The stability of Cr3C2/Ni3Al Composite at elevated temperature

Acta Metall Sin

2007, Vol. 43

Issue (4): 439-443 DOI:

Research Articles

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The stability of Cr3C2/Ni3Al Composite at elevated temperature

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钢铁研究总院高温所

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. The stability of Cr3C2/Ni3Al Composite at elevated temperature. Acta Metall Sin, 2007, 43(4): 439-443 .

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Abstract The phase stability and chemical stability of Cr3C2/Ni3Al composite at 1000℃ have been investigated through long-term aging and oxidation experiment. After long-term aging at 1000℃，chromium carbides kept stable, a few gamma phases separated out and strengthened the Ni3Al matrix, which resulted in the harness of Cr3C2/Ni3Al composite increase. On the other hand, Cr3C2/Ni3Al composite possessed good oxidation resistance. The protective oxides that mainly consisted of α-Al2O3 were formed and the chromium carbides exhibited good anti-oxidation stability and oxidation synergism with Ni3Al matrix. The analyse shows that the chromium carbides are dissolved during welding and some dissolved Cr enter into Ni3Al matrix. The existence of Cr promotesα-Al2O3 formation, which improves the oxidation resistance of the composite obviously. The oxidation rate of the Ni3Al alloy is two times greater than that of the composite in air. Good phase stability and chemical stability make Cr3C2/Ni3Al composite be suitable for long-term service at 1000℃.

Key words: Ni3Al chromium carbide composite stability at elevated temperature

Received: 20 June 2006

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