Effects of Pulse Current on the Microstructure and Properties of Directionally Solidified TiAl Based Alloy in Cold Crucible

doi:10.11901/1005.3093.2021.496

Chinese Journal of Materials Research

2022, Vol. 36

Issue (9): 706-714 DOI: 10.11901/1005.3093.2021.496

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Effects of Pulse Current on the Microstructure and Properties of Directionally Solidified TiAl Based Alloy in Cold Crucible

WANG Guotian¹(

), LONG Zekun², WU Biao¹, WANG Qiang¹, DING Hongsheng²

^1.School of Automobil and Traffic Engineering, Heilongjiang Institute of Technology, Harbin 150050, China
^2.National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Cite this article:

WANG Guotian, LONG Zekun, WU Biao, WANG Qiang, DING Hongsheng. Effects of Pulse Current on the Microstructure and Properties of Directionally Solidified TiAl Based Alloy in Cold Crucible. Chinese Journal of Materials Research, 2022, 36(9): 706-714.

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Abstract

Referring to the simulation results, the effects of pulse current with different parameters on the solidification structure and properties of directionally solidified Ti-45.5Al-4Cr-2.5Nb (%, atom fraction) alloy were investigated. The results show that when the pulse current frequency is 200 Hz, due to the skin effect of current and Joule heat effect of current the surface current of melt is biased and the lateral heat dissipation decreases, the average deviation angle of dendrite decreases, and the elongation increases with the decrease of deviation angle. When the density of pulse current is small, the average width of grains decreases with the increase of current density due to Joule heat effect of current and electromagnetic stirring which promote the remelting or breaking of dendrites. However, when the current density reaches a certain value, the melting zone grows up and the temperature gradient decreases. On the contrary, the average width of grains increases and the tensile strength of TiAl alloy first increases with the increase of current density, and then decreases; Compared with the master alloy ingot, the tensile strength and elongation of TiAl alloy increased by 70.7% and 129.5% respectively.

Key words: metallic materials pluse current TiAl alloy directional solidification microstructure mechanical property

Received: 31 August 2021

ZTFLH:

TG244.3

Fund: Doctor Foundation Project of Heilongjiang Institute of Technology(2019BJ03);Basic Scientific Research Business Fee (Innovation Team Category) Project of Heilongjiang Institute of Technology(2020CX02);Basic Scientific Research Business Fee (Innovation Team Category) Project of Heilongjiang Institute of Technology(2018CX07);Provincial Leading Talent Echelon Cultivation Program(2020LJ04);Heilongjiang Natural Science Foundation(LH2019E114)

About author: WANG Guotian, Tel: 13836023153, E-mail: guotianw@139.com

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.496 OR https://www.cjmr.org/EN/Y2022/V36/I9/706

Fig.1 Schematic diagram of loading pulse current in continuous solidification process

Fig.2 Temperature field distribution of TiAl based alloy during solidification under different pulse current (a) 0 mA/mm²; (b) 17.6 mA/mm²; (c) 35.3 mA/mm²; (d) 52.9 mA/mm²

Table 1 Radial temperature difference of melt under different pulse current

Fig.3 Radial temperature distribution of TiAl based alloy under different pulse current

Fig.4 Longitudinal section macrostructures of 45.5Al-4Cr-2.5Nb alloy with different pulse current (a) 0 mA/mm²; (b) 17.6 mA/mm²; (c) 35.3 mA/mm²; (d) 52.9 mA/mm²

Fig.5 Average deviation angle of grains with different pulse current

Table 2 Average deviation angle of grains with different pulse current

Fig.6 OM images of directional solidified TiAl with different pulse current (a) 0 mA/mm²; (b) 17.6 mA/mm²; (c) 35.3 mA/mm²; (d) 52.9 mA/mm²

Fig.7 XRD spectra of directional solidification region of TiAl alloys at different current intensities

Table 3 Average grain width of samples with different pulse current

Fig.8 Effect of different pulse current on lamellar orientation of TiAl based alloy (a) 0 mA/mm²; (b) 17.6 mA/mm²; (c) 35.3 mA/mm²; (d) 52.9 mA/mm²

Fig.9 Proportion of lamellar area with lamellar angle less than 45° with different pulse current

Fig.10 SEM images of directionally solidified TiAl at current intensities (a) 0 mA/mm²; (b) 17.6 mA/mm²; (c) 35.3 mA/mm²; (d) 52.9 mA/mm²

Table 4 EDS analysis of TiAl based alloy with different pulse current

Fig.11 Tensile curves of TiAl based alloy with different pulse current

Table 5 Ttensile properties of TiAl based alloy under different pulse current

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