ENHANCING THE CRYOGENIC IMPACT TOUGHNESS OF FERRITIC STEEL BY MULTI-TYPE AND FINE-MICROSTRUCTURE DESIGN
Keywords:
Ferritic steel; thermo-mechanical control process; ferrite grain morphology, cryogenic impact toughness
Abstract
Based on pure melting, multi-type and fine-microstructure design, a ferritic steel with an outstanding combination of cryogenic impact toughness and strength was fabricated. The microstructure was characterized by means of optical microscopy, electron back-scattered diffraction and transmission electron microscopy. The steels with different final cooling temperatures of 663 °C and 560 °C show ferrite and perlite microstructure, and ferrite grain size can be refined from 3.15 µm to 2.67 µm by lowering the final cooling temperature from 663 °C to 560 °C. Moreover, a higher volume fraction of acicular ferrite and polygonal ferrite can be obtained for a lower final cooling temperature of 560 °C. Hence, the cryogenic impact toughness can be enhanced, and the brittle failure can be suppressed, even at –110 °C, showing a higher impact toughness compared with other ferritic steels.
References
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4. J. Reiser, A. Hartmaier, Elucidating the dual role of grain boundaries as dislocation sources and obstacles and its impact on toughness and brittle-to-ductile transition, Sci. Rep, 10 (2020), 1–18, doi:10.1038/ s41598-020-59405-5
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6. R. Song, D. Ponge, D. Raabe, Mechanical properties of an ultrafine grained C-Mn steel processed by warm deformation and annealing, Acta Mater, 53 (2005), 4881–4892, doi:10.1016/j.actamat.2005. 07.009
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9. J. W. Morris Jr, Stronger tougher steels, Science, 320 (2008), 1022–1023, doi:10.1126/science.1158994
10. M. Zhang, Q. Yu, Z. Liu, J. Zhang, RO. Ritchie, 3D printed Mg-NiTi interpenetrating-phase composites with high strength, damping capacity, and energy absorption efficiency, Sci Adv, 6 (2020), 1–9, doi:10.1126/sciadv.aba5581
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12. H. Kong, C. Xu, C. Bu, C. Da, J. Luan, Z. Jiao, G. Chen, C. Liu, Hardening mechanisms and impact toughening of a high-strength steel containing low Ni and Cu additions, Acta Mater, 172 (2019), 150–160, doi:10.1016/j.actamat.2019.04.041
13. M. Jeong, T. Park, S. Choi, S. Lee, J. Han, Recovering the ductility of medium-Mn steel by restoring the original microstructure, Scr Mater, 190 (2021), 16–21, doi:10.1016/j.scriptamat.2020.08.022
14. H. Tervoa, A. Kaijalainena, T. Pikkarainen, S. Mehtonen, D. Porter, Effect of impurity level and inclusions on the ductility and toughness of an ultra-high-strength steel, Mate. Sci. Eng. A, 697 (2017), 184–193, doi:10.1016/j.msea.2017.05.013
15. W. Bielefeldt, A. Vilela, Study of inclusions in high sulfur, al-killed ca-treated steel via experiments and thermodynamic calculations, Steel Res Int, 86 (2015), 375–385, doi:10.1002/srin.201400112
16. Gupta, S. Goyal, K. Padmanabhan, A. Singh, Inclusions in steel: micro–macro modelling approach to analyse the effects of inclusions on the properties of steel, Int. J. Adv. Manuf. Tech, 77 (2015), 565–572, doi:10.1007/s00170-014-6464-5
17. Zaitsev, A. Koldaev, N. Arutyunyan, S. Dunaev, D. D’yakonov, Effect of the chemical composition on the structural state and mechanical properties of complex microalloyed steels of the ferritic class, Processes, 8 (2020), 646–657, doi:10.3390/pr8060646
18. C. Wang, M. Wang, J. Shi, W. Hui, H. Dong, Effect of micro¬structural refinement on the toughness of low carbon martensitic steel, Scr. Mater, 58 (2008), 492–495, doi:10.1016/j.scriptamat.2007. 10.053
19. K. Andrews. Empirical formulae for calculation of some transformation temperatures, J I S I, 203 (1965), 721–727
20. B. Hwang, C. Lee, S. Kim, Low-temperature toughening mechanism in thermo-mechanically processed high-strength low-alloy steels, Metal Mater Trans A, 42 (2011), 717–728, doi:10.1007/s11661-¬010-¬0448-3
Published
2023-03-30
How to Cite
1.
LiuZ- cheng, Gao P, RenJ- kuan, LiC- gang, ZhongW- bo, Hu Z, LiuZ- yu. ENHANCING THE CRYOGENIC IMPACT TOUGHNESS OF FERRITIC STEEL BY MULTI-TYPE AND FINE-MICROSTRUCTURE DESIGN. MatTech [Internet]. 2023Mar.30 [cited 2026Aug.10];57(2):191–199. Available from: https://mater-tehnol.si/index.php/MatTech/article/view/840
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