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工程科学学报,第37卷,第5期:595599,2015年5月 Chinese Journal of Engineering,Vol.37,No.5:595-599,May 2015 DOI:10.13374/j.issn2095-9389.2015.05.009:http://journals.ustb.edu.cn 钛微合金化热轧双相钢的工艺研究 衣海龙四,徐薇,龙雷周,刘振宇,王国栋 东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819 ☒通信作者,Email:yihl@ral.neu.cdn.cn 摘要通过模拟实验研究了钛微合金化热轧双相钢的连续冷却转变曲线及终轧温度对组织的影响规律,获得了可行的工 艺窗口,并进行了验证性热轧实验.在冷却速率小于5℃·s及温度在625~725℃时,实验钢可以形成先共析铁素体.随着 终轧温度升高,组织中铁素体及马氏体含量先升高后降低,但幅度不大.同时,当终轧温度较高时,铁素体显微硬度增加,析 出强化作用增加.当终轧温度及缓冷温度分别为840℃及700℃时,获得了抗拉强度为672MP及屈强比为0.61的性能良好 的热轧双相钢.经计算,铁素体组织中析出强化量为78.5MP 关键词双相钢:热轧:钛微合金化:材料加工:力学性能 分类号TG142.1 Investigation on processing for a titanium-microalloyed hot rolled dual phase steel YI Hai-ong,XU Wei,LONG Lei-zhou,LIU Zhen-yu,WANG Guo-dong The State Key Laboratory of Rolling and Automation,Northeastemn University,Shenyang 110819,China Corresponding author,E-mail:yihl@ral.neu.edu.cn ABSTRACT Continuous cooling transformation curves were established and the influence of finish rolling temperature on the micro- structure was investigated for a titanium-microalloyed dual phase steel through simulation experiment.A feasible process based on sim- ulation experiment was obtained and confirmatory experiment was performed.It was found that pro-eutectoid ferrite could form in the steel when the cooling rate was less than 5C's at a temperature of 625 to 725 C.The amount of ferrite and martensite increased firstly and then decreased slightly with the increasing of finishing rolling temperature.A higher hardness of ferrite was obtained at a higher finish rolling temperature because of precipitation strengthening.Better performance with a tensile strength of 672 MPa and a yield ratio of 0.61 was obtained for the steel when the finish rolling and slow cooling temperatures were 840C and 700C,respective- ly.The amount of this precipitation strengthening was about 78.5 MPa based on calculations. KEY WORDS dual phase steel:hot rolling:titanium microalloyed:materials processing:mechanical properties 从现代汽车的设计、制造、使用及市场需求来看, 能钢材的使用需求,国内外学者开展了纳米析出强化 车体轻量化、节能环保及制造低成本化不断推动着现 钢及TRP钢等先进高强钢的研究工作B.针对热轧 代汽车行业的技术进步.为了节约能源及提高安全性双相(dual phase,DP)钢来说,由于其具有优异的成形 能,高性能钢材在汽车车身的应用比例越来越高。一 性能、高均匀应变量和高断裂应变量,因此在汽车工业 方面,高性能钢材可有效实现汽车轻量化,降低油耗, 和其他机械行业领域具有广泛的应用.从成分设计来 有效减少二氧化碳等废气的排放量;另一方面,为了提 看,为了获得铁素体/马氏体或铁素体/贝氏体双相组 高车辆自身的抗冲撞安全性,必须使用高性能钢材来 织,其成分中大多添加了Si、P、C、Mo等合金元素.为 提高车体强度.为了应对汽车行业对低成本高性 了进一步提高性能,又添加了一定量的N、V及T微 收稿日期:201401-30 基金项目:国家自然科学基金资助项目(51104046):中央高校基本科研业务费资助项目(N120407001,N120807001)工程科学学报,第 37 卷,第 5 期: 595--599,2015 年 5 月 Chinese Journal of Engineering,Vol. 37,No. 5: 595--599,May 2015 DOI: 10. 