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| CORROSION DAMAGE OF SOME CAST SUPERALLOYS EXPOSED TO BURNING NATURAL GAS IN BOILER CHAMBER |
| Man Yongfa and Liu Jiale (Institute of Metal Research; Academia Sinica) and Xu Yongyan (Shanghai Steam Turbine Manufactory) |
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Cite this article:
Man Yongfa and Liu Jiale (Institute of Metal Research; Academia Sinica) and Xu Yongyan (Shanghai Steam Turbine Manufactory). CORROSION DAMAGE OF SOME CAST SUPERALLOYS EXPOSED TO BURNING NATURAL GAS IN BOILER CHAMBER. Acta Metall Sin, 1981, 17(6): 607-702.
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Abstract With the object of examining the high temperature corrosion damage of seven conventional cast superalloys, the experiments were made of the exposure of representative specimens to burning natural gas in the steam boiler combustion chamber under temperature between 700—850℃ for a long-term up to 13000h. The following observations with specimens have been done: macro-and micro-metallography, weight changes, X-ray diffraction analysis, EPMA, glow discharge emission spectroscopy, etc. The alloy K18 was corroded seriously to swell and to crack; K3 and K19 appeared with some small protuberances; and the rest suffered corrosion slightly. These alloys in sequence of resistance to corrosion damage seem to be as follows: FSX414, M38, 537, K17G, K3, K19, K18. Their corrosion behaviour have also been discussed in detail. The presence of Cr,Ti,Al enriched layer in the oxidizing scale is regarded as an important factor for their resistance to high temperature corrosion.
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Received: 18 June 1981
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