J. Mater. Sci. Technol. ›› 2024, Vol. 193: 226-243.DOI: 10.1016/j.jmst.2023.12.037

• Research Article • Previous Articles     Next Articles

Ultrasonic machining response and improvement mechanism for differentiated bio-CoCrMo alloys manufactured by directed energy deposition

Hao Lua,b,1, Lida Zhua,1,*, Pengsheng Xuea, Boling Yana, Yanpeng Haoa, Zhichao Yanga, Jinsheng Ninga, Chuanliang Shia, Hao Wangb,*   

  1. aSchool of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
    bDepartment of Mechanical Engineering, College of Design and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
  • Received:2023-10-30 Revised:2023-11-30 Accepted:2023-12-16 Published:2024-09-10 Online:2024-09-05
  • Contact: *E-mail addresses: neulidazhu@163.com (L. Zhu), mpewhao@nus.edu.sg (H. Wang).
  • About author:1These authors contributed equally to this work.

Abstract: The post-fabrication machining of additively manufactured biomedical parts is essential for achieving dimensional accuracy. However, conventional machining encounters issues in dealing with the growing demand for surface quality and the inherent defects of parts. To improve the machining quality, the correlation between material variations and ultrasonic machining quality is investigated in terms of material properties. This variation induced by additive strategies is experimentally revealed and the mechanism for this difference is further explained through molten pool dynamic simulation. In addition, to elucidate the unique machining advantages, a hybrid cutting simulation is implemented to analyze the improving behavior of ultrasonic vibration on the common defects of additively manufactured parts. Taken together, this study demonstrates the role that material property differences play in post-fabrication machining and validates the superiority of ultrasonic machining as a post-fabrication machining method for additively manufactured parts.

Key words: Additive manufacturing, Ultrasonic vibration, Bio-CoCrMo, Simulation, Defects