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Microstructural characterization of laser surface-melted Inconel 718

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Abstract

In the present study, a detailed study of the effect of laser parameters on microstructure and phases of the laser surface-melted (using 2 kW continuous wave Yb-fibre laser) Inconel 718 has been carried out. Surface melting has been conducted with a power of 400 watts, scan speed of 500, 750, and 1000 mm/min and with a spot diameter of 3 mm. After laser surface melting, the microstructures, phase, surface roughness and crystallographic orientation (texture) of the melt zone has been carried out. There is refinement of microstructure and change in crystallographic texture which varied with process parameters. The effect of process parameters on the microhardness of the melt zone has been studied in detail.

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Acknowledgement

The financial support from the Department of Science and Technology, Ministry of Science and Technology, Government of India, under the FIST Program-2007 (SR/FIST/ETII-031/2007) for the 2 kW fibre laser is gratefully acknowledged. We are also grateful to Muvvala Gopinath, research scholar of Department of Mechanical Engineering, I.I.T. Kharagpur, for extending their support in carrying out the experiment.

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  1. Sumit K. Sharma, K. Biswas, A. K. Nath, I. Manna, J. Dutta Majumdar authors carry equal credit in this work

Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, 721302, India

    Sumit K. Sharma, K. Biswas, I. Manna & J. Dutta Majumdar

  2. Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, 721302, India

    A. K. Nath

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  1. Sumit K. Sharma
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Sharma, S.K., Biswas, K., Nath, A.K. et al. Microstructural characterization of laser surface-melted Inconel 718. J Opt 49, 494–509 (2020). https://doi.org/10.1007/s12596-020-00649-9

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