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

doi:10.1016/j.jmst.2020.04.043

Abstract

Abstract:

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

Hui Xiao, Manping Cheng, Lijun Song. Direct fabrication of single-crystal-like structure using quasi-continuous-wave laser additive manufacturing[J]. J. Mater. Sci. Technol., 2021, 60: 216-221.

Figures/Tables 4

Fig. 1. Microstructures of as-fabricated samples: (a, c) OM and OIM maps of the longitudinal section of the CW sample, respectively; (b, d) OM and OIM maps of the longitudinal section of the QCW-100 sample, respectively; (e, f) OIM maps of the top section of the CW sample and the QCW-100 sample, respectively; (g, h) (100) pole figures corresponding to (c) and (e), respectively; (i, j) (100) pole figures corresponding to (d) and (f), respectively (BD: building direction; SD: scanning direction).

Fig. 2. Microstructures of as-fabricated samples: (a, b) OM images of the CW sample; (c, d) OM images of the QCW-100 sample; (e, f) SEM images of the QCW-100 sample.

Fig. 3. The variations of the molten-pool temperature at different laser processing modes: (a) transient temperature and (c) fixed-point temperature; (b) and (d) are magnified images of areas marked by rectangles in (a) and (c), respectively.

Fig. 4. (a) The molten-pool geometry, the main heat flow direction and dendrite growth direction of the QCW-100 sample; (b) the re-melting of the molten pool between two adjacent pulses; (c) maximum heat flow direction (MHFD) of the QCW-100 sample and (d) solidification pattern (SP) of the QCW-100 sample.

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