Characterization and hardness enhancement of amorphous Fe-based metallic glass laser cladded on nickel-free stainless steel for biomedical implant application

Publication date: Available online 14 June 2019Source: Materials Chemistry and PhysicsAuthor(s): Mahmoud Z. Ibrahim, Ahmed A.D. Sarhan, T.Y. Kuo, Farazila Yusof, M. HamdiAbstractAmorphous metals – or Metallic Glass (MG) – have a great potential in bone implant applications because of their exceptional mechanical properties, excellent tribological and corrosion resistance characteristics, and good biocompatibility. An upcoming trend is to develop an amorphous metallic coating on different metallic alloys to promote the hardness of crystalline metallic alloys. In this work, Fe-based amorphous – FeCrMoCB – coating was developed on nickel-free stainless-steel substrate using laser cladding (LC) technique at two laser power levels (1500 and 2000 W) with different scanning speeds to enhance the hardness of the crystalline metallic substrate. Scanning electron microscope (SEM) and X-ray diffraction (XRD) examinations confirmed the formation of both the amorphous structure phase at the coating layer (CL) and crystalline structure phase at the transition layer (TL) at the interface. The experimental results showed that all specimens confirmed amorphous CL. However, at relatively low speed, 5 mm/s at 1500 W and 15 mm/s at 2000 W, the CL exhibited higher crystallinity within the amorphous structure. The micro-hardness was extremely high within higher amorphous content (up to 1300 HV0.1), while the hardness value was degraded when higher crystallinity existed (900 HV0.1). I...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research