X100管线钢的连续冷却曲线和相变机制  

Continuous Cooling Curve and Phase Transformation Mechanism of X100 Pipeline Steel

作　　者：马晶[1] 龚小涛[1] 马安博[1] MA Jing;GONG Xiaotao;MA Anbo(School of Aeronautical Materials Engineering,Xi'an Aeronautical Polytechnic Institute,Xi'an 710089,China)

机构地区：[1]西安航空职业技术学院航空材料工程学院,陕西西安710089

出　　处：《工业加热》2020年第4期32-36,42,共6页Industrial Heating

基　　金：西安航空职业技术学院院级课题项目(17XHZH-006);陕西高校青年创新团队(2019-73)。

摘　　要：采用Gleeble-3500型热模拟试验机结合显微组织观察和硬度测试法获取了X100管线钢的临界点温度并绘制出实验钢的过冷奥氏体的连续冷却转变曲线(CCT曲线),分析了连续冷却过程中材料的组织转变规律。结果表明:不同冷却速度下,试验钢获取了不同的显微组织类型。当冷却速率为0. 5~10℃/s时,试验钢的主体组织为准多边形铁素体和粒状贝氏体;当冷却速度在20~50℃/s,试验钢形成了细小、多位向分布的贝氏体和弥散分布的M/A组元,试验钢钢因具备复相组织,通过软硬两相的搭配,赋予了材料高的强、塑特性。The critical point temperature of X100 pipeline steel was obtained by using Gleeble-3500 thermal simulation tester combined with microstructure observation and hardness test method,and the continuous cooling transformation curve( CCT curve) of the subcooled austenite of the experimental steel was drawn. Regularity of material transformation during continuous cooling. The results show that different microstructure types were obtained in the test steel under different cooling rates. When the cooling rate is in the range of 0. 5 ~ 10 ℃/s,the main structure of the test steel is quasi-polygonal ferrite and granular bainite;when the cooling rate is 20 ~ 50 ℃/s,the test steel forms a small Orientally distributed bainite and diffusely distributed M/A components. Because the test steel has a multiphase structure,the combination of soft and hard phases has given the material high strength and plastic properties.

关 键 词：X100管线钢 连续冷却曲线 相变机制 

分 类 号：TG142.1[一般工业技术—材料科学与工程]