Effect of Heat Treatment on the Properties of CoCrMo Alloy Manufactured by Selective Laser Melting

  • Zhang Guoqing
  • Li Junxin
  • Zhou Xiaoyu
  • Li Jin
  • Wang Anmin
Article
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Abstract

To obtain medical implants with better mechanical properties, it is necessary to conduct studies on the heat treatment process of the selective laser melting (SLM) manufacturing parts. The differential scanning calorimetry method was used to study the heat treatment process of the phase transition of SLM CoCrMo alloy parts. The tensile properties were tested with a tensile test machine, the quantity of carbide precipitated after heat treatment was measured by energy-dispersive x-ray spectroscopy, and the tensile fracture morphology of the parts was investigated using SEM. The obtained results were: Mechanical properties in terms of elongation and tensile strength of CoCrMo alloy manufactured by SLM that had been heat-treated at 1200 °C for 2 h followed by cooling with water were not only higher than the national standard but also higher than the experimental results of the same batch of castings. The mechanism of fracture of parts manufactured by SLM without heat treatment was brittle fracture, whereas parts which had been heat-treated at 1200 °C for 2 h combined with water cooling and at 1200 °C for 1 h with furnace cooling suffered ductile fracture. This study provides the basis for defining the applications for which CoCrMo alloys manufactured by SLM are suitable within the field of medical implants.

Keywords

CoCrMo alloy fracture mechanism microstructure selective laser melting tensile strength 

Notes

Acknowledgments

The study was funded by the Henan Provincial Science and Technology Project (182102310072) and the Start-up Funds for High Level Talents of Zhoukou Normal University (No. ZKNUC72019). Also, this work was supported by Analytical and Testing Center of ZKNUC for carrying out SEM and EDS analysis.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Zhang Guoqing
    • 1
  • Li Junxin
    • 1
  • Zhou Xiaoyu
    • 1
  • Li Jin
    • 1
  • Wang Anmin
    • 2
  1. 1.School of Mechanical and Electrical EngineeringZhoukou Normal UniversityZhoukoPeople’s Republic of China
  2. 2.School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhouPeople’s Republic of China

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