700MPa级高强钢的CCT曲线分析  

Analysis on Continuous Cooling Transformation (CCT) Curve of 700 MPa Grade High Strength Steel

作　　者：李鹏[1] 王少炳 张智刚 Li Peng;Wang Shao-bing;Zhang Zhi-gang(Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;Inner Mongolia Baotou Steel Rare Earth Steel Plate Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古包钢钢联股份有限公司技术中心,内蒙古包头014010 [2]内蒙古包钢稀土钢板材有限责任公司,内蒙古包头014010

出　　处：《包钢科技》2022年第5期47-50,共4页Science & Technology of Baotou Steel

摘　　要：文章通过使用Formastor-F型全自动相变仪对700 MPa级高强钢的连续冷却转变曲线(CCT曲线)进行了测定,分析了700 MPa级高强钢在0.5~118℃/s之间各种冷速下的显微组织形貌。结果显示,试验钢冷却速度为0.5℃/s时,转变产物为铁素体和珠光体;冷却速度高于1℃/s时,开始形成贝氏体组织;随着冷却速度的逐渐升高,贝氏体组织开始增加,珠光体组织开始减少,当冷却速度为10℃/s时,珠光体组织消失,组织为铁素体和贝氏体;当冷却速度增加到118℃/s时,转变产物以贝氏体为主。通过对700 MPa级高强钢的CCT曲线和显微组织分析为实际生产过程中热处理工艺的制定提供了理论依据。In this paper, it is introduced the CCT curve of 700 MPa grade high strength steel is measured with the Formastor-F full automatic phase change instrument and its microstructures at various cooling rates of 0.5~118 ℃/s are analyzed. The results showed that the transformation product was ferrite and pearlite when the cooling rate of test steel was 0.5 ℃/s;bainite structure began to form when the cooling rate was more than 1 ℃/s;bainite structure began to increase and perlite structure began to reduce with the cooling rate gradually increased;pearlite structure disappeared as well as the structure was ferrite and bainite when the cooling rate was 10 ℃/s;transformation products were mainly bainite when the cooling rate increased to 118 ℃/s. The analysis on the CCT curve and microstructure of 700 MPa grade high strength steel provide the theoretical basis for formulating heat treatment technology in actual production processes.

关 键 词：高强钢 连续冷却 冷却速度 热处理 

分 类 号：TG135.1[一般工业技术—材料科学与工程]