Abstract
Heat treatments are frequently used to modify the microstructure of cast irons according to experimental parameters. Among these, laser surface engineering (LSE) has become relevant for being a highly localized treatment with rapid heating and cooling of the irradiated area resulting in minimal distortion of the workpiece. This work presents and experimentally validates a thermo-metallurgical model able to predict the phase transformations occurring during the LSE treatment of nodular cast iron when it is subjected to different laser beam powers and scanning velocities. For this purpose, an experimental characterization of the thermal history and final microstructure is performed for several operating scenarios. In particular, significant changes in the microstructure can be seen at high powers and low scanning velocity where the matrix is transformed into ledeburite and martensite. The final phase volume fractions predicted by the proposed model along the depth of the sample are compared with the corresponding experimental measurements. The results obtained in the simulation are in good agreement with the experimental measurements. This work highlights the use of our model to be systematically applied for the design and optimization of LSE treatments on cast irons.
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Acknowledgments
A. Boccardo is a member of the research staff of CONICET and he acknowledges the financial support received of the ASUTNCO0007785 Grant from Universidad Tecnológica Nacional. D. Celentano thanks the financial support of ANID-Chile through the project Grant FONDECYT 1180591. E. Ramos-Moore thanks the financial support of ANID-Chile through the project Grant FONDECYT 1180564.
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Manuscript submitted October 2, 2020; accepted December 18, 2020.
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Boccardo, A.D., Catalán, N., Celentano, D.J. et al. A Thermo-metallurgical Model for Laser Surface Engineering Treatment of Nodular Cast Iron. Metall Mater Trans B 52, 854–870 (2021). https://doi.org/10.1007/s11663-021-02058-0
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DOI: https://doi.org/10.1007/s11663-021-02058-0