EBSD characterization of deformed lath martensite in IF steel

38th Risø International Symposium on Materials Science

Lv, Z.^1,2 ; Zhang, X.^2 ; Huang, X.^2 ; Hansen, N.^2

Key Laboratory of Advanced Forging and Stamping Technology and Science, Ministry of Education of China, Yanshan University, Qinhuangdao

066004, China^1

Section for Materials Science and Advanced Characterization, Department of Wind Energy, Technical University of Denmark, Riso Campus, Roskilde

DK-4000, Denmark^2

关键词: Electron backscatter diffraction analysis;    Lath martensite structures;    Misorientation angle;    Rolling deformation;    Strain hardening rate;    Structural transitions;    Structure characteristic;    Thickness reduction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/219/1/012033/pdf
DOI  :  10.1088/1757-899X/219/1/012033

来源: IOP

【 摘 要 】

Rolling deformation results in the transformation of a lath martensite structure to a lamellar structure characteristic to that of IF steel cold-rolled to medium and high strains. The structural transition takes place from low to medium strain, and electron backscatter diffraction analysis shows that the frequency of medium angle boundaries with misorientation angles of 5-10° decreases with increasing strain, while the frequencies of boundaries with angles in the ranges of 1-5° and 10-25° increase, resulting in the evolution of a bimodal misorientation angle distribution. The microstructural evolution and the strength are characterized for lath martensite rolled to a thickness reduction of 30%, showing that large changes in the misorientation take place, while the strain hardening rate is low.