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加氧處理對(duì)700℃級(jí)超超臨界鍋爐合金GH2984飽和蒸汽氧化行為的影響
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1.西安工業(yè)大學(xué);2.西安熱工研究院有限公司

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國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Oxygenated treatment on Saturated Vapour Oxidation Behaviors of GH2984 Alloys for 700 °C Ultra-supercritical Boilers
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1.Xi’an Technological University,Xi’an;2.Xi’an Thermal Power Research Institute Co Ltd,Xi’an

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    摘要:

    采用氧化增重法、X射線衍射、掃描電子顯微鏡研究了不同溶解氧濃度下700℃級(jí)超超臨界鍋爐用GH2984鎳基合金的750℃飽和蒸汽氧化行為,結(jié)果表明： GH2984合金在不同溶解氧濃度(10ppb、5ppm)的水蒸氣中生成的氧化層均為單層結(jié)構(gòu),主要由連續(xù)Cr2O3和少量彌散或局部聚集分布著Al2O3、TiO2內(nèi)氧化產(chǎn)物組成。加氧處理會(huì)造成GH2984合金氧化膜厚度增加和內(nèi)氧化現(xiàn)象明顯,并使得表面零散分布的Fe2O3瘤狀凸起消失,轉(zhuǎn)而生成更多富Cr瘤狀凸起。另外,水中溶解氧濃度上升未引起GH2984合金表面Cr2O3氧化膜的加速揮發(fā),但降低了氧化膜中的TiO2含量。

    Abstract:

    The saturated vapor oxidation behaviors of GH2984 alloys at 750 °C were investigated by oxidation weight increasing method, X-ray diffraction and scanning electronic microscopy in different dissolved oxygen concentrations. The results showed that the oxide film of GH2984 alloys in different dissolved oxygen concentrations was of a single layer consisting of continuous Cr2O3 and disperse or local clustered internal oxidation products of Al2O3 and TiO2. The oxidation weight gain of GH2984 alloys slightly increased with increment of the dissolved oxygen concentrations in water vapor. Oxygenated treatment could accelerate the internal oxidation phenomenon, enhance the oxidation film thickness and make the scattered nodular bulges of Fe2O3 disappear and more Cr-rich nodular bulges form. Moreover, high dissolved oxygen concentrations did not affect the stabilization of Cr2O3 but decrease TiO2 content in the oxide film.

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王毓,劉江南,王正品,要玉宏,史志剛,張紅軍.加氧處理對(duì)700℃級(jí)超超臨界鍋爐合金GH2984飽和蒸汽氧化行為的影響[J].稀有金屬材料與工程,2018,47(12):3672~3677.[Wang Yu, Liu Jiangnan, Wang Zhengpin, Yao Yuhong, Shi Zhigang, Zhang Hongjun. Oxygenated treatment on Saturated Vapour Oxidation Behaviors of GH2984 Alloys for 700 °C Ultra-supercritical Boilers[J]. Rare Metal Materials and Engineering,2018,47(12):3672~3677.]
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  • 收稿日期:2017-12-27
  • 最后修改日期:2018-09-29
  • 錄用日期:2018-10-08
  • 在線發(fā)布日期: 2019-01-04
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