J. Mater. Sci. Technol. ›› 2021, Vol. 60: 216-221.DOI: 10.1016/j.jmst.2020.04.043

• Letter • Previous Articles     Next Articles

Direct fabrication of single-crystal-like structure using quasi-continuous-wave laser additive manufacturing

Hui Xiaoa,b,c, Manping Chenga,b, Lijun Songa,b,*()   

  1. a State Key Laboratory of Advanced Design and Manufacturing for Vehicle Bodies, Hunan University, Changsha 410082, China
    b Hunan Provincial Key Laboratory of Intelligent Laser Manufacturing, Hunan University, Changsha 410082, China
    c School of Mechatronics Engineering, Foshan University, Foshan, Guangdong Province, 528001, PR China
  • Received:2020-02-04 Published:2021-01-10 Online:2021-01-22
  • Contact: Lijun Song


The synchronously periodic re-melting of molten pool was firstly introduced in additive manufacturing to promote the epitaxial growth of columnar structure using a novel quasi-continuous-wave (QCW) laser. The epitaxial growth of columnar structure was intensified and the single-crystal-like sample with highly oriented “zigzag” columnar grains was produced. The modified molten-pool geometry and the synchronously high-frequency re-melting of the molten pool contribute to the formation of single-crystal-like structure. This work reports a new route to promote the continuously epitaxial growth of dendrites for fabrication of single-crystal-like sample.

Key words: Laser additive manufacturing, Nickel alloys, Solidification microstructure, Texture, Dendritic growth