1 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050; 2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou 730050
Abstract: The 1 200 MPa cold-rolled dual phase steel was designed and manufactured by adopting C-Si-Mn-Cr-Nb and C-Si-Mn-Nb system in laboratory, and its thermoplastic properties were studied. The results showed that after cold rolling, the test steel exhibited the tensile strength of 1 205 MPa and 1 235 MPa, the yield strength of 545 MPa and 530 MPa, the yield ratio of 0.45 and 0.43, and the elongation of 11.5% and 10.5%, respectively. Besides, the C-Si-Mn-Cr-Nb based test steel presented superior mechanical properties to that of C-Si-Mn-Nb based test steel. Moreover, the thermoplastic properties of the test steel were studied by means of thermal simulator. For the two kind of 1 200 MPa cold-rolling dual phase steel under experimental conditions, it can be found that there existⅠ brittle zone and Ⅲ brittle zone in the C-Si-Mn-Nb based test steel, while there exists only Ⅲ brittle zone in C-Si-Mn-Cr-Nb based test steel. Both of the test steels show low thermoplastic property in the range of 600-1 100 ℃ and reach a minimum at 750 ℃, which results from the precipitation of Nb(C, N) and AlN along the austenite grain boundary.
1 Ma Mingtu,Yi Hongliang. Application of high strength steel to manufacturing auto[J]. Heat Treatment,2011(6):9(in Chinese). 马鸣图,易红亮.高强度钢在汽车制造中的应用[J].热处理,2011(6):9. 2 Farivar H,Richter S,Hans M,et al. Experimental quantification of carbon gradients in martensite and its multi-scale effects in a DP steel[J]. Materials Science and Engineering: A,2018,718(7):250. 3 Liu Dahai,Meng Weijin,Meng Junpeng. Deformation behavior and constitutive model of DP780 high strength steel at high strain rates [J]. Journal of Plasticity Engineering,2018,25(1):161(in Chinese). 刘大海,孟维金,蒙骏鹏.DP780高强钢板材高应变率变形行为及本构模型[J].塑性工程学报,2018,25(1):161. 4 Qing Jiasheng,Shen Houfa. Production process and properties of DP800 dual phase steel[J]. Iron Steel Vanadium Titanium, 2017, 37(2):138(in Chinese). 卿家胜,沈厚发.冷轧双相钢DP800生产工艺及性能研究[J].钢铁钒钛,2017,37(2):138. 5 Tian Chengda,Li Dayong,Peng Yinghong. Research on the dynamic deformation behavior of the DP780 advanced high strength steel[J]. Journal of Plasticity Engineering,2008,15(6):102(in Chinese). 田成达,李大永,彭颖红.DP780高强钢板动态变形力学行为研究[J].塑性工程学报,2008,15(6):102. 6 Al-Abbasi F M. Predicting the effect of ultrafine ferrite on the deformation behavior of DP-steels[J]. Computational Materials Science,2016,119:90. 7 Schwindt C D, Stout M, Iurman L,et al. Forming limit curve determination of a DP-780 steel sheet [J]. Procedia Materials Science,2015,8:978. 8 Ramazani A, Schwedt A, Aretz A,et al. Characterization and mo-delling of failure initiation in DP steel[J]. Computational Materials Science,2013,75:35. 9 Sun X,Choi K S, Soulami A,et al.On key factors influencing ductile fractures of dual phase (DP) steels[J]. Materials Science and Engineering: A,2009,526(1-2):140. 10 Depover T,Wallaert E,Verbeken K. Fractographic analysis of the role of hydrogen diffusion on the hydrogen embrittlement susceptibi-lity of DP steel[J]. Materials Science and Engineering: A,2016,649(1):201. 11 Ramazani A,Mukherjee K,Prahl U, et al. Modelling the effect of microstructural banding on the flow curve behaviour of dual-phase (DP) steels[J]. Computational Materials Science,2012,52(1):46. 12 Wang Zhigang,Zhao Zhengzhi,Zhao Aimin,et al. Effect of participation on microstructures,mechanical properties and texture of deep drawing DP steel[J]. Materials Science and Technology,2013,21(5):75(in Chinese). 汪志刚,赵征志,赵爱民,等.析出相对深冲DP钢组织性能及织构的影响[J].材料科学与工艺,2013,21(5):75. 13 Kong Zheng,Kong Ning,Zhang Jie, et al. Mechanical property of dual phase steel and its effect on the forming limit[J]. Journal of Mechanical Engineering,2017,38(4):140(in Chinese). 孔政,孔宁,张杰,等.双相钢的力学性能和对成形极限的影响[J].机械工程学报,2017,38(4):140. 14 Wang Hui, Liu Wenyan, Yuan Guilian, et al. Effect of experimental conditions on hot ductility of dual phase steel and its mechanism analysis[J]. Journal of Iron and Steel Research,2008,12(15):16(in Chinese). 王辉,刘文艳,袁桂莲,等.不同实验条件对冷轧双相钢高温热塑性的影响及影响机制[J].钢铁研究学报,2008,12(15):16. 15 Ni Youjin,Zhao Jing,Sun Yanhui,et al. Study on hot ductility of SS400 steel thin slab[J]. Continuous Casting, 2008,10(15):16(in Chinese). 倪有金,赵晶,孙彦辉,等.SS400钢薄板坯高温塑性研究[J].连铸,2008,10(15):16. 16 Luo Diqiang,Xie Feiming,Wang Zhigang,et al. Hot ductility beha-vior of high-quality 51CrV4 spring steel[J]. Materials Review B: Research Papers,2016,30(6):90(in Chinese). 罗迪强,谢飞鸣,汪志刚,等.高品质弹簧钢51CrV4的高温塑性研究[J].材料导报:研究篇,2016,30(6):90. 17 Dai Qifeng,Song Renbo,Guan Xiaoxia,et al. Effects of ferrite grain size on dynamic deformation behavior of ferrite-Martensite dual phase steel DP980[J]. Journal of Mechanical Engineering,2012,48(6):44(in Chinese). 代启锋,宋仁伯,关小霞,等.铁素体晶粒尺寸对铁素体—马氏体双相钢DP980动态变形行为影响[J].机械工程学报,2012,48(6):44.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2018, Vol. 32 