13374 /j. issn2095--9389. 2015. 05. 009; http: / /journals. ustb. edu. cn 钛微合金化热轧双相钢的工艺研究 衣海龙,徐 薇,龙雷周,刘振宇,王国栋 东北大学轧制技术及连轧自动化国家重点实验室,沈阳 110819  通信作者,E-mail: yihl@ ral. neu. edu. cn 摘 要 通过模拟实验研究了钛微合金化热轧双相钢的连续冷却转变曲线及终轧温度对组织的影响规律,获得了可行的工 艺窗口,并进行了验证性热轧实验. 在冷却速率小于 5 ℃·s - 1及温度在 625 ~ 725 ℃ 时,实验钢可以形成先共析铁素体. 随着 终轧温度升高,组织中铁素体及马氏体含量先升高后降低,但幅度不大. 同时,当终轧温度较高时,铁素体显微硬度增加,析 出强化作用增加. 当终轧温度及缓冷温度分别为 840 ℃及 700 ℃时,获得了抗拉强度为 672 MPa 及屈强比为 0. 61 的性能良好 的热轧双相钢. 经计算,铁素体组织中析出强化量为 78. 5 MPa. 关键词 双相钢; 热轧; 钛微合金化; 材料加工; 力学性能 分类号 TG142. 1 Investigation on processing for a titanium-microalloyed hot rolled dual phase steel YI Hai-long ,XU Wei,LONG Lei-zhou,LIU Zhen-yu,WANG Guo-dong The State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China  Corresponding author,E-mail: yihl@ ral. neu. edu. cn ABSTRACT Continuous cooling transformation curves were established and the influence of finish rolling temperature on the micro￾structure was investigated for a titanium-microalloyed dual phase steel through simulation experiment. A feasible process based on sim￾ulation experiment was obtained and confirmatory experiment was performed. It was found that pro-eutectoid ferrite could form in the steel when the cooling rate was less than 5 ℃·s - 1 at a temperature of 625 to 725 ℃ . The amount of ferrite and martensite increased firstly and then decreased slightly with the increasing of finishing rolling temperature. A higher hardness of ferrite was obtained at a higher finish rolling temperature because of precipitation strengthening. Better performance with a tensile strength of 672 MPa and a yield ratio of 0. 61 was obtained for the steel when the finish rolling and slow cooling temperatures were 840 ℃ and 700 ℃,respective￾ly. The amount of this precipitation strengthening was about 78. 5 MPa based on calculations. KEY WORDS dual phase steel; hot rolling; titanium microalloyed; materials processing; mechanical properties 收稿日期: 2014--01--30 基金项目: 国家自然科学基金资助项目( 51104046) ; 中央高校基本科研业务费资助项目( N120407001,N120807001) 从现代汽车的设计、制造、使用及市场需求来看, 车体轻量化、节能环保及制造低成本化不断推动着现 代汽车行业的技术进步. 为了节约能源及提高安全性 能,高性能钢材在汽车车身的应用比例越来越高. 一 方面,高性能钢材可有效实现汽车轻量化,降低油耗, 有效减少二氧化碳等废气的排放量; 另一方面,为了提 高车辆自身的抗冲撞安全性,必须使用高性能钢材来 提高车体强度[1--2]. 为了应对汽车行业对低成本高性 能钢材的使用需求,国内外学者开展了纳米析出强化 钢及 TRIP 钢等先进高强钢的研究工作[3--5]. 针对热轧 双相( dual phase,DP) 钢来说,由于其具有优异的成形 性能、高均匀应变量和高断裂应变量,因此在汽车工业 和其他机械行业领域具有广泛的应用. 从成分设计来 看,为了获得铁素体/马氏体或铁素体/贝氏体双相组 织,其成分中大多添加了 Si、P、Cr、Mo 等合金元素. 为 了进一步提高性能,又添加了一定量的 Nb、V 及 Ti 微
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