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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 hot corrosion behavior of IN-738 alloy with different carbon content was investigated by molten salt corrosion of crucible. The corrosion surface of the sample after the test was observed by metallography, X-ray diffraction analysis, electron probe, scanning electron microscopy and other methods. The results show that carbon can obviously improve the hot corrosion resistance of IN-738 alloy, especially at 800 ℃. When the content of carbon in the alloy is less than 0.1%, the weight loss of hot corrosion of the alloy decreases obviously with the increase of the amount of carbon in the alloy. The carbon content is between 0.1-0.2%, and the improvement is weakened gradually. When the carbon content exceeds 0.2 % Further carbon, almost no longer play a role. Preliminary discussion of the test results, that carbon can hinder the alkaline corrosion and promote chromium-rich oxide film formation is the main reason for its beneficial effects.