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℃.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2012年第4期443-448,共6页
Chinese Journal of Materials Research
关键词
金属材料
X100管线钢
微观组织
粒状贝氏体
EBSD
强韧性
metallic materials, XIO0 pipeline steel, microstructure, granular bainite, EBSD, strengthand toughness
