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Laser surface texturing of gray cast iron for improving tribological behavior

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Abstract

Laser surface texturing process involves creation of microfeatures, e.g., tiny dimples, usually distributed in a certain pattern, covering only a fraction of the surface of the material that is being treated. The process offers several advantages for tribological applications, including improved load capacity, wear resistance, lubrication lifetime, and reduced friction coefficient. In the present study, the surface modification of gray cast iron, using millisecond (λ = 1,064 nm), nanosecond (λ = 1,064 nm) and femtosecond (λ = 800 nm) pulse duration laser irradiation, is adopted to establish a particular geometrical pattern with dimple features and dimensions, to improve wear and friction behavior. The effect of various laser processing parameters, including laser pulse energy, pulse duration and processing speed, on the performance characteristics of the laser-treated samples is investigated. The microtextured surfaces were produced on gray cast iron using different millisecond (0.5 ms), nanosecond (40 ns) and femtosecond (120 fs) laser source with the dimple depth between 3 and 15 μm. The coefficient of friction for the untextured surface was ~0.55, millisecond laser textured ~0.31, nanosecond laser textured ~0.02 and femtosecond laser ~0.01, under normal force of 50 N and sliding speed of 63 mm/s. Surface texturing of the gray cast iron surface using femtosecond pulse duration resulted in significant improvement in wear resistance in comparison to the untextured as well as millisecond and nanosecond laser-textured surface.

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Acknowledgments

The authors are grateful to Craig Dinkel of National Research Council Canada for assistance with the femtosecond and nanosecond laser texturing experiments. The authors gratefully appreciate financial support provided by the Department of Science and Technology (DST), India and ARCI, India.

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Authors and Affiliations

  1. International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad, 500005, India

    Ravi Bathe, V. Sai Krishna & G. Padmanabham

  2. Automotive Portfolio, National Research Council Canada, 800 Collip Circle, London, ON, N6G 4X8, Canada

    S. K. Nikumb

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  1. Ravi Bathe
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  2. V. Sai Krishna
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  3. S. K. Nikumb
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  4. G. Padmanabham
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Correspondence to Ravi Bathe.

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Bathe, R., Sai Krishna, V., Nikumb, S.K. et al. Laser surface texturing of gray cast iron for improving tribological behavior. Appl. Phys. A 117, 117–123 (2014). https://doi.org/10.1007/s00339-014-8281-y

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  • DOI: https://doi.org/10.1007/s00339-014-8281-y

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