<strong>Nb</strong>对<strong>Fe22Cr5Al3Mo</strong>合金显微组织和耐腐蚀性能的影响

doi:10.11900/0412.1961.2019.00276

金属学报

2020, Vol. 56

Issue (3): 321-332 DOI: 10.11900/0412.1961.2019.00276

研究论文

本期目录 | 过刊浏览

Nb对Fe22Cr5Al3Mo合金显微组织和耐腐蚀性能的影响

钱月¹,孙蓉蓉¹,张文怀¹,姚美意¹(

),张金龙¹,周邦新¹,仇云龙²,杨健³,成国光⁴,董建新⁵

1. 上海大学材料研究所上海 200072
2. 中兴能源装备有限公司海门 226126
3. 上海大学材料科学与工程学院省部共建高品质特殊钢冶金与制备国家重点实验室上海 200444
4. 北京科技大学钢铁冶金新技术国家重点实验室北京 100083
5. 北京科技大学材料科学与工程学院北京 100083

Effect of Nb on Microstructure and Corrosion Resistance of Fe22Cr5Al3Mo Alloy

QIAN Yue¹,SUN Rongrong¹,ZHANG Wenhuai¹,YAO Meiyi¹(

),ZHANG Jinlong¹,ZHOU Bangxin¹,QIU Yunlong²,YANG Jian³,CHENG Guoguang⁴,DONG Jianxin⁵

1. Institute of Materials, Shanghai University, Shanghai 200072, China
2. Zhongxing Energy Equipment Co. , Ltd. , Haimen 226126, China
3. State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
4. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
5. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

钱月,孙蓉蓉,张文怀,姚美意,张金龙,周邦新,仇云龙,杨健,成国光,董建新. Nb对Fe22Cr5Al3Mo合金显微组织和耐腐蚀性能的影响[J]. 金属学报, 2020, 56(3): 321-332.
Yue QIAN, Rongrong SUN, Wenhuai ZHANG, Meiyi YAO, Jinlong ZHANG, Bangxin ZHOU, Yunlong QIU, Jian YANG, Guoguang CHENG, Jianxin DONG. Effect of Nb on Microstructure and Corrosion Resistance of Fe22Cr5Al3Mo Alloy[J]. Acta Metall Sin, 2020, 56(3): 321-332.

全文: PDF(30332 KB) HTML

摘要:

采用静态高压釜腐蚀实验研究了添加不同含量的Nb (0.5%、1.0%、2.0%，质量分数) 对Fe22Cr5Al3Mo合金在500 ℃、10.3 MPa过热蒸汽中耐腐蚀性能的影响；采用EBSD、TEM、EDS、SEM等手段研究了合金的显微组织及腐蚀不同时间后的氧化膜显微组织。结果表明，添加Nb的合金中析出了Nb(C, N)、Fe₂(Nb, Mo)和Cr₂(Nb, Mo)第二相，细化了合金晶粒；当Nb≥1.0%时，随着Nb含量的增加，合金的耐腐蚀性能得到进一步改善。合金氧化膜从外向内依次是Fe、Cr、Al的氧化物；含1.0%Nb的合金不同氧化物的界面比不含Nb合金的更清晰，由不同成分氧化物引起的分层现象更明显；含1.0%Nb合金的氧化膜厚度比不含Nb合金的更均匀；在金属和氧化膜界面处，不含Nb合金中的Al氧化膜呈不连续分布，在基体和Cr氧化层中都发现了Al氧化物颗粒，说明不含Nb合金发生了Al的内氧化现象；而1.0%Nb合金中的Al氧化膜呈连续均匀分布，说明添加Nb能够抑制Al的内氧化，促进均匀且致密的Al氧化膜的形成，从而降低合金的氧化速率。

