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Surface Laser Treatment on Ferritic Ductile Iron: Effect of Linear Energy on Microstructure, Chemical Composition, and Hardness

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Abstract

Surface transformation treatments like laser surface melting and laser surface hardening have been mostly developed in austempered ductile iron and gray cast iron. In this work, we explore the effects of the linear laser energy of the treatment on the microstructure, chemical composition, and hardness of ferritic nodular cast iron, using a fiber delivery diode laser. We found changes in the microstructure above 120 J/mm, characterized by the presence of graphite nodules surrounded by martensitic/dendritic shells. Above 316 J/mm, Fe3C and γ-Fe2O3 phases arise, together with a saturation of the microhardness around 1000 HV0.3 within the first 200 μm of depth, and of the surface hardness around 90 HR15N. Changes in microstructure and composition due to the laser treatment directly affect the thermal diffusion between the surface-modified zones and the nodular cast iron bulk. Our work highlights the importance of the linear energy in the design and planning of laser treatments.

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Acknowledgments

E. Ramos-Moore thanks the financial support of ANID-Chile through the project grants FONDECYT 1180564 and 1181326. D. Celentano thanks the financial support of ANID-Chile through the project grants FONDECYT 1180591 and REDES 150041. We also appreciate the funding of the GDOES equipment through the project FONDEQUIP EQM 160091. 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.

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Authors and Affiliations

  1. Departamento de Ingeniería Mecánica y Metalúrgica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436, Macul, Santiago, Chile

    Néstor Catalán, Diego Celentano & Magdalena Walczak

  2. Instituto de Física, Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Av. Vicuña Mackenna 4860, 7820436, Macul, Santiago, Chile

    Esteban Ramos-Moore

  3. Centro de Investigación en Nanotecnología y Materiales Avanzados (CIEN-UC), Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436, Macul, Santiago, Chile

    Esteban Ramos-Moore, Diego Celentano & Magdalena Walczak

  4. Instituto de Estudios Avanzados en Ingeniería y Tecnología, IDIT, CONICET-Universidad Nacional de Córdoba, Vélez Sarsfield 1611, X5000, Córdoba, Argentina

    Adrián Boccardo

  5. Grupo de Investigación y Desarrollo en Mecánica Aplicada, GIDMA, Facultad Regional Córdoba, Universidad Tecnológica Nacional, Maestro M. López esq. Cruz Roja Argentina, X5000, Córdoba, Argentina

    Adrián Boccardo

  6. Commonwealth Scientific and Industrial Research Organization (CSIRO), Melbourne, VIC, 3169, Australia

    Nazmul Alam & Dayalan Gunasegaram

Authors
  1. Néstor Catalán
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  2. Esteban Ramos-Moore
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  3. Adrián Boccardo
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  4. Diego Celentano
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  5. Nazmul Alam
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  6. Magdalena Walczak
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  7. Dayalan Gunasegaram
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Corresponding author

Correspondence to Diego Celentano.

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Manuscript submitted July 22, 2020; accepted December 3, 2020.

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Catalán, N., Ramos-Moore, E., Boccardo, A. et al. Surface Laser Treatment on Ferritic Ductile Iron: Effect of Linear Energy on Microstructure, Chemical Composition, and Hardness. Metall Mater Trans B 52, 755–763 (2021). https://doi.org/10.1007/s11663-020-02050-0

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  • DOI: https://doi.org/10.1007/s11663-020-02050-0

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