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Effect of Cooling Rate on the Microstructure of Laser-Remelted INCONEL 718 Coating

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Abstract

The rapid cooling rate was achieved during laser remelting with high scanning speed. The microstructure and precipitations in the INCONEL 718 remelted layer were investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), and solid phase microextraction (SPME). The phase transition temperatures were carried out by differential thermal analysis (DTA). The results showed that columnar-dendritic and equiaxial structures appeared in different regions of the remelted layer. The dendritic spacing of the columnar dendrite and equiaxed grain size decreased with increasing scanning speed. The precipitations in the remelted layer consisted of Laves, granular phase, and a small quantity of quadrangular nitride (Ti, Nb)N. The granular phase Nb(Al, Ti) was precipitated at about 1272 K (999 °C) with the spontaneous decomposition of the supersaturation Laves during the cooling stage, and the small-size granule became coarsened to 0.2 to 0.9 μm during the cooling stage. The noncoherent relationship existed between the granular phase and austenite, and the coarsening of granule was related to the cube root of the diffusion coefficient, interfacial energy, and diffusion time. The microhardness of the remelted layer was increased by increasing the cooling rate due to the Nb atomic solid solution strengthening caused by the distorted elastic stress field and the short-range internal stress.

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Notes

  1. INCONEL 718 is a trademark of Special Metals Corporation, Huntington, WV.

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Acknowledgments

This research was funded by the financial support of the Ministry of Science and Technology of the People’s Republic of China (Grant No. 2009DFB50350) and the National Natural Science Foundation of China (Grant No. 50971091).

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Authors and Affiliations

  1. Department of Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Yaocheng Zhang (Ph.D. Candidate), Zhuguo Li (Professor), Pulin Nie (Assistant Researcher) & Yixiong Wu (Professor)

  2. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, People’s Republic of China

    Yixiong Wu (Professor)

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  1. Yaocheng Zhang
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  2. Zhuguo Li
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  3. Pulin Nie
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  4. Yixiong Wu
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Correspondence to Yaocheng Zhang.

Additional information

Manuscript submitted November 21, 2012.

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Zhang, Y., Li, Z., Nie, P. et al. Effect of Cooling Rate on the Microstructure of Laser-Remelted INCONEL 718 Coating. Metall Mater Trans A 44, 5513–5521 (2013). https://doi.org/10.1007/s11661-013-1903-8

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