X100级管线钢的组织和强韧性  

Microstructure Characteristics and Strength-toughness of X100 Pipeline Steel

作　　者：段琳娜[1,2] 刘清友[2] 贾书君[2] 贾成厂[1] 谭峰亮[2,3] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]钢铁研究总院结构所,北京100081 [3]昆明理工大学冶金与能源工程学院,昆明650093

出　　处：《材料研究学报》2012年第4期443-448,共6页Chinese Journal of Materials Research

摘　　要：用光学显微镜、扫描电镜、透射电镜和EBSD等方法研究了X100管线钢热连轧钢带的微观组织、析出物、晶粒尺寸等对X100管线钢强韧性的影响。结果表明,通过合理的成分设计和TMCP工艺得到的X100管线钢的平均有效晶粒尺寸约为2.38μm,晶内含有大量位错和亚结构;显微组织由粒状贝氏体、板条贝氏体和M/A岛组成,组织中粒状贝氏体含量较多,板条贝氏体含量较少,M/A岛尺寸较小,弥散分布;细小的第二相能有效钉扎位错的移动,产生沉淀强化效果;实验钢的抗拉强度高于970 MPa,屈服强度高于800 MPa,-40℃以上的Charpy冲击功大于250 J,韧脆转变温度在-40℃与-60℃之间。The effects of microstructure, precipitate and grain size on strength and toughness of Xl00 hot rolled strips steel were investigated by means of optical microscope, scanning electronic microscopy （SEM）, transmission electron microscopy （TEM） and electron backscattered difl：raction （EBSD） in this article. The results show that average effective grain size of Xl00 pipeline steel with reasonable composition design reaches to 2.38μm after selected thermo-mechanical control process （TMCP）, and there are a great quantity of dislocations and substructures in grains. Microstructure of Xl00 strips mainly consists of granular bainite, lath bainite with plenty of fine M/A islands dispersing in the matrix or on grain boundaries. Fine precipitation particles can pin dislocation effectively, tensile strength of tested steel are higher than 970 MPa, yield strength are higher than 800 MPa, Charpy impact energy （higher than -40℃） are higher than 250 J, and ductile brittle transition temperature is between -40℃ and -60℃.

关 键 词：金属材料 X100管线钢 微观组织 粒状贝氏体 EBSD 强韧性 

分 类 号：TG142[一般工业技术—材料科学与工程]