Microstructure Evolution and Mechanical Properties of Ferrite-Austenite Duplex Fe-Mn-Al-(Cu)-C Steel under Different Annealing Temperatures

被引：4
作者：
Yan, Xiang [1 ]
Wu, Yiming [1 ]
Zhang, Minghe [1 ]
Liu, Songsong [1 ]
Sun, Lihui [1 ]
Feng, Yunli [1 ]
机构：
[1] North China Univ Sci & Technol, Coll Met & Energy, Tangshan 063210, Peoples R China
来源：
MATERIALS | 2022年 / 15卷 / 22期
基金：
中国国家自然科学基金;
关键词：
medium Mn steels; intercritical annealing; microstructure; mechanical properties; TRANSFORMATION-INDUCED PLASTICITY; MEDIUM-MN STEEL; TENSILE PROPERTIES; BEHAVIOR; NANOINDENTATION; STABILITY; STRENGTH; MARTENSITE; KINETICS; CARBON;
D O I：
10.3390/ma15228271
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：
The effect of Cu addition and the intercritical annealing (IA) temperature on the microstructural evolution and mechanical properties of Fe-0.4C-7Mn-4Al (wt%) was investigated via scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and nanoindentation tests. The results showed that the volume fraction and the average grain size of austenite, and the fraction of high angle grain boundaries, increased with IA temperature increase in the range of 650 degrees C to 710 degrees C. The addition of Cu facilitates the formation of Cu-rich nanoparticles, raises the volume fraction of austenite, and delays the recrystallization of austenite. As IA temperature increased, the yield strength (YS), ultimate tensile strength (UTS), and Luders bands strain (LBS) decreased in both experimental steels. The Cu addition not only increases the YS of medium Mn steel but also benefits the decrease of LBS. The best comprehensive mechanical properties were obtained at the IA temperature of 690 degrees C in the studied steel, with Cu addition. According to nanoindentation experiments, the Cu addition raises the hardness of ferrite and austenite from 4.7 GPa to 6.3 GPa and 7.4 GPa to 8.5 GPa, respectively, contributing to the increase of YS of medium-Mn steel.
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页数：14
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