...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Oxidation of Metals >Oxidation Behavior and Mechanism of Inconel 740H Alloy for Advanced Ultra-supercritical Power Plants Between 1050 and 1170 degrees C
【24h】

Oxidation Behavior and Mechanism of Inconel 740H Alloy for Advanced Ultra-supercritical Power Plants Between 1050 and 1170 degrees C

机译：Inconel 740H合金在1050至1170摄氏度之间对高级超超临界电厂的氧化行为和机理

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The oxidation behavior and mechanism of as-cast Inconel 740H superalloy, newly developed for advanced ultra-supercritical power plants superheater and reheater pipes, were investigated in the temperature range of 1050-1170 A degrees C in air. Isothermal oxidation testing, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy were used in this study. The results showed that the oxidation of Inconel 740H was a diffusion-controlled process and controlled by the outward diffusion of metallic elements and inward penetration of oxygen. Owing to the complicated chemical composition of the alloy, different oxides tended to form in the oxidation process. Cross-sectional characterization investigation indicated that the oxide-scale layer consisted of three parts when the temperature was high or the oxidation time was long: an internal oxidation zone composed of Al2O3 and TiO2, a continuous and dense middle layer of Cr2O3 containing precipitates of TiO2 and an outmost layer of NiCr2O4 spinel. In the formation process of NiCr2O4, NiO was found in the early transient stage. With further oxidation, TiO2 finally could not be detected in the internal oxidation zone as a result of outwards diffusion of Ti and its limited concentration in the matrix.
机译：研究了在先进的超超临界电厂过热器和再热器管道中新开发的Inconel 740H高温铸态合金的氧化行为和机理，在空气中温度为1050至1170 A的温度范围内进行了研究。本研究使用等温氧化测试，X射线衍射，扫描电子显微镜和能量色散X射线光谱学。结果表明，Inconel 740H的氧化是一个扩散控制的过程，受金属元素的向外扩散和氧的向内渗透的控制。由于合金的复杂化学组成，在氧化过程中倾向于形成不同的氧化物。截面特征研究表明，温度高或氧化时间长时，氧化皮层由三部分组成：由Al2O3和TiO2组成的内部氧化区，连续且致密的Cr2O3中间层（包含TiO2沉淀物） NiCr2O4尖晶石的最外层。在NiCr2O4的形成过程中，NiO在过渡早期被发现。随着进一步的氧化，由于Ti向外扩散及其在基体中的浓度有限，最终无法在内部氧化区域中检测到TiO2。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号