Abstract: Effect of different precursor microstructure on retained austenite and mechanical properties of a Cu bearing low-carbon steel was studied by means of scanning electron microscopy (SEM),electron microprobe analysis (EPMA) and X-ray diffraction (XRD). The results showed that austenite nucleation and growth were controlled by C partition in initial stages and Mn, Cu partition in the later stages of intercritical annealing. The effect of Mn, Cu enrichment formed in the intercritical partitioning was retained after austenitizing. The rigion could form retained austenite easily in the quenching and C partitioning stages subsequent. After I&Q&P heat treatment, the steel with ferrite + pearlite (P+F) precursor could obtain the coarser martensite lath, but the original austenite grain boundary was not obvious. The steel with ferrite + martensite (P+M) precursor could obtain the orderd martensite lath and the lath was fine; While the martensite (M) precursor steel could obtain a microstructure of more refined martensite lath. After I&Q&P heat treatment, the steel with M precursor had the most volume fraction of retained austenite. The elongation of this kind of steel was up to 24.1%, and thus the product of strength and elongation was 25 338 MPa·%, the mechanical properties was the best.
陈连生, 曹鸿梓, 田亚强, 宋进英, 魏英立, 郑小平. 前驱体对含Cu低碳钢I&Q&P处理后组织性能的影响[J]. 《材料导报》期刊社, 2017, 31(6): 105-109.
CHEN Liansheng, CAO Hongzi, TIAN Yaqiang, SONG Jinying, WEI Yingli, ZHENG Xiaoping. Influence of Precursor on Microstructure and Mechanical Property of a Cu Bearing Low-carbon Steel by I&Q&P Treatment. Materials Reports, 2017, 31(6): 105-109.
1 Kang Yonglin. Light weight vehicle, advanced high strength steel and energy-saving and emission reduction[J]. Iron Steel,2008,43(6):1(in Chinese). 康永林. 汽车轻量化先进高强钢与节能减排[J]. 钢铁,2008,43(6):1. 2 Jiang Haitao, Tang Di, Mi Zhenli. Latest progress in development and application of advanced high strength steels for automobiles[J]. J Iron Steel Res,2007,19(8):1(in Chinese). 江海涛, 唐荻, 米振莉. 汽车用先进高强度钢的开发及应用进展[J]. 钢铁研究学报,2007,19(8):1. 3 Lei Xiaowei, Gao Wanfu, Feng Yaorong, et al. Influence of quen-ching-partitioning-tempering process on microstructure and properties of 20SiMn2MoV steel[J]. Trans Mater Heat Treatment,2013,34(11):138(in Chinese). 雷晓维, 高万夫, 冯耀荣, 等. Q-P-T 工艺对20SiMn2MoV钢组织与性能的影响[J]. 材料热处理学报,2013,34(11):138. 4 Ren Yongqiang, Xie Zhenjia, Shang Chengjia. Regulation of retained austenite and its effect on the mechanical properties of low carbon steel[J]. Acta Metall Sin,2012,48(9):1074(in Chinese). 任勇强, 谢振家, 尚成嘉. 低碳钢中残余奥氏体的调控及对力学性能的影响[J]. 金属学报,2012,48(9):1074. 5 Ren Yongqiang, Xie Zhenjia, Shang Chengjia. Microstructure regulation and mechanical properties of low-carbon multiphase steels[J].J University of Science and Technology Beijing,2013(5):592(in Chinese). 任勇强, 谢振家, 尚成嘉. 低碳多相钢的组织调控与力学性能[J]. 北京科技大学学报, 2013(5):592. 6 Chen Liansheng, Zhang Jianyang, Tian Yaqiang, et al. Effect of Mn pre-partitioning on C partitioning and retained austenite of Q&P steels[J]. Acta Metall Sin,2015(5):527(in Chinese). 陈连生, 张健杨, 田亚强, 等. 预先Mn配分处理对Q&P钢中C配分及残余奥氏体的影响[J].金属学报,2015(5):527 7 Tian Yaqiang, Zhang Hongjun, Chen Liansheng, et al. Effect of alloy elements partitioning behavior on retained austenite and mechanical property in low carbon high strength steel[J]. Acta Metall Sin,2014(5):531(in Chinese). 田亚强, 张宏军, 陈连生, 等. 低碳高强钢合金元素配分行为对残余奥氏体和力学性能的影响[J].金属学报,2014(5):531. 8 Jing Cainian, Wang Zuocheng. The action of alloy element in transformation-induced plasticity steels[J]. Mater Rev,2004,18(11):36(in Chinese). 景财年, 王作成. 合金元素在相变诱发塑性钢中的作用[J]. 材料导报,2004,18(11):36. 9 Yang Caifu, Liu Yizhi, Chai Feng, et al. Strength and toughness of austenite decomposition products in high strength Cu-bearing steel during continuous cooling[J].J University of Science and Technology Beijing,2014,36(4):438(in Chinese). 杨才福, 刘翊之, 柴锋, 等. 高强度含铜钢奥氏体连续冷却转变产物的强韧性[J]. 北京科技大学学报,2014,36(4):438. 10 Ouyang Huangsheng, Pan Tao, Su Hang, et al. Effect of copper on strength and cryogenic toughness of 9Ni steel[J]. Chin J Mater Res,2012,26(3):215(in Chinese). 欧阳凰生, 潘涛, 苏航, 等. Cu对9Ni钢强度和低温韧性的影响[J]. 材料研究学报,2012,26(3):215. 11 Liu Qingdong. Atom probe tomography study on copper precipitaion strengthening and reverse austenite toughening in HSLA ferritic steel[D]. Shanghai: Shanghai University,2012(in Chinese). 刘庆冬. HSLA铁素体钢中Cu析出强化和奥氏体韧化的原子探针层析技术研究[D]. 上海:上海大学,2012. 12 Tadashi Kasuya, Takahiro Izawa, Tomoyuki Kakeshita. Hydrogen evolution of Cu precipitation 780 MPa grade steel HAZ with conside-ration of its cold cracking susceptibility[J]. Welding World,2014,11:113 13 Bagliani E P, Santofimia M J, Zhao L, et al. Microstructure, tensile and toughness properties after quenching and partitioning treatments of a medium-carbon steel[J]. Mater Sci Eng A,2013,559(3):486. 14 Santofimia M J, Nguyen-Minh T, Zhao L, et al. New low carbon Q&P steels containing film-like intercritical ferrite[J]. Mater Sci Eng A,2010,527(23):6429.
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2017, Vol. 31 
