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Effect of cooling conditions after rolling on microstructure and properties of a low-carbon bainitic steel |
ZOU Hang1,2, LIU Man1, XU Guang1 |
1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 2. Research and Development Center, Baoshan Iron and Steel Co., Ltd., Wuhan 430080, Hubei, China |
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Abstract In order to investigate the effect of different cooling conditions after rolling on microstructure and mechanical properties of a high-strength low-carbon bainitic steel,the dilatometry,field emission SEM,TEM and tensile tests were utilized to clarify the microstructural evolution and property changes of a high-strength low-carbon bainitic steel under different cooling conditions. The results show that,with a final cooling temperature of 510 ℃ and 450 ℃ in the bainite transformation area,the microstructure mainly composed of GB and BF respectively,and more island like martensite was found in the former condition. Moreover,GB and BF microstructure were refined and the portion of island like martensite was reduced as the cooling rate increased. At different cooling conditions,a lower final cooling temperature always led to a higher phase transformation speed,and the highest phase transformation speed acquired at the condition of a cooling rate of 50 ℃/s. With a higher final cooling temperature,better plasticity and smaller strength variation acquired. On the contrary contrast,superior strength acquired,but lower plasticity and remarkably strength fluctuation.
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Received: 23 February 2021
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[1] Caballero F G,Bhadeshia H K D H,Mawella K J A,et al. Very strong low temperature bainite[J]. Materials Science and Technology,2002,18:279. [2] Caballero F G,Bhadeshia H K D H. Very strong bainite[J]. Current Opinion in Solid State and Materials Science,2004,8:251. [3] Garcia-Mateo C,Caballero F G,Bhadeshia H K D H. Mechanical properties of low-temperature bainite[J]. Materials Science Forum,2005,500:495. [4] HU H J,XU G,LIU F,et al. Dynamic observation of twin evolution during austenite grain growth in an Fe-C-Mn-Si alloy[J]. International Journal of Materials Research,2014,105:337. [5] ZHOU M X,XU G,WANG L,et al. Combined effect of the prior deformation and applied stress on the bainite transformation[J]. Metals and Materials International,2016,22:956. [6] ZHANG X X,XU G,WANG X,et al. Mechanical behavior of carbide-free medium carbon bainitic steels[J]. Metallurgical and Materials Transactions A,2014,45:1352. [7] ZHANG M,WANG Y H,ZHENG C L,et al. Effects of ausforming on isothermal bainite transformation behavior and microstructural refinement in medium-carbon Si-Al-rich alloy steel[J]. Materials and Design,2014,62:168. [8] ZHOU M X,XU G,HU H J,et al. Comprehensive analysis on the effects of different stress states on the bainitic transformation[J]. Materials Science and Engineering A,2017,704:427. [9] 刘曼,胡海江,田俊羽,等. 贝氏体钢等温淬火和淬火-配分复合工艺[J]. 钢铁,2021,56(1):69.(LIU Man,HU Hai-jiang,TIAN Jun-yu,et al. Integrated austempering and quenching-partitioning process of a bainitic steel[J]. Iron and Steel,2021,56(1):6.) [10] 周松波,胡锋,尹朝朝,等. 块状组织细化对贝氏体钢断裂行为的影响[J]. 钢铁,2020,55(11):103.(ZHOU Song-bo,HU Feng,YIN Zhao-zhao,et al. Effect of refinement of bulk structure on fracture behavior of bainitic steel[J]. Iron and Steel,2020,55(11):103.) [11] 姚耔杉,胡海江,田俊羽,等. 铬和铝元素对低碳贝氏体钢组织和性能影响[J]. 钢铁,2020,55(12):66.(YAO Zi-shan,HU Hai-jiang, TIAN Jun-yu,et al. Effect of Cr and Al on microstructure and properties of low carbon bainitic steels[J]. Iron and Steel,2020,55(12):66.) [12] 陈光辉,徐光,胡海江,等. 1.6 GPa级中碳高强贝氏体钢残余奥氏体调控机理[J]. 钢铁,2021,56(2):110.(CHEN Guang-hui,XU Guang, HU Hai-jiang,et al. Controlling mechanism of retained austenite in a 1.6 GPa grade medium-carbon high-strength bainitic steel[J]. Iron and Steel,2021,56(2):110.) [13] ZHOU M X,XU G,ZHANG Y L. The effects of external compressive stress on the kinetics of low temperature bainitic transformation and microstructure in a superbainite steel[J]. International Journal of Materials Research,2015,106:1040. [14] Bhadeshia H K D H. A thermodynamic analysis of isothermal transformation diagrams[J]. Metal Science,1982,16:159. [15] Bhadeshia H K D H. Bainite in Steels[M]. London:Institute of Materials,1992. |
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