Abstract
The fracture behaviour and morphologies of high-strength boron steel were investigated at different temperatures at a constant strain rate of 0.1 s-1 based on isothermal tensile tests. Fracture mechanisms were also analyzed based on the relationship between microstructure transformation and continuous cooling transformation (CCT) curves. It is found that 1) fractures of the investigated steel at high temperatures are dimple fractures; 2) the deformation of high-strength boron steel at high temperatures accelerates diffusion transformations; thus, to obtain full martensite, a higher cooling rate is needed; and 3) the investigated steel has the best plasticity when the deformation temperature is 750 °C.
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Foundation item: Project(51305317) supported by the National Natural Science Foundation of China; Projects(WUT: 2013-IV-092, WUT: 2014-VII-002) supported by the Fundamental Research Funds for the Central Universities, China; Project(IRT13087) supported by Innovative Research Team Development Program of Ministry of Education of China
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Liu, Jn., Song, Yl., Lu, J. et al. Effect laws and mechanisms of different temperatures on isothermal tensile fracture morphologies of high-strength boron steel. J. Cent. South Univ. 22, 1191–1202 (2015). https://doi.org/10.1007/s11771-015-2633-4
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DOI: https://doi.org/10.1007/s11771-015-2633-4