FeTiP相在高强IF钢热轧过程中析出行为的研究  

Precipitation behavior of FeTiP phase during high strength IF steel hot rolling

作　　者：王畅 王林 于洋 高小丽 吴耐[2] 陈瑾[2] WANG Chang;WANG Lin;YU Yang;GAO Xiaoli;WU Nai;CHEN Jin(Research Institute of Technology of Shougang Group Co.,Ltd.,Beijing 100043,China;Beijing Shougang Co.,Ltd.,Qianan 064400,China;Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology,Beijing 100043,China)

机构地区：[1]首钢集团有限公司技术研究院,北京100043 [2]北京首钢股份有限公司,河北迁安064404 [3]绿色可循环钢铁流程北京市重点实验室,北京100043

出　　处：《轧钢》2021年第1期20-25,共6页Steel Rolling

摘　　要：利用电阻炉、Gleeble热模拟试验机和透射电镜,分析了高强IF钢中FeTiP相在热轧过程的析出行为。结果表明,高强IF钢连铸坯中心位置存在少量的FeTiP相析出物,但经过加热和长时间保温,析出物可完全回溶;在热轧过程中,轧制温度范围内的应变诱导析出物主要为TiS相、Ti4C2S2相和TiC相,难以捕捉到明显的FeTiP相存在;FeTiP相的析出主要发生于带钢卷取过程,层冷冷速对FeTiP相和P元素在晶界析出有重要的影响,当层冷冷速为10℃/s时,晶界处易发现棒状和蠕虫状的FeTiP相析出物,同时析出物中的P含量明显升高。因此,可以采取扩大带钢终轧和卷取的温差以及提高层冷冷速等方法来控制热轧带钢晶界处FeTiP相析出物,以利于改变高强IF钢的韧脆转变温度以及提高其深冲性能。The precipitation behavior of FeTiP phase during high strength IF steel hot rolling was analyzed by furnace,Gleeble simulator and transmission electron microscope.The results show that there is a small amount of FeTiP phase in the central of continuous casting slab,which can be completely dissolved after long-time heat holding in the furnace.The precipitates types of strain induced in the hot rolling temperature range are mainly TiS,Ti4C2S2and TiC,and it is difficult to capture FeTiP phase.The FeTiP phase mainly lies in the coiling process,and the cooling speed has important effect on the FeTiP phase formation and P element boundary segregation.The cooling speed is controlled under the condition of 10℃/s,the FeTiP phase which like stick or wormlike can be find at grain boundary,and its P content is significantly increased at the same time.The process improvement measures of hot rolling,such as enlarging the temperature difference between finishing rolling and coiling,and improving the cooling speed were proposed for controlling FeTiP phase precipitated at grain boundary.Based on these methods,the ductile-brittle transition temperature and stamping performance of the IF steel were improved.

关 键 词：含磷高强IF钢 FeTiP相 应变诱导析出 层冷冷速 析出物 

分 类 号：TG335[金属学及工艺—金属压力加工]