On the nature of high-strength state of carbon steel produced by severe plastic deformation

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Ganeev, Artur V.^1 ; Karavaeva, Marina V.^1 ; Sauvage, Xavier^2 ; Courtois-Manara, Eglantine^3 ; Ivanisenko, Yulia^3 ; Valiev, Ruslan Z.^1,4

Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, K. Marx 12, Ufa 450000, Russia^1

Groupe de Physique des Matériaux, Faculté des Sciences, CNRS UMR 6634, BP12, 76801 Saint-Etienne du Rouvray, France^2

Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany^3

Saint Petersburg State University, Universitetskaya nab. 7-9, St. Petersburg, 199034, Russia^4

关键词: 3d atom probe tomographies;    Grain boundary strengthening;    Hall Petch relationship;    Precipitate strengthening;    Relative contribution;    Severe plastic deformations;    Strengthening mechanisms;    Ultra fine grained microstructure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012128/pdf
DOI  :  10.1088/1757-899X/63/1/012128

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Contributions of different strengthening mechanisms to yield strength of carbon steels C 10 (0.1 % C) and C 45 (0.45 % C) with ultrafine-grained microstructures have been analyzed in this work based on the precision investigation of the microstructure by electron microscopy, 3D atom probe tomography, and mechanical properties. Estimated values of yield stress showed satisfactory agreement with the experimental results. It is shown that significant contribution to strengthening is made by carbides. In particular, as the carbon content increases in carbon steels, the volume fraction of cementite increases and, accordingly, there is a bigger deviation of the yield strength value from the classical Hall-Petch relationship. The relative contribution of grain boundary strengthening into the yield stress is reduced due to an increased proportion of precipitate strengthening.