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

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...

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Bibliographic Details
Published in:Materials 2020-03, Vol.13 (5), p.1174
Main Authors: Janicki, Damian, Górka, Jacek, Kwaśny, Waldemar, Pakieła, Wojciech, Matus, Krzysztof
Format: Article
Language:English
Subjects:
Alloy systems
Calibration
Cameras
Cast iron
Cementite
Chemical precipitation
Cooling rate
Equilibrium
Eutectics
Infrared imaging
Iron carbides
Lasers
Martensitic transformations
Mechanical properties
Methods
Microstructure
Morphology
Nodular iron
Precipitates
Retained austenite
Scanning electron microscopy
Silicon base alloys
Software
Solidification
Temperature
Thermocouples
Thermography
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Summary: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 + Fe C + Fe Si C reaction. The hardness of the melted zone was affected by both the fraction of the retained austenite and the morphology of the ledeburite eutectic.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13051174