Effects of electropulsing on the microstructure and microhardness of a selective laser melted Ti6Al4V alloy
| Autor: | J.L. Yi, L.X. Meng, J. Chen, J.B. Gao, H.B. Ji, L. Wang, P. Li, Zhefeng Zhang, D.D. Ben, D.L. Lian, Huajie Yang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering Alloy Metals and Alloys 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Indentation hardness 0104 chemical sciences Mechanics of Materials Transmission electron microscopy Materials Chemistry Hardening (metallurgy) engineering Dislocation Composite material 0210 nano-technology Electron backscatter diffraction |
| Zdroj: | Journal of Alloys and Compounds. 875:160044 |
| ISSN: | 0925-8388 |
| Popis: | Optimizing the microstructure and mechanical properties of the selective laser melted (SLM) Ti6Al4V alloy is an important issue both in the scientific and engineering interests. In this study, the rapid hardening and softening of the SLM-Ti6Al4V alloy is realized due to the obvious evolution of microstructures during the electropulsing treatment (EPT) with different discharge voltages. The microhardness of the EPT-7.5 kV sample decreased about 7% while the EPT-8 kV sample increased about 10% compared with the as-received sample. Scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) analysis were used to characterize the evolutions of α and β grains and dislocation structures which are corresponding with the microhardness changes induced by EPT. Analysis shows that EPT could reduce the thermodynamic barrier for α → β solid-state phase transformation, further arise microstructure refinement in the SLM-Ti6Al4V alloy. This research shed some new light on rapidly and efficiently improving the microstructure and mechanical properties of the additive manufactured metal components. |
| Databáze: | OpenAIRE |
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