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| HIGH TEMPERATURE OXIDATION OF SEVERAL Ni-Cr-Al LOW SEGREGATION SUPERXLLOYS |
| HU Wushing; LI Tiefan; SHEN Jianian (State Key Laborutory Of Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015) |
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Abstract Three kinds of Ni-Cr-Al alloys with different amountB of Cr, Al, Co, Ti etc. and trace elements of S and Zr were oxidized isothermally and cyclicly at 1000～1100℃. For the alloy with relatively high amount of Cr(16 wt%) and low amounts of Al(3.5 wt%) and S(≤0.005 wt%), the oxide scale formed after oxidation at steady state stage consisted of a continuous and compact protective Cr2O3 outer layer and dendritic shape Al2O3 internal oxidation zone. The scale adherence demonstrated by cyclic oxidation was fairly good. For the alloy with relatively high amount of Al(5 Wt%) and low amounts of Cr(9 wt%) and S(≤0.005 wt%), the oxide scale consisted mainly of Al2O3,TiO2, Cr2O3 and spinels and the scale adherence was rather poor, but addition of S(0.1 wt%) and Zr(0.1 wt%) into this alloy improved the scale adherence. Small amount of S(≤0.005 Wt%) had no obviously adverse effects on the adherence of Cr2O3 scale. The simultaneous additions of relatively high amounts of S(0.1 Wt%) and Zr(0.1 Wt%) increased the oxidation rate of Al2O3 forming Ni-Cr-Al alloy. The addition of small of Zr(0.1 wt%) could minimize the negative effects of S on the adherence of AlO3 scale.
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Received: 25 August 1996
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Cite this article:
HU Wushing; LI Tiefan; SHEN Jianian (State Key Laborutory Of Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015). HIGH TEMPERATURE OXIDATION OF SEVERAL Ni-Cr-Al LOW SEGREGATION SUPERXLLOYS. J Chin Soc Corr Pro, 1996, 16(4): 293-297.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I4/293
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