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Evolution of solidification microstructure and dynamic recrystallisation of Inconel 625 during laser solid forming process

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Abstract

This study investigated the evolution of solidification microstructure and dynamic recrystallisation (DRX) during the laser solid forming of the Ni-based Inconel 625 superalloy. The as-deposited microstructure mainly showed epitaxially grown columnar grains with fine equiaxed grains between them. These fine equiaxed grains were formed by the discontinuous DRX (DDRX) and continuous DRX (CDRX) processes, which were induced by the cyclic thermal stress resulting from the repeated laser deposition. The bulging of pre-existing grains and sub-grain rotation were the main mechanisms of the DDRX and CDRX phenomena, respectively. Additionally, after the occurrence of DRX, the dislocations were released and there was no distortion in the recrystallised grains. Coarse equiaxed grains were present in the top zone of the deposit; these grains were formed by the columnar-to-equiaxed transition during the solidification of the molten pool after the end of the laser re-melting and deposition process.

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Acknowledgements

The work was supported by National Natural Science Foundation of China (Nos. 51604227, 51501154 and 51565041), National Key Research and Development Plan of China (No. 2016YFB1100104), the Fundamental Research Funds for the Central Universities of China (Nos. 3102015BJ(II)ZS013 and 3102017jg02013), and the Natural Science Foundation of Shaanxi Province of China (2017JM5052).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 127 Youyixilu, Xi’an, 710072, Shaanxi, People’s Republic of China

    Y. L. Hu, X. Lin, X. F. Lu, S. Y. Zhang, H. O. Yang, L. Wei & W. D. Huang

  2. Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MIIT China, Northwestern Polytechnical University, 127 Youyixilu, Xi’an, 710072, Shaanxi, People’s Republic of China

    Y. L. Hu, X. Lin, X. F. Lu, S. Y. Zhang, H. O. Yang, L. Wei & W. D. Huang

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  1. Y. L. Hu
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  2. X. Lin
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  3. X. F. Lu
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  4. S. Y. Zhang
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Correspondence to X. Lin or W. D. Huang.

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Hu, Y.L., Lin, X., Lu, X.F. et al. Evolution of solidification microstructure and dynamic recrystallisation of Inconel 625 during laser solid forming process. J Mater Sci 53, 15650–15666 (2018). https://doi.org/10.1007/s10853-018-2701-x

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  • DOI: https://doi.org/10.1007/s10853-018-2701-x

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