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Laser solid forming assisted by friction stir processing for preparation of Ni–16Cr–8Fe alloys: Crack repairing and grain refinement

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Abstract

Although laser solid forming (LSF) has a wide range of applications in material manufacturing, the technique has been severely limited due to the solidification cracks during rapid laser melting/solidification. In this paper, an LSF technology assisted by friction stir processing (FSP) is proposed to eliminate the LSF crack through the FSP thermomechanical coupling effect, with the Ni–16Cr–8Fe alloy as a representative material. By FSP-assisted LSF, the cracks at the top surface of the Ni–16Cr–8Fe alloy layer were eliminated. Meanwhile, the severe plastic deformation layers can be observed and gradient grains with tens of nanometers to tens of micrometers from the top surface to the inner. The LSF-printed dendrite microstructure was transformed into nanocrystals or nanotwins in the deformation zone with twining as the main deformation mechanism. The grain refinement results in the increase of hardness about 30%.

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ACKNOWLEDGMENTS

The authors wish to acknowledge the financial support of National Natural Science Foundation of China (51505166, 51474245, and 51771233), National Key Research and Development Program “Additive Manufacturing and Laser Manufacturing” (2016YFB1100101), and Hunan Natural Science Foundation (2018JJ3659).

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha, 410083, People’s Republic of China

    Pengda Niu, Ruidi Li, Tiechui Yuan, Minbo Wang, Siyao Xie & Hong Wu

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  1. Pengda Niu
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  2. Ruidi Li
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  3. Tiechui Yuan
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  4. Minbo Wang
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  5. Siyao Xie
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  6. Hong Wu
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Correspondence to Ruidi Li or Tiechui Yuan.

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Niu, P., Li, R., Yuan, T. et al. Laser solid forming assisted by friction stir processing for preparation of Ni–16Cr–8Fe alloys: Crack repairing and grain refinement. Journal of Materials Research 33, 3521–3529 (2018). https://doi.org/10.1557/jmr.2018.199

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  • DOI: https://doi.org/10.1557/jmr.2018.199

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