| REVIEW PAPER |
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| Carbide-free Bainite/Martensite Multiphase High Strength Steels:a Review |
| GAO Guhui, GUI Xiaolu, TAN Zhunli, BAI Bingzhe
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| Material Science & Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044 |
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Abstract The carbide-free bainite/martensite (CFB) multiphase high strength steels have excellent combination of strength and toughness which is superior to the martensite steels. Hence, these CFB/M multiphase steels have been used in the fields of railway, transport, machine, build, etc. The paper reviews recent works on the alloying design, heat treatment, microstructure characterization, mechanism of strengthening, toughening and ductility, delayed fracture properties, fatigue properties, of the low-cost Mn-Si-Cr series CFB/M multiphase steels. In particular, the novel CFB/M multiphase steels treated by BQ&P treatment are introduced. The results show that the BQ&P treated CFB/M multiphase steels exhibits more excellent combination of strength, ductility, toughness and fatigue properties. The paper also presents the applications of the Mn-Si-Cr series CFB/M multiphase steels, especially in the field of the heavy-haul and high-speed railway.
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Published: 08 May 2018
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2017, Vol. 31 
