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Microstructure and high-temperature tensile property of TiAl alloy produced by selective electron beam melting by Hang-Yu Yue; Hui Peng; Yong-Jun Su; Xiao-Peng Wang; Yu-Yong Chen is a Engineering article available to read on EtoBox.

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The microstructure and high-temperature tensile property of a Ti-47Al-2Cr-2Nb alloy fabricated via selective electron beam melting (SEBM) with hatch spacings of 85, 100, and 115 lm were systematically investigated. When the hatch spacing increased from 85 to 115 lm, the microstructure comprising the horizontal cross section changed from coarse lamellar (c/B2) colonies to an inhomogeneous structure and the grain morphology transformed from elongated grains to inhomogeneous and equiaxed grains along the building direction of the vertical cross section. The boundary population of the SEBMproduced TiAl alloy samples was dominated by high-angle grain boundaries (C 15°), and the volume fraction of these boundaries decreased with hatch spacing increasing. Additionally, the as-built TiAl alloy sample produced under a spacing of 100 lm exhibited the highest room-and elevated-temperature tensile strengths, with the ultimate tensile strength at room temperature (642 MPa) increasing to 674 MPa at 700 °C. Furthermore, the mechanism of anomalous strengthening at 700 °C was discussed in detail.

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Author

Hang-Yu Yue; Hui Peng; Yong-Jun Su; Xiao-Peng Wang; Yu-Yong Chen

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Field

Engineering (Physical Sciences)