Study on Stability of Mechanical Properties for Porous Fe-Cr-Al Alloys after Long-Term Aging

被引：9
作者：
Zhang, Huibin [1 ]
Ma, Junliang [1 ]
Gao, Zhencheng [1 ]
Guo, Fei [1 ]
Xu, Shenghang [1 ]
Hou, Guangya [1 ]
Zheng, Guoqu [1 ]
机构：
[1] Zhejiang Univ Technol, Coll Mat Sci & Engn, Hangzhou 310014, Peoples R China
来源：
MATERIALS | 2022年 / 15卷 / 10期
基金：
中国国家自然科学基金;
关键词：
FeCrAl; porous material; aging treatment; grain-boundary engineering; oxidation; HIGH-TEMPERATURE FILTRATION; MICROSTRUCTURAL STABILITY; OXIDATION BEHAVIOR; REACTIVE SYNTHESIS; STAINLESS-STEEL; FECRAL ALLOYS; EMBRITTLEMENT; ALPHA'; MODEL; INTERMETALLICS;
D O I：
10.3390/ma15103718
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Nowadays, both the ferrite phase and B2-structured intermetallic in the Fe-Cr-Al alloy system are developed as porous materials, which have been further applied as high-temperature filter materials in industry. This work presents a comparative study of the mechanical properties of porous Fe20Cr5Al, Fe10Cr10Al and Fe10Cr20Al aged at 480 degrees C for 500 h. The changes in tensile strength, elongation and hardness were determined, and the microstructure changes as well as slight oxidation states of the aged samples were investigated. The results show that the precipitated Cr-rich phase in porous Fe20Cr5Al can increase the hardness and decrease the ductility, while intergranular oxidation can degrade the mechanical performance of the three porous Fe-Cr-Al materials. It is noted that porous Fe10Cr20Al exhibits relatively superior mechanical stability during long-term aging. Meanwhile, by introducing boron, the mechanical performance of the aged porous Fe-Cr-Al alloys can be stabilized since the possible internal oxidation of the exposed grain boundaries is inhibited.
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页数：13
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