A thermodynamic model on predicting density of medium-Mn steels with experimental verification

作     者：Guo-hui Shen Peng-yu Wen Hal-wen Luo 

作者机构：School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China 

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

年 卷 期：2017年第24卷第11期

页      面：1078-1084页

核心收录：

学科分类：08[工学] 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：financial support from the Natural Science Foundation of China and BaoSteel Group Co.,Ltd.(Grant No.U1460203) the International Science&Technology Cooperation Program of China(Grant No.2015DFG51950) the Fundamental Research Funds for the Central Universities 

主　　题：Density Medium Mn steel Retained austenite fraction Volume expansion Transformation 

摘      要：A new model on predicting the density of hot-rolled multi-phased medium-Mn steel has been presen ted on the basis of thermodynamic calculations. This is an integrated model, which includes one for calculating the retained austenite （RA） fraction and the other for volume expansion during the aus tenite-to martensite transformation, because both of them are key parameters for calculating the den- sity of steel at ambient temperature. The existing empirical equations for calculating Mx temperature and lattice constants of both martensite and austenite have been all rcassessed by the XRD measure ments on the microstructures of seven hot-rolled medium-Mn steels. Finally, the densities ot seven steels were calculated merely from compositions and compared with the measured ones. The differ ence between them is no more than 1 %, suggesting that the presented model should be of good value in designing the low density steels.