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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。
The effects of controlled cooling process on mechanical properties and microstructure of X100 pipeline steel were studied by scanning electron microscope (SEM) and tensile test. The microstructure, precipitation morphology and distribution of X100 high grade pipeline steel were studied by transmission electron microscopy the study. The results show that the coiling temperature and cooling rate significantly affect the microstructure and mechanical properties of X100 pipeline steel. As the coiling temperature decreases and the post-rolling cooling rate increases, the strength of the sample increases and the elongation decreases. Tissue composed of granular Bainite (GB) matrix with a small amount of Bainite Ferrite (Bainite Ferrite) and finely dispersed M / A dispersed particles have good strength and toughness matching.