用坩埚熔盐腐蚀方法研究了不同碳含量的IN-738合金的热腐蚀行为。并用金相、X-线衍射分析、电子探针、扫描电镜等方法对试验后样品的腐蚀表面进行了观察研究。结果表明:碳能明显地改善IN-738合金的热腐蚀抗力,特别是在800℃附近这种效果最为突出。当合金中碳含量低于0.1％时,随着合金中碳量的增加,合金的热腐蚀失重明显地减少,碳含量在0.1～0.2％之间,其改善作用逐渐减弱,当碳含量超过0.2％时进一步增碳,就几乎不再起什么作用了。初步讨论了试验结果,认为碳能阻碍碱性融蚀并促进富铬的氧化膜形成,是其有益作用的主要原因。
The effect of carbon on hot corrosion behavior of IN-738 was studied with the fused-salt crucible method. Surfaces of corroded specimens have been examined by means of metallography, X-ray diffraction analysis, EPMA, SEM, etc. It was shown that carbon greatly improved the hot-corrosion resistance of IN-738, especially at about 800℃. When the carbon content was below 0.1％, improvement was most remarkable, between 0.1-0.2％, the effect decreased gradually, and beyond 0.2％, it had no further effect. Two possibilities are suggested to account for the beneficial effect of carbon: retardation of basic fluxing corrosion and promotion of formation of a Cr-rich protective oxide film.
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