Microstructure Study and Biological Application of Laser Selective Melting CoCrMo Alloy
TAO Hongwei1,2, YU Ting1, CAO Mingxuan1, WU Zhongheng3, CAI Zhaobing4, LIU Min2, YAN Xingchen2,*
1 Faculty of Intelligent Manufacturing, Wuyi University, Jiangmen 529000, Guangdong, China 2 National Engineering Laboratory of Modern Materials Surface Engineering Technology, Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China 3 Guangzhou Boshi Animal Hospital, Guangzhou 510030, China 4 Key Laboratory of Metallurgical Equipment and Control Technology, Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
Abstract: Selective laser melting (SLM) technology is a near-net-shaping method that can rapidly prepare complex structural parts. Due to its high degree of freedom in spatial manufacturing, it has a very broad application prospect in personalized medical treatment. This study focuses on the effect of laser energy density (Ev) on the microstructure and formability of CoCrMo alloy, and systematically explores SLM CoCrMo alloy in terms of density, microstructure and mechanical strength. The effect of Ev on the microstructure and defects of CoCrMo alloy was analyzed. The optimal parameters (laser power=165 W, scanning speed=1 050 mm/s) were obtained with low porosity (0.18%), fine grain structures (0.31 μm) and excellent mechanical properties (tensile strength=1 157 MPa, microhardness=421.53HV0.1). Starting from the needs of patients for biological knee implants, the design method of a biological total knee implant with bone trabecular structure on the bone contact surface was explored, and in-situ knee replacement experiments in large animals were carried out. Postoperative imaging examination found that the 3D printed knee prosthesis can not only accurately replace the original diseased joint parts, but also promote the recovery of the original walking posture of the experimental dog as soon as possible, without dislocation and other complications. The successful implementation of this study provides a strong theoretical basis and data support for the clinical use of 3D printed biological total knee replacement.
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2024, Vol. 38 
