Effect of Mn and V on Hot Corrosion of TiAl Alloy

Acta Metall Sin

2004, Vol. 40

Issue (2): 179-184 DOI:

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Effect of Mn and V on Hot Corrosion of TiAl Alloy

JIN Guangxi; QIAO Lijie; GAO Kewei; KIMURA Takashi; HASHIMOTO Kenki$

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JIN Guangxi; QIAO Lijie; GAO Kewei; KIMURA Takashi; HASHIMOTO Kenki$. Effect of Mn and V on Hot Corrosion of TiAl Alloy. Acta Metall Sin, 2004, 40(2): 179-184 .

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Abstract The effect of Mn and V on hot corrosion of TiAl in (Na, K)2SO4 melt at 900 ℃ has been investigated. The results show that there is a little effect of Mn on hot-corrosion resistance and the scale structure of TiAl alloy. TiAl and TiAl-Mn alloys have a low hot-corrosion rate because the outer layer of the scale is mainly protective Al2O3. Adding V, however, could change the structure of the scale, and then increased hot corrosion rate of the TiAl and TiAl-Mn alloys by one order of magnitude. For TiAl-V and TiAl-Mn-V alloys, the scale is mainly TiO2, and minor Al2O3 and V2O5. V2O5 can induce cyclic acidic dissolution of Al2O3. As a result, the scale of the TiAl-V and TiAl-Mn-V alloys peeled off locally at the early stage of hot corrosion, and the alloys have a large hot-corrosion rate.

Key words: TiAl intermetallic compound hot corrosion Mn V

Received: 10 April 2003

ZTFLH:	TG146.2
	TG172.62

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	JIN Guangxi
	QIAO Lijie
	GAO Kewei
	KIMURA Takashi
	HASHIMOTO Kenki$

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I2/179

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