水蒸气温度对700℃先进超超临界锅炉候选合金GH2984氧化行为的影响

doi:10.11868/j.issn.1001-4381.2015.000305

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摘要采用X射线衍射仪、扫描电子显微镜对比研究GH2984合金在750℃和850℃纯水蒸气中的氧化行为。结果表明：GH2984合金的氧化动力学遵循抛物线规律；温度升高，Cr挥发加速，外氧化和内氧化的速率急剧增加，氧化膜的组成结构发生明显的变化。750℃时，合金表面形成单层致密的（Cr，Mn）₂O₃膜；温度升至850℃，氧化膜中空洞的数量大幅增加，氧化膜转变为由薄的外层Fe₂TiO₅和厚的次外层（Cr，Mn）₂O₃及薄的内层（Nb，Mo）₂O₅组成的三层结构。Ti，Al优先于晶界处发生内氧化，分别形成TiO₂和Al₂O₃；两种内氧化产物的尺寸和数量均随温度升高而增加。

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	杨珍
	鲁金涛
	张夏妮
	赵新宝
	袁勇
	党莹樱
	尹宏飞
	谷月峰

关键词 ： GH2984高温合金, 先进超超临界燃煤电站, 水蒸气, 高温氧化

Abstract：The oxidation behavior of GH2984 alloy in pure steam at 750℃ and 850℃ was investigated by using X-ray diffractometer (XRD) and scanning electron microscope equipped with energy dispersive spectra (SEM/EDS). Results show that GH2984 alloy is oxidized parabolically with time. The temperature rising greatly promotes the external and internal oxidation and also the evaporation of Cr. The composition and microstructure of the oxide films change obviously. At 750℃, a compact and single-layered (Cr,Mn)₂O₃ film is formed on alloy surface; the number of voids in oxide scale increases at 850℃, whereas a three-layered oxide scale consisting of thin Fe₂TiO₅ outer layer and much thicker (Cr,Mn)₂O₃ middle layer and thinner (Nb,Mo)₂O₅ inner layer is formed at the elevated temperature. Ti and Al are internally oxidized preferentially along grain boundaries to be TiO₂ and Al₂O₃, respectively; both the number and the size of the two internal oxides increase with the temperature rising.

Key words： GH2984 superalloy advanced ultra-supercritical coal-fired power plant steam high temperature oxidation

收稿日期: 2015-03-18 出版日期: 2018-01-18

中图分类号:

TG132.3

通讯作者: 杨珍(1985-),女,博士,高级工程师,研究方向:金属的高温氧化,联系地址:陕西省西安市碑林区兴庆路136号西安热工研究院有限公司(710032),E-mail:janeyoungscience@gmail.com E-mail: janeyoungscience@gmail.com

引用本文:

杨珍, 鲁金涛, 张夏妮, 赵新宝, 袁勇, 党莹樱, 尹宏飞, 谷月峰. 水蒸气温度对700℃先进超超临界锅炉候选合金GH2984氧化行为的影响[J]. 材料工程, 2018, 46(1): 74-82.
YANG Zhen, LU Jin-tao, ZHANG Xia-ni, ZHAO Xin-bao, YUAN Yong, DANG Ying-ying, YIN Hong-fei, GU Yue-feng. Effect of Steam Temperature on Oxidation Behavior of GH2984 Alloy as a Candidate for 700℃ Advanced Ultra-supercritical Boilers. Journal of Materials Engineering, 2018, 46(1): 74-82.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000305 或 http://jme.biam.ac.cn/CN/Y2018/V46/I1/74

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