X100高强度管线钢的组织与力学性能  

Microstructure and mechanical property of X100 high strength pipeline steel

作　　者：王莹[1] 赵征志[2] 朱涛[1] 

机构地区：[1]马鞍山钢铁股份有限公司,安徽马鞍山243000 [2]北京科技大学冶金工程研究院,北京100083

出　　处：《材料热处理学报》2012年第11期117-121,共5页Transactions of Materials and Heat Treatment

摘　　要：用扫描电镜(SEM)和拉伸试验研究了控冷工艺对X100管线钢力学性能和显微组织的影响,用透射电镜对X100高钢级管线钢的微观结构、析出物的形态和分布等进行研究。结果表明:卷取温度和冷却速度显著影响X100管线钢的组织和力学性能。随着卷取温度的降低和轧后冷却速率的升高,试样的强度提高,伸长率下降。以粒状贝氏体GB(Granular Bainite)为主的基体加上少量贝氏体铁素体BF(Bainite Ferrite)及弥散分布的细小M/A构成的组织具有较好的强度和韧性匹配。Effect of controlled cooling on mechanical properties and microstructure of the X100 high strength pipeline steel was studied by using scanning electron microscope（SEM） and tensile test.At the same time,the microstructure and the type and distribution of precipitates in the X100 pipeline steel were also investigated by means of transmission electron microscopy（TEM）.The results show that the microstructure and mechanical properties of the X100 pipeline steel are obviously affected by the coiling temperature and the cooling rate.With the coiling temperature decreasing and the cooling rate increasing,strength of the pipeline steel increases,and its total elongation decreases.It is proved that the excellent performance both strength and toughness can be obtained for X100 pipeline steel with the microstructure consisting of granular bainite matrix with a small amount of bainte ferrite and dispersively distributed fine M/A islands.

关 键 词：X100管线钢 粒状贝氏体 析出物 性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]