期刊
ADVANCED ENGINEERING MATERIALS
卷 24, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202100928
关键词
CoCrMo alloys; heat treatments; mechanical properties; selective laser melting; wear
资金
- Universita degli Studi di Brescia within the CRUI-CARE Agreement
The study shows that vacuum heat treatments and hot isostatic pressing have different effects on the properties of SLM CoCrMo alloy, highlighting the importance of selecting the right treatment method to enhance specific mechanical properties.
A deep knowledge of material properties is fundamental to obtain high-performance medical implants realized with CoCrMo alloy manufactured by selective laser melting (SLM), even more so when considering that heat treatments (HTs) are often necessary to refine the microstructure, eliminate residual stress, and improve mechanical properties. To this aim, herein, SLM CoCrMo alloy samples are produced in six different treatment conditions: as built (AB), four different vacuum HTs, and hot isostatic pressing (HIP). Modifications to microstructure, hardness, tensile behavior, and wear resistance are then investigated. Results reveal that vacuum HTs and HIP have different effects on microstructure and types of defects with respect to the AB condition. Thus, proper selection of the treatment is mandatory to improve specific mechanical properties, such as strength, ductility, hardness, or tribological response. In this context, it is confirmed that the choice of an appropriate HT allows SLM CoCrMo to reach the target mechanical properties set by international standards for applications in the medical field, such as dentistry or orthopedics.
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