冷却工艺对Ti微合金高强钢组织和性能的影响
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摘要
采用SEM、TEM、拉伸及冲击试验等方法,对比研究了3种热轧后冷却工艺对Ti微合金高强钢板组织和性能的影响。结果表明,当轧后采用快冷+空冷工艺和空冷弛豫+层流冷工艺时,钢板组织均以粒状贝氏体组织为主,并存在少量珠光体,第二相粒子弥撒分布,尺寸小于10 nm,力学性能良好,且采用后者工艺钢板性能优于前者;当轧后采用快冷+炉冷工艺时,珠光体组织增多,第二相析出量少,尺寸大,综合力学性能较差。
Effect of three cooling processes after hot rolling on microstructure and properties of Ti-microalloyed high strength steel was investigated by means of scanning electron microscopy,transmission electron microscope,tensile and impact test. The results show that when using fast cooling + air cooling and relaxation + laminar flow cooling after finishing rolling,the steels is based on granular bainite and have a little pearlite and second phase is dispersed with size of less than 10 nm,the mechanical properties are good and the latter is better. Using fast cooling + furnace cooling after finishing rolling,the pearlite of the steel increases,the amount of the second-phase precipitation decreases and its size is bigger,so the comprehensive mechanical properties are worse.
Effect of three cooling processes after hot rolling on microstructure and properties of Ti-microalloyed high strength steel was investigated by means of scanning electron microscopy,transmission electron microscope,tensile and impact test. The results show that when using fast cooling + air cooling and relaxation + laminar flow cooling after finishing rolling,the steels is based on granular bainite and have a little pearlite and second phase is dispersed with size of less than 10 nm,the mechanical properties are good and the latter is better. Using fast cooling + furnace cooling after finishing rolling,the pearlite of the steel increases,the amount of the second-phase precipitation decreases and its size is bigger,so the comprehensive mechanical properties are worse.
引文
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[2]丁志龙.模拟轧制和冷却对Q345B钢组织和相变的影响[J].金属热处理,2013,38(8):26-28.Ding Zhilong.Effect of simulation rolling and cooling on the microstructure and phase transformation of Q345B steel[J].Heat Treatment of Metals,2013,38(8):26-28.
[3]王吉满,王远琦,刘清友,等.冷却工艺对超低碳贝氏体钢组织和性能的影响[J].金属热处理,2009,34(11):60-63.Wang Jiman,Wang Yuanqi,Liu Qingyou,et al.Effect of cooling process on microstructure and properties of untra-low-carbon bainitic steel[J].Heat Treatment of Metals,2009,34(11):60-63.
[4]蒋亮,张云鹏,陈宇红,等.粒状珠光体形成对屈氏体分级叶片耐磨性的影响[J].热加工工艺,2009,38(16):146-148.Jiang Liang,Zhang Yunpeng,Chen Yuhong,et al.Effect of formation of granular pearlite on wear resistance of troostite classifier blade[J].Hot Working Technology,2009,38(16):146-148.
[5]蓝慧芳,杜林秀,刘彦春.终冷温度对高强度工程机械用钢性能的影响[J].机械工程材料,2008,32(9):29-33.Lan Huifang,Du Linxiu,Liu Yanchun,et al.Effects of finish cooling temperature on properties of high strength engineering machinery steel[J].Materials for Mechanical Engineering,2008,32(9):29-33.
[6]焦多田,蔡庆伍,武会宾,等.空冷弛豫对X70级抗大变形管线钢组织性能的影响[J].材料热处理学报,2009,30(5):101-105.Jiao Duotian,Cai Qingwu,Wu Huibin,et al.Influence of air-cooling relaxation on microstructure and properties of X70 pipeline steel with deformation resistance[J].Transactions of Materials and Heat Treatment,2009,30(5):101-105.
[7]赵运堂,尚成嘉,贺信莱,等.低碳Mo-Cu-Nb-B系微合金钢的中温转变组织类型[J].金属学报,2006,42(1):54-58.Zhao Yuntang,Shang Chengjia,He Xinlai,et al.Intermediate transformation structures in a low carbon Mo-Cu-Nb-B microalloying steel[J].Acta Metallurgica Sinica,2006,42(1):54-58.
[8]翁宇庆,孔令航,王国栋,等.超细晶钢-钢的组织细化理论与控制技术[M].北京:冶金工业出版社,2003:312-315.
[9]Yoshimasa Funakawa,Kunikazu Tomita,Tetsuo Yamaoto.Development of high strength hot-rolled sheet steel consisting of ferrite and nanometersized carbides[J].ISIJ International,2004,44(11):1945-1951.
[10]段修刚,蔡庆武,武会宾.Ti-Mo全铁素体基微合金高强度钢纳米尺度析出相[J].金属学报,2011,47(2):251-256.Duan Xiugang,Cai Qingwu,Wu Huibin.Ti-Mo ferrite matrix microalloy steel with nanometer-sized precipitates[J].Acta Metallurgica Sinica,2011,47(2):251-256.
[11]韩杰,刘艳林,孙乾双,等.Ti微合金钢热变形后连续冷却相变及第二相析出行为[J].山东冶金,2014,36(4):41-47.Han Jie,Liu Yanlin,Sun Qianshuang,et al.Phase transformation and second-phase precipitation behavior of Ti microalloyed steel during continuous after hot deformation[J].Shandong Metallurgy,2014,36(4):41-47.
[12]潘辉,周娜,李飞,等.Ti微合金化高强机械用钢控轧控冷工艺研究[J].轧钢,2013,30(3):25-28.Pan Hui,Zhou Na,Li Fei,et al.Study on TMCP technology of Ti microalloyed high strength machinery steel[J].Steel Rolling,2013,30(3):25-28.