Study on the microstructure and properties of a laser cladding Fe-Ni-Al coating based on the invar effect.
Sci Rep
; 14(1): 11685, 2024 May 22.
Article
de En
| MEDLINE
| ID: mdl-38778176
ABSTRACT
The purpose of this study was to investigate the effect of Al content on Fe-Ni-Al coatings. A Fe-Ni-Al coating was prepared using a semiconductor laser, and the influence of the Al content on the microstructure and properties of the coating was examined. The microstructure of the coating was characterized using scanning electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy. The coefficient of thermal expansion of the coating was measured using a static thermomechanical analyzer. The microhardness and wear performance of the coating were analyzed using a microhardness tester and a wear testing machine. The results were as follows. The addition of Al to the Fe-Ni ferroalloy powder resulted in the in situ formation of an AlNi/Fe-Ni laser cladding layer. When the Al content was low, the coating mainly consisted of γ-[Fe,Ni] austenite. As the Al content increased, the matrix phase structure of the cladding layer transformed into the α phase. Consequently, the Invar effect was gradually compromised, leading to the generation of defects in the coating. When the Al content was 4%, the coating performance improved while maintaining a low coefficient of thermal expansion. At this point, there were relatively few cracks in the cladding layer, and it exhibited the best wear resistance.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Langue:
En
Journal:
Sci Rep
Année:
2024
Type de document:
Article
Pays d'affiliation:
Chine