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Sensitivity of Liquation Cracking to Deposition Parameters and Residual Stresses in Laser Deposited IN718 Alloy

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Abstract

The laser deposited IN718 alloys were fabricated with laser cladding system under different conditions to estimate the sensitivity of weld metal liquation cracking. The microstructure and the crack characterization of the laser deposited IN718 alloy were investigated, and the effect of metallurgical factors and residual stress on the crack sensitivity was analyzed. The results showed that the continuous dendritic Laves was precipitated and formed a Lave–austenite interface with ambiguous nanohardness distribution. The weld metal liquation cracking was propagated along the laser scanning direction and the buildup direction in the laser deposited IN718 alloy simultaneously, and the Nb-/Mo-riched fine granular clusters were formed in the crack surface. The precipitation amount of the coarse eutectic phases, presented as dendrite or network, was increased in the laser deposited alloy fabricated with IN718/C-Fe-Cr composite powder and slow cooling rate. The total crack length and the maximum crack length were decreased by increasing cooling rate, and the transverse residual stress was increased with increasing buildup layer number. The crack sensitivity of the laser deposited IN718 alloy was increased by the crack initiation provided by the metallurgical defects and the eutectic phases with low melting temperatures, and then, crack propagated along the continuous phase under the transverse residual stress.

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Acknowledgments

This research was financially supported by the National Natural Science Foundation of China (Grant Nos. 51401037, 51601172); the Science and Technology Program of Jiangsu Province of China (Grant No. BK20141228); and the Science and Technology Program of Suzhou (Grant No. SYG201421).

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Authors and Affiliations

  1. School of Automotive Engineering, Changshu Institute of Technology, Jiangsu, People’s Republic of China

    Yaocheng Zhang, Li Yang, Tingyi Chen & Weihui Zhang

  2. Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control, Xuzhou Institute of Technology, Jiangsu, People’s Republic of China

    Yaocheng Zhang & Li Yang

  3. Ningbo Branch Under China Weapons Scientific Research Institute, Ningbo, Zhejiang, People’s Republic of China

    Song Pang

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  1. Yaocheng Zhang
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Correspondence to Yaocheng Zhang.

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Zhang, Y., Yang, L., Chen, T. et al. Sensitivity of Liquation Cracking to Deposition Parameters and Residual Stresses in Laser Deposited IN718 Alloy. J. of Materi Eng and Perform 26, 5519–5529 (2017). https://doi.org/10.1007/s11665-017-2966-2

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  • DOI: https://doi.org/10.1007/s11665-017-2966-2

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