关键词 ： Fe-Cr-Al合金, Nb, 显微组织, 腐蚀, 氧化膜

Abstract：

Fe-Cr-Al alloy is a promising candidate accident tolerant fuel (ATF) cladding material. It is helpful to developing Fe-Cr-Al alloy with excellent corrosion resistance by investigating the effect of chemical composition on its corrosion behavior under the normal condition of simulated nuclear reactor operation. In this work, the effect of Nb content (0.5%, 1.0%, 2.0%, mass fraction) on the corrosion resistance of Fe22Cr5Al3Mo alloys in 500 ℃ and 10.3 MPa superheated steam was investigated by static autoclave tests. The microstructures of the alloys and oxide films formed on the alloys after different exposure time were observed and analyzed by EBSD, TEM, EDS and SEM. The results showed that the second phase particles (SPPs) of Nb(C, N), Fe₂(Nb, Mo) and Cr₂(Nb, Mo) were precipitated and the grains were finer in the Nb-containing alloys. The corrosion resistance of the alloys was further improved with the increase of Nb content (in the case of Nb≥1.0%). The oxides of Fe, Cr and Al were formed separately in the oxide layer from outside to inside. Compared with the Nb-free alloy, the interfaces of different oxides were clearer and had a more obvious stratification resulting from the oxides with different composition appeared in the oxide film on the alloy with 1.0%Nb. The thickness of oxide film on the alloy with 1.0%Nb was more uniform than that on the alloy without Nb. At the oxide film and metal matrix interface, the alumina layer on the Nb-free alloy was dispersive, and the alumina particles were detected in both the matrix and chromium oxide scale, which illustrated the internal oxidation of aluminum occurred. While the alumina layer on the alloy with 1.0%Nb was more uniform and continuous. This indicated that the addition of Nb inhibited the internal oxidation of aluminum, and promoted the formation of uniform and continuous alumina layer, therefore reduced the oxidation rate of the alloy.

Key words： Fe-Cr-Al alloy Nb microstructure corrosion oxide film

收稿日期: 2019-08-19

ZTFLH:

TG142.1

基金资助:国家自然科学基金项目(51871141)

作者简介: 钱月，女，1992年生，硕士生

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	钱月
	孙蓉蓉
	张文怀
	姚美意
	张金龙
	周邦新
	仇云龙
	杨健
	成国光
	董建新
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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00276 或 https://www.ams.org.cn/CN/Y2020/V56/I3/321

表1 Fe22Cr5Al3Mo-xNb合金的成分 (mass fraction / %)

图1 Fe22Cr5Al3Mo-xNb合金的XRD谱

图2 Fe22Cr5Al3Mo-xNb合金晶粒晶界的EBSD像

表2 Fe22Cr5Al3Mo-xNb合金的XRD特征峰参数(θ，d)和晶格常数平均值(ā)

图3 Fe22Cr5Al3Mo-xNb合金中典型第二相粒子的TEM明场像、SAED花样和EDS结果

表3 Fe22Cr5Al3Mo-xNb合金中几种典型第二相尺寸统计 (nm)

图4 Fe22Cr5Al3Mo-xNb合金在500 ℃、10.3 MPa过热蒸汽中的腐蚀增重曲线和腐蚀增重与Nb含量的关系

图5 0Nb和1.0Nb合金在500 ℃、10.3 MPa过热蒸汽中腐蚀不同时间氧化膜外表面SEM像

图6 0Nb和1.0Nb合金在500 ℃、10.3 MPa过热蒸汽中腐蚀不同时间后氧化膜横截面的HAADF像(图6b中三角位置是氧化膜局部破裂区域)

图7 0Nb合金在500 ℃、10.3 MPa过热蒸汽中腐蚀3 h的氧化膜横截面显微组织和成分分析结果

图8 1.0Nb合金在500 ℃、10.3 MPa过热蒸汽中腐蚀3 h的氧化膜横截面显微组织和成分分析结果

图9 0Nb合金在500 ℃、10.3 MPa过热蒸汽中腐蚀500 h的氧化膜横截面显微组织和成分分析结果

图10 1.0Nb合金在500 ℃、10.3 MPa过热蒸汽中腐蚀500 h的氧化膜横截面显微组织和成分分析结果

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