP过程后氧含量降低。黄铜管进行PTCAP后,磨损机制也从粘着和磨料机制的组合转变为无氧情况下的磨料机制。