Microstructure and mechanical behavior of a low-density Fe-12Mn- 9Al-1.2C steel prepared using centrifugal casting under near-rapid solidification

作     者：Wei He Bi-lei Wang Yang Yang Yun-hu Zhang Lian Duan Zhi-ping Luo Chang-jiang Song Qi-jie Zhai 

作者机构：State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and Engineering Shanghai UniversityShanghai 200444 China Department of Chemistry and Physics Fayetteville State University Fayetteville NC 28301 USA 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2018年第25卷第8期

页      面：830-838页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Acknowledgements This work was financially supported by the Joint Fund of Iron and Steel Research (No. U1660103) and National Natural Science Foundation of China (No. 51574162). TEM tests were conducted in the Instrumental Analysis and Research Center at Shanghai University. The authors would like to express sincere thanks for the staff support at the Center 

主　　题：Low-density steel Near-net shape Mechanical property Microstructure Near-rapid solidification 

摘      要：It is vital for emission reduction and energy saving to lighten the weight of automobile. Low-density Fe-Mn-Al-C steels with high strength and excellent ductility have become a promising type of material in the automotive industry. Thus, a new approach was proposed by using centrifugal casting to produce the low-density Fe-12Mn-9Al-1.2C steel with high performance under near-rapid solidification in a near-net shape. The produced steel strips, with a thickness of 2.5 mm and a density of 6.89 g/cm3, were examined for their microstructures and mechanical properties. The results showed that mechanical properties of as-cast steel strip reached 1182 MPa in ultimate tensile strength and 28.1% in total elongation. Aging treatment at 400 or 600℃ for 3 h enhanced tensile strength of the steel strips, while aging at 800℃ dramatically decreased its elongation. Moreover, Young＇ s modulus of the steel strip improved with the increment of aging temperature. The relationship between the mechanical properties and the microstructures was discussed. The results demonstrated that advanced low-density steels with promising mechanical properties could be directly produced from liquid by this simple process.