Influence of Solidification Conditions on the Microstructure of Laser-Surface-Melted Ductile Cast Iron

Damian Janicki; Jacek Górka; Waldemar Kwaśny; Wojciech Pakieła; Krzysztof Matus

doi:10.3390/ma13051174

Influence of Solidification Conditions on the Microstructure of Laser-Surface-Melted Ductile Cast Iron

Materials (Basel). 2020 Mar 6;13(5):1174. doi: 10.3390/ma13051174.

Authors

Damian Janicki¹, Jacek Górka¹, Waldemar Kwaśny², Wojciech Pakieła², Krzysztof Matus²

Affiliations

¹ Department of Welding, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice; Poland.
² Department of Engineering Materials and Biomaterials, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland.

Abstract

The thermal conditions in the molten pool during the laser surface melting of ductile cast iron EN-GJS-700-2 were estimated by using infrared thermography and thermocouple measurements. The thermal data were then correlated with the microstructure of the melted zone. Additionally, the thermodynamic calculations of a Fe-C-Si alloy system were performed to predict the solidification path of the melted zone. It was found that increasing the cooling rate during solidification of the refined ledeburite eutectic but also suppressed the martensitic transformation. A continuous network of plate-like secondary cementite precipitates and nanometric spherical precipitates of tertiary cementite were observed in regions of primary and eutectic austenite. The solidification of the melted zone terminated with the Liquid → γ-Fe + Fe₃C + Fe₈Si₂C reaction. The hardness of the melted zone was affected by both the fraction of the retained austenite and the morphology of the ledeburite eutectic.

Keywords: cooling rate; ductile cast iron: secondary cementite; laser surface melting; tertiary cementite; thermography.