Chunfeng Yu, Yongjun Hu, Bingwen Lu, Wenyou Ma, Yueliang Wang, Dongdong Dong, Min Liu. Effect of Hatch Spacing on Phase-Transformation Behavior and Mechanical Properties of NiTi Shape Memory Alloy Fabricated Using Selective Laser Melting[J]. Laser & Optoelectronics Progress, 2021, 58(19): 1914008
- Laser & Optoelectronics Progress
- Vol. 58, Issue 19, 1914008 (2021)
Fig. 1. Morphology and particle size distribution of Ni50Ti50 powder. (a) Powder morphology; (b) particle size distribution
Fig. 2. Bulk samples and dimension of tensile samples of NiTi alloy fabricated with selected laser melting (SLM)
Fig. 3. Micro appearances of NiTi single track samples fabricated with selected laser melting under different process parameters
Fig. 4. Width of NiTi single track samples fabricated with selected laser melting under different process parameters
Fig. 5. Surface appearances and three-dimensional contour maps of NiTi bulk samples fabricated with constant laser power (P=150 W) and scanning speed (v=1100 mm/s), but different hatch spacing values. (a) h=115 μm; (b) h=103 μm; (c) h=90 μm; (d) h=77 μm; (e) h=64 μm
Fig. 6. Relative density and cross-section images of NiTi bulk samples fabricated with selected laser melting under different hatch spacing values
Fig. 7. XRD spectra of Ni50Ti50 powder and NiTi bulk samples fabricated with selected laser melting under different hatch spacing values
Fig. 8. Phase transformation behavior of Ni50Ti50 powder and NiTi bulk samples fabricated with selected laser melting under different hatch spacing values. (a) DSC curves; (b) change trend of phase transition temperature with hatch spacing
Fig. 9. Mechanical properties of NiTi bulk samples fabricated with selected laser melting under different hatch spacing values. (a) Compressive stress-strain curves; (b) tensile stress-strain curves
Fig. 10. Superelasticity of NiTi bulk samples fabricated with selected laser melting under hatch spacing of 77 μm. (a) Cyclic compressive stress-strain curves; (b) effect of cycle numbers on recoverable strain and irrecoverable strain
Fig. 11. Comparison of mechanical properties between our work and reported NiTi in recent years. (a) Compression performance; (b) tensile properties
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Table 1. Forming parameters of NiTi bulk samples
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