几种常用的铸造高温合金在燃烧天然气的锅炉里于700—850℃之间进行了长达一万三千小时的高温腐蚀试验。结果指出:K18合金发生严重的肿胀开裂;K3与K19合金则在表面上形成一些小凸包;其余的合金受腐蚀程度则较轻微。它们的抗蚀性能优劣顺序如下:FSX414,M38,537,K17G,K3,K19,K18。对产生的腐蚀现象与过程进行了详细地讨论,并且指出,合金表面氧化层中富Cr,Ti,Al层的存在是它具有良好的抗高温腐蚀能力的一个重要因素。
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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