控轧控冷对高强建筑用钢组织与性能的影响
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摘要
对一种试验性的高强建筑用钢进行了控制轧制和控制冷却处理,研究了终冷温度对试验钢力学性能和显微组织的影响,并对拉伸断口形貌进行了观察。结果表明,试验钢在终冷温度为450℃时具有较高的强塑性和低屈强比,能够满足780 MPa级高层低屈强比建筑用钢的要求;在终冷温度为650℃时,试验钢中的M-A岛状组织更加粗大、含量相对较高,形状主要以多边形和和条带状形态为主,而终冷温度为450℃时,试验钢中M-A岛状组织的数量相对较多,尺寸相对细小,且主要以颗粒状形态存在;贝氏体铁素体基体上弥散分布着颗粒状M-A岛的复相组织有利于提高试验钢的强塑性并降低屈强比;终冷温度为450℃时试验钢的抗拉强度、规定塑性延伸强度、断后伸长率和屈强比分别为1070 MPa、825 MPa、16. 6%和0. 771。
Controlled rolling and controlled cooling treatment were carried out for a experimental high strength building steel. The influence of final cooling temperature on the mechanical properties and microstructure of the tested steel was studied,and the tensile fracture surface was observed. The results show that when end cooled at 450 ℃,the tested steel has high strength,high plasticity and low yield ratio,which can meet the requirements of 780 MPa low yield ratio building steel for high rise buildings. When the end cooling temperature is 650 ℃,MA island structure in the experiment steel is more bulky and of relatively high content,mainly in polygon shape and banded morphology.When the end cooling temperature is 450 ℃,the number of M-A islands in the tested steel is relatively large,while their size is relatively small,and mainly in granular form. The dispersion of granular M-A island complex on bainite ferrite matrix is beneficial to enhance the strength,plasticity and to reduce the yield ratio of the tested steel. The tensile strength,proof strength at 0. 2% plastic extension,elongation after fracture and yield ratio are 1070 MPa,825 MPa,16. 6% and 0. 771 when the end cooling temperature is 450 ℃.
Controlled rolling and controlled cooling treatment were carried out for a experimental high strength building steel. The influence of final cooling temperature on the mechanical properties and microstructure of the tested steel was studied,and the tensile fracture surface was observed. The results show that when end cooled at 450 ℃,the tested steel has high strength,high plasticity and low yield ratio,which can meet the requirements of 780 MPa low yield ratio building steel for high rise buildings. When the end cooling temperature is 650 ℃,MA island structure in the experiment steel is more bulky and of relatively high content,mainly in polygon shape and banded morphology.When the end cooling temperature is 450 ℃,the number of M-A islands in the tested steel is relatively large,while their size is relatively small,and mainly in granular form. The dispersion of granular M-A island complex on bainite ferrite matrix is beneficial to enhance the strength,plasticity and to reduce the yield ratio of the tested steel. The tensile strength,proof strength at 0. 2% plastic extension,elongation after fracture and yield ratio are 1070 MPa,825 MPa,16. 6% and 0. 771 when the end cooling temperature is 450 ℃.
引文
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[3]李军,刘文义.热处理对高层建筑用钢微观组织与力学性能的影响[J].热加工工艺,2018,47(16):203-207.Li Jun,Liu Wenyi.Effect of heat treatment on microstructure and mechanical properties of high-rise building steel[J].Hot Working Technology,2018,47(16):203-207.
[4]熊雪刚,张开华,叶晓瑜,等.钛微合金化和冷却工艺对建筑用钢屈服平台的影响[J].金属热处理,2018,43(8):35-38.Xiong Xuegang,Zhang Kaihua,Ye Xiaoyu,et al.Effects of titanium microalloying and cooling processes on yield platforms of building steels[J].Heat Treatment of Metals,2018,43(8):35-38.
[5]孙海宁,李英龙,石晓凯.两相区淬火+回火对建筑用钢组织与性能的影响[J].金属热处理,2018,43(4):167-172.Sun Haining,Li Yinglong,Shi Xiaokai.Effect of two-phase zone quenching+tempering on microstructure and properties of building steel[J].Heat Treatment of Metals,2018,43(4):167-172.
[6]Ueda Keiji,Endo Shigeru,Ito Takayuki.780 MPa grade steel plates with low yield ratio by microstructural control of dual phase[J].JFETechnical Report,2007(18):23-28.
[7]张唯煜.合金元素V及控轧控冷工艺对大跨度建筑用抗震钢板组织与性能的影响[J].金属热处理,2014,39(6):123-125.Zhang Weiyi.Effect of alloy element V and controlled rolling and controlled cooling process on the structure and properties of large span construction steel plate[J].Heat Treatment of Metals,2014,39(6):123-125.
[8]岳重祥,白晓虹,李成良,等.低成本Q500E低合金高强度厚钢板的开发[J].金属热处理,2012,37(10):1-7.Yue Chongxiang,Bai Xiaohong,Li Chengliang,et al.Development of low cost Q500E low alloy high strength thick steel plate[J].Heat Treatment of Metals,2012,37(10):1-7.
[9]Liu Y,Zhu F,Li Y,et al.Effect of TMCP parameters on the microstructure and properties of an Nb-Ti microalloyed steel[J].ISIJInternational,2006,45(6):851-857.
[10]Tan W,Han B,Wang S,et al.Effects of TMCP parameters on microstructure and mechanical properties of hot rolled economical dual phase steel in CSP[J].Journal of Iron and Steel Research,2012,19(6):37-41.
[11]Zhang C L,Liu Y Z,Zhou L Y,et al.Effects of TMCP parameters on the microstructure and mechanical properties of Nb-bearing spring steel[J].Journal of Iron and Steel Research,2011,18(S1):581-584.
[12]Lan H F,Lin-Xiu D U,Liu Y C,et al.Effect of TMCP parameters on microstructure and mechanical properties of high-strength structural steel[J].Journal of Northeastern University,2009,30(2):200-204.