Study on Removal Behavior of Directionally Solidified Nickel-based Superalloy with Ultrasonic Assisted Scratching of Diamond Indenter

doi:10.3901/JME.260033

Abstract

Abstract: Directionally solidified nickel-based superalloy without the transverse grain boundary can be used in the manufacture of aero-engine turbine blades because the temperature-bearing capacity of the material is greatly improved. However, the alloy has poor machinability and anisotropic mechanical properties, making it difficult to guarantee the surface quality after grinding. Ultrasonic-assisted scratching experiments are conducted to investigate the removal behavior of directionally solidified nickel-based superalloy material. The impacts of material anisotropy and ultrasonic action on the scratching force, material removal, and surface quality are analyzed. The results indicate that the material direction exerts a remarkable influence on the scratching force. When the transverse and longitudinal surfaces of the material are scratched respectively, the transverse scratching force is 23% lower than the longitudinal scratching force. Meanwhile, the mean value of the ultrasonic-assisted scratching force is 37% lower than that of the convention scratching force. The material direction significantly impacts the amount of material removal. The amount of material removed is lower on the transverse surface, reaching its maximum on the longitudinal surface. Moreover, the amount of material removed through the ultrasonic-assisted scratching is greater than that during the convention scratching. The scratch-machined surface exhibits defects such as rolling and debris. The longitudinal surface of the material has fewer surface defects and a smaller surface roughness when scratched, making it the optimal material direction for material scratching. Additionally, the surface defects of ultrasonic-assisted scratch-machined surfaces are fewer than those of convention scratch-machined surfaces. The findings offer a novel approach for the high-quality processing of directionally solidified nickel-based superalloy.

Key words: directionally solidified nickel-based superalloy, anisotropy, ultrasound-assisted scratching, material removal behavior

CLC Number:

TG156

ZHU Pingzhong, ZHU Xianglong, ZHANG Jing, XU Nianwei, WEI Yuxin, DONG Zhigang. Study on Removal Behavior of Directionally Solidified Nickel-based Superalloy with Ultrasonic Assisted Scratching of Diamond Indenter[J]. Journal of Mechanical Engineering, 2026, 62(1): 448-456.

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