The effect of isothermal aging on creep behavior of modified 2.5Al alumina-forming austenitic steel

被引：33
作者：
Jiang, Jundong [1 ,2 ]
Liu, Ziyun [1 ,2 ]
Gao, Qiuzhi [1 ,2 ]
Zhang, Hailian [3 ]
Hao, Aimin [1 ,2 ]
Qu, Fu [1 ,2 ]
Lin, Xiaoping [1 ,2 ]
Li, Huijun [4 ]
机构：
[1] Northeastern Univ Qinhuangdao, Sch Resources & Mat, Qinhuangdao 066004, Hebei, Peoples R China
[2] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China
[3] Daotian High Technol Co Ltd, Qinhuangdao 066004, Hebei, Peoples R China
[4] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300354, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 797卷
基金：
中国国家自然科学基金;
关键词：
AFA steel; Isothermal aging; Creep behavior; Strengthening mechanism; FERRITIC STAINLESS-STEEL; MECHANICAL-PROPERTIES; STRENGTHENING MECHANISMS; PRECIPITATION BEHAVIOR; OXIDATION RESISTANCE; CARBIDE DISSOLUTION; PHASE PRECIPITATION; LAVES PHASE; MICROSTRUCTURE; DEFORMATION;
D O I：
10.1016/j.msea.2020.140219
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructural evolution and creep behavior of aged 2.5Al alumina-forming austenitic (AFA) steel were investigated by scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The average particle size, volume fraction of precipitates and dislocation density were statistically measured to evaluate the contribution of precipitation strengthening and dislocation strengthening to the creep strength. The results suggested that the phase boundaries between Laves and B2-NiAl were incoherent interface, and both B2-NiAl and Laves were main strengthened phases in aged 2.5Al-AFA steel. The creep results indicated that the sample aged for 1000 h exhibited creep capability with the smallest creep strain and steady-state creep rate. The isothermal aging treatment can be considered as an effective way to improve the creep strength of 2.5Al-AFA steel.
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页数：11
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