Study on the key role of hierarchical microstructure for strength and plasticity in a lath martensitic steel

2017 5th International Conference on Mechanical Engineering, Materials Science and Civil Engineering

机械制造;材料科学;土木建筑工程

Yang, Ming^1,2 ; Long, Shao-Lei^2 ; Liang, Yi-Long^2

Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming

650093, China^1

College of Materials and Metallurgy, Guizhou University, Guiyang

550025, China^2

关键词: Angle orientation;    Hierarchical microstructures;    Lath martensitic steels;    Linear relationships;    Martensite laths;    Prior austenite grains;    Quenching temperatures;    Strength and plasticities;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/324/1/012043/pdf
DOI  :  10.1088/1757-899X/324/1/012043

来源: IOP

【 摘 要 】

In this paper, the effect of substructure of lath martensite on the mechanical properties was discussed in detail. Results indicated that prior austenite grain, packet and block increase with the increasing of quenching temperature. A good linear relationship exists between the packet, block and prior austenite, which reveal that the size of packet, block depends on prior austenite grain. However, lath is increased with not determined by prior austenite grain. Based on the EBSD analysis, the large ratio of the low angle orientation boundaries determines the better plasticity is obtained in coarse grain. Therefore, the refining of martensite lath or the increase of the low angle orientation plays an important role on improving the plasticity in lath martensite steel.