电站用奥氏体耐热钢HR3C与Sanicro25在超临界水中的氧化特性

doi:10.11902/1005.4537.2019.256

中国腐蚀与防护学报

2020, Vol. 40

Issue (6): 529-538 DOI: 10.11902/1005.4537.2019.256

研究报告

本期目录 | 过刊浏览

电站用奥氏体耐热钢HR3C与Sanicro25在超临界水中的氧化特性

刘晓¹, 王海², 朱忠亮¹, 李瑞涛¹, 陈震宇¹, 方旭东³, 徐芳泓³, 张乃强¹(

)

1.华北电力大学电站设备状态监测与控制教育部重点实验室北京 102206
2.国电电力发展股份有限公司浙江分公司杭州 310020
3.太原钢铁 (集团) 有限公司先进不锈钢材料重点实验室太原 030003

Oxidation Characteristics of Austenitic Heat-resistant Steel HR3C and Sanicro25 in Supercritical Water for Power Station

LIU Xiao¹, WANG Hai², ZHU Zhongliang¹, LI Ruitao¹, CHEN Zhenyu¹, FANG Xudong³, XU Fanghong³, ZHANG Naiqiang¹(

)

1. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China
2. Guodian Power Development Co. , Ltd. Zhejiang Branch Company, Hangzhou 310020, China
3. Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel (Group) Co. , Ltd. , Taiyuan 030003, China

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摘要:

采用SEM、XRD、拉曼光谱等检测技术，对奥氏体钢HR3C与Sanicro25在650 ℃/25 MPa和700 ℃/25 MPa的超临界水中的氧化特性进行了研究。结果表明，HR3C和Sanicro25钢在超临界水中的氧化增重速率均随着温度的升高而增大，650 ℃下HR3C与Sanicro25钢的氧化时间指数分别为0.46和0.66，700 ℃下HR3C与Sanicro25钢的氧化时间指数分别为0.42和0.22；两种奥氏体钢表面形成的氧化膜均为双层结构，外层为富Fe结节状氧化物，内层为富Cr致密氧化物；温度相同时，两种奥氏体钢表面形成的氧化膜的物相组成基本相同，且均检测到Cr₂O₃的存在。此外，700 ℃时，HR3C和Sanicro25钢的外层氧化膜上均观测到了孔洞的存在。HR3C和Sanicro25钢在超临界水中的抗高温蒸汽氧化性能相近。

关键词 ：奥氏体钢, 氧化, 温度, 超临界水

Abstract：

Due to the good oxidation resistance and high creep strength, austenitic steel is widely used in the construction of supercritical power station boilers, such as boiler super-heater and re-heater tubes, and thus its oxidation resistance in supercritical water is receiving more and more attention. The oxidation characteristics of austenitic steel HR3C and Sanicro25 are studied in supercritical water at 650 ℃/25 MPa and 700°C/25 MPa for 1000 h. The surface morphology, cross-sectional morphology, element distribution and phase composition of the formed oxide scales on the steels are characterized by means of SEM, XRD and Raman spectroscopy. The results show that the formed oxide scales on HR3C and Sanicro25 in supercritical water present a double layered structure, that is to say, the outer layer is composed of Fe-rich nodular oxide, and the inner layer consists of Cr-rich dense oxide. The oxidation rate of austenitic steel HR3C and Sanicro25 in supercritical water increase significantly with the increase in temperature. The curves of oxidation mass gain vs time may be fitted with exponential functions with exponents of 0.46 and 0.66 at 650 ℃, as well as 0.42 and 0.22 at 700 ℃ for HR3C and Sanicro25 respectively. There are small differences in oxidation mass gain between the two austenitic steels. The phase composition of the oxide scales on austenitic steel HR3C and Sanicro25 is basically the same for a given temperature, while Cr₂O₃is detected. In addition, pores are observed in the outer layers on the two steels oxidized at 700 ℃, which may act as short circuit for oxygen inward diffusion. The results also show that austenitic steel HR3C and Sanicro25 have similar resistance to high temperature oxidation in supercritical water. The influence of temperature on the formation process of the oxide scales on austenitic steel HR3C and Sanicro25 and the process of the formation of nodular scales are also discussed briefly.

Key words： austenitic steel oxidation temperature supercritical water

收稿日期: 2019-12-12

ZTFLH:

TG178

基金资助:北京市科技计划(Z181100005218006);北京市自然科学基金(2194085)

通讯作者: 张乃强 E-mail: zhnq@ncepu.edu.cn

Corresponding author: ZHANG Naiqiang E-mail: zhnq@ncepu.edu.cn

作者简介: 刘晓，女，1994年生，硕士生

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引用本文:

刘晓, 王海, 朱忠亮, 李瑞涛, 陈震宇, 方旭东, 徐芳泓, 张乃强. 电站用奥氏体耐热钢HR3C与Sanicro25在超临界水中的氧化特性[J]. 中国腐蚀与防护学报, 2020, 40(6): 529-538.
Xiao LIU, Hai WANG, Zhongliang ZHU, Ruitao LI, Zhenyu CHEN, Xudong FANG, Fanghong XU, Naiqiang ZHANG. Oxidation Characteristics of Austenitic Heat-resistant Steel HR3C and Sanicro25 in Supercritical Water for Power Station. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 529-538.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.256 或 https://www.jcscp.org/CN/Y2020/V40/I6/529

表1 HR3C和Sanicro25钢的化学成分

图1 HR3C与Sanicro25钢在650和700 ℃超临界水中的氧化增重曲线

图2 HR3C钢在650和700 ℃超临界水中氧化不同时间后的表面形貌

图3 Sanicro25钢在650和700 ℃超临界水中氧化不同时间后的表面形貌

图4 HR3C钢在650和700 ℃的超临界水中氧化1000 h后标记区的EDS结果

表2 HR3C与Sanicro25钢650 ℃下形成的氧化膜组成元素含量

图5 Sanicro25钢在650和700 ℃的超临界水中氧化1000 h后标记区的EDS结果

图6 HR3C与Sanicro25钢在650和700 ℃超临界水中氧化不同时间后的形貌图

图7 HR3C与Sanicro25钢在650和700 ℃超临界水中氧化1000 h的XRD谱

图8 HR3C与Sanicro25钢在650和700 ℃超临界水中氧化1000 h后的Raman谱

图9 HR3C与Sanicro25钢在超临界水中氧化1000 h后的横截面形貌及相应的EDS结果

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