Ti-Mo铁素体基微合金钢的连续冷却转变行为  

Continuous cooling transformation behavior of Ti-Mo ferrite-based microalloyed steel

作　　者：杨洪波[1] 孙佳通 赵贺然 王豪 亓伟伟 YANG Hong-bo;SUN Jia-tong;ZHAO He-ran;WANG Hao;QI Wei-wei(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Technical Center,Laiwu Branch of Shandong Iron and Steel Co Ltd,Jinan 271100,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]山东钢铁股份有限公司莱芜分公司技术中心,山东济南271100

出　　处：《材料热处理学报》2023年第7期127-133,共7页Transactions of Materials and Heat Treatment

基　　金：陕西省自然科学基础研究计划资助项目(2021JM369)。

摘　　要：利用Gleeble 3800热模拟实验机分别获得了Ti-Mo铁素体基微合金钢在静态和动态经不同速率冷却后的温度-膨胀量曲线,结合金相法绘制了Ti-Mo微合金钢的连续冷却转变(CCT)曲线。结果表明:无论是静态CCT还是动态CCT,随着冷却速率的增大,实验钢的珠光体与铁素体均减少,贝氏体体积分数增加,当冷却速率达到30℃/s时,组织全部为贝氏体。实验钢铁素体相变的开始温度为800℃,压缩变形扩大了珠光体相区使其向左扩张,缩小了贝氏体相区,并降低铁素体转变开始温度。在制定控轧控冷工艺时,为了使实验钢在卷取过程中获得铁素体+粒状贝氏体组织,从而进一步优化强韧性能,建议Ti-Mo铁素体基微合金钢终轧温度应高于800℃,轧后冷却速率应高于30℃/s,并且要在贝氏体相变高温区完成卷取。The temperature-expansion curves of Ti-Mo ferrite-based microalloyed steel after static and dynamic cooling at different rates were obtained by using Gleeble 3800 thermal simulation machine,and the continuous cooling transformation(CCT)curves of the Ti-Mo microalloyed steel were drawn by the metallographic method.The results show that whether it is static CCT or dynamic CCT,with the increase of cooling rate,the pearlite and ferrite of the experimental steel decrease and the volume fraction of bainite increases.When the cooling rate reaches 30℃/s,the microstructure is all bainite.The starting temperature of ferrite transformation of the experimental steel is about 800℃.The compression deformation expands the pearlite phase zone to the left,reduces the bainite phase zone,and reduces the starting temperature of ferrite transformation.When formulating the controlled rolling and cooling process,in order to make the experimental steel obtain ferrite+granular bainite structure during the coiling process,to further optimize the strength and toughness,it is suggested that the final rolling temperature of the Ti-Mo ferrite-based microalloyed steel should be higher than 800℃,the cooling rate after rolling should be higher than 30℃/s,and the coiling should be completed in the high temperature zone of bainite transformation.

关 键 词：Ti-Mo微合金钢 CCT 微观组织 冷却速率 维氏硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]