Dynamic CCT Behaviour of 600 MPa Grade Hot-Rolled Dual Phase Steel and Optimization of Hot-Rolled Coiling Process
摘 要
在传统600 MPa级双相钢成分的基础上,通过适当降低铬、钼元素的含量,设计了中温卷取型热轧双相钢的化学成分,采用热模拟试验研究了试验钢的动态连续冷却转变行为;根据热模拟结果对热轧卷取工艺进行优化,并进行现场工业试制,研究了优化前后的显微组织和性能。结果表明:当冷却速率大于15 ℃·s-1时,试验钢显微组织主要由贝氏体、马氏体和少量铁素体组成,且随着冷却速率的增大,贝氏体由粒状变为板条状,马氏体含量增加;采用优化的中温卷取全程密集冷却工艺生产的热轧双相钢较优化前的晶粒更细小,马氏体含量更高;采用优化工艺生产的热轧双相钢的屈服强度、抗拉强度、硬度均高于优化前的,断后伸长率和扩孔率均低于优化前的,但仍满足标准要求,说明试制的热轧双相钢具有良好的综合力学性能。
Abstract
The chemical composition of medium temperature coiling type hot-rolled dual phase steel was designed by appropriately reducing the content of chromium and molybdenum elements on basis of the composition of traditional 600 MPa grade dual phase steel. The dynamic continuous cooling transformation behaviour of the test steel was analyzed by thermo-simulation. The hot-rolled coiling process was optimized according to the thermo-simulation results, and a trial industrial production was conducted. The microstructure and properties before and after optimization were studied. The results show that when the cooling rate was greater than 15℃·s-1, the microstructure of the test steel mainly consisted of ferrite, martensite and a small amount of bainite; with the increase of cooling rate, bainite changed from granular to lath-shape, and martensite content increased. The grains of hot-rolled dual phase steel produced by optimal medium temperature coiling whole intensive cooling process was finer than that before optimization, and martensite content was higher. The yield strength, tensile strength and hardness of hot-rolled dual phase steel produced by optimal process were all higher than those before optimization; percentage elongation after fracture and hole expansion rate were both lower than those before optimization, but still satisfied the standard requirement, indicating that trial-produced hot-rolled dual phase steel had good comprehensive mechanical properties.
中图分类号 TG115 DOI 10.11973/jxgccl202001007
所属栏目 新材料 新工艺
基金项目
收稿日期 2018/11/8
修改稿日期 2019/9/24
网络出版日期
作者单位点击查看
备注赵楠(1977-),女,山东诸城人,高级工程师,硕士
引用该论文: ZHAO Nan,LIU Xuewei,SUN Mingjun,HUANG Xuchuan. Dynamic CCT Behaviour of 600 MPa Grade Hot-Rolled Dual Phase Steel and Optimization of Hot-Rolled Coiling Process[J]. Materials for mechancial engineering, 2020, 44(1): 39~43
赵楠,刘学伟,孙明军,黄绪传. 600 MPa级热轧双相钢的动态连续冷却转变行为及其热轧卷取工艺的优化[J]. 机械工程材料, 2020, 44(1): 39~43
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参考文献
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【2】唐文军,郑磊,王自强,等. 宝钢1880 mm热轧试生产DP600双相钢的组织性能[J]. 宝钢技术,2010(2):49-52.
【3】谷海容,张建,杨兴亮,等. 高扩孔型铁素体/贝氏体双相钢组织性能研究[J]. 武汉科技大学学报,2011,34(12):419-423.
【4】翟士斌,余万华,周斌斌, 等. Mo元素对热轧双相钢DP600相变规律影响[J]. 材料热处理学报,2015,36(11):54-59.
【5】叶洁云,赵征志,张迎晖, 等. 硅和铬对超高强双相钢组织和性能的影响[J]. 钢铁,2015,50(3):78-83.
【6】季英萍,李炎,魏世忠, 等. 高钒高速连续冷却转变曲线的测定与分析[J]. 机械工程材料,2007,31(7):63-65.
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