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Effect of Co on Microstructure Transformation and refinement Mechanism of Undercooled Cu-Ni Alloy

Journal of Wuhan University of Technology(Materials Science) 2023年第4期38卷 877-884页

作者： Willey Liew Yun Hsien 安洪恩 Nancy Julius Siambun Bih-Lii Chuab Faculty of Engineering University Malaysia SabahKota Kinabalu88400Malaysia College of Mechanical and Electronic Engineering Huanghe Jiaotong UniversityJiaozuo454950China Henan Engineering Technology Research Center on Intelligent Manufacturing Technology and Equipment Jiaozuo454950China

关键词： rapid solidification undercooling microstructure refinement structure

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Microstructure Transformation and refinement Mechanism of Undercooled Cu-Ni-Co Alloy Based on Simulation of Critical Cutting Speed in Ultrasonic Machining

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Journal of Wuhan University of Technology(Materials Science) 2023年第6期38卷 1472-1483页

作者： HE Xiaoyu HOU Kai XU Xuguang TANG Cheng ZHU Xijing School of Mechanical Engineering North University of ChinaTaiyuan 030051China

Both Cu60Ni38Co2 and Cu60Ni40 alloy were naturally cooled after rapid solidification from the liquid *** transformation law of the microstructure characteristics of the rapidly solidified alloy with the change of undercooling(ΔT)was systematically *** is found that the two alloys experience the same transformation *** refinement structures under different undercoolings were characterized by electron backscatter diffraction(EBSD).The results show that the characteristics of the refinement structure of the two alloys with low undercooling are the same,but the characteristics of the refinement structure with high undercooling are *** transmission electron microscopy(TEM)results of Cu60Ni38Co2 alloy show that the dislocation network density of low undercooled microstructure is lower than that of high undercooled *** combining EBSD and TEM,it could be confirmed that the dendrite remelting fracture is the reason for the refinement of the low undercooled structure,while the high undercooled structure is refined due to *** this basis,in the processing of copper base alloys,there will be serious work hardening phenomenon and machining hard problem of consciousness problems caused by excessive cutting force.A twodimensional orthogonal turning finite element model was established using ABAQUS software to analyze the changes in cutting speed and tool trajectory in copper based alloy ultrasonic elliptical vibration *** results show that in copper based alloy ultrasonic elliptical vibration turning,cutting process parameters have a significant impact on cutting *** reasonable process parameters can effectively reduce cutting force and improve machining quality.

关键词： rapid solidification undercooling microstructure refinement structure ultrasonic elliptical vibration turning cutting speed finite element analysis

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