控轧控冷工艺对高强度结构钢组织及力学性能的影响  

Effect of TMCP Parameters on Microstructure and Mechanical Properties of High-Strength Structural Steel

作　　者：蓝慧芳[1] 杜林秀[1] 刘彦春[1] 刘相华[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2009年第2期200-204,共5页Journal of Northeastern University(Natural Science)

基　　金：国家科技支撑计划项目(2006BAE03A08)

摘　　要：探讨了控制轧制及加速冷却过程中工艺参数对高强度结构钢组织及性能的影响；借助光学显微镜、扫描电镜、电子背散射衍射对钢的强韧化机制进行了分析．通过合理选择两阶段控轧＋快速冷却参数，获得了满足国标GB／T16270—1996中Q690，Q620和Q550要求的高强度钢板；得出了终轧温度、终冷温度和冷却速度与力学性能之间关系的回归方程，并分析了这些因素对显微组织及力学性能的影响．结果表明：在终轧温度870～880℃，冷速15～20℃／s的条件下，终冷温度570～600℃，能够达到Q550的要求；终冷温度500～570℃，能够达到Q620的要求；冷速提高至35～40℃／s，终冷温度在550℃左右，能够达到0690的要求．Discusses the effects of TMCP parameters, i.e. the processing parameters, on the microstructure and mechanical properties of high-strength structural steel. And the strengthening/toughening mechanism of the steel is investigated by virtue of optical microscope, SEM（scanning electron microscope） and EBSD（electron backscattered diffraction）. By choosing properly the parameters of the two-stage controlled rolling and accelerated cooling process, the high strength structural steels were obtained coming up to China＇ s National Standards Q690, Q620 and Q550 as included in GB/T16270--1996. The regression equations describing relationship between such processing parameters as finish rolling/cooling temperature, cooling rate and mechanical properties are thus given, and how those parameters affect the microstructure and mechanical properties are analyzed. The results showed that the steel plates can be up to the standard Q550 if the finish rolling temperature θR = 870--880 ℃, cooling rate vC = 15 --20 ℃/s and finish cooling temperature θPC〈 = 570-- 600℃ ; up to Q620 if θPC： = 500 - 570 ℃ with other conditions unchanged; up to Q690 if vc = 35-40 ℃/s and θPC≈550 ℃ with θFR unchanged.

关 键 词：控轧控冷 高强度结构钢 工艺参数 强韧化机制 力学性能 显微组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG335.5[金属学及工艺—金属材料]