论文部分内容阅读
利用热模拟技术(DIL805A热膨胀仪)和显微分析方法,对不同成分体系X100/X120高强度管线钢在连续冷却转变下的显微组织的变化规律进行了研究。研究结果表明,对于无B钢,随冷速增加,组织中依次出现多边形铁素体(PF)、粒状贝氏体(GB)、贝氏体铁素体(BF)和马氏体(M)。B元素的添加使得管线钢相变开始温度降低到500℃左右,抑制了多边形铁素体的形成,促进了贝氏体的形成。为了获得高级别管线钢X100的复相组织,无B钢的冷却速度应控制在20～30℃/s,而含B钢的冷速只需控制在5～15℃/s,简化了冷却工艺。
The microstructure of X100 / X120 high strength pipeline steel under continuous cooling transformation was studied by means of thermal simulation (DIL805A) and microscopic analysis. The results show that with the increase of cooling rate, polygonal ferrite (PF), granular bainite (GB), bainitic ferrite (BF) and martensite (M) . The addition of B element reduced the onset temperature of phase transition of pipeline steel to about 500 ℃, inhibited the formation of polygonal ferrite and promoted the formation of bainite. In order to obtain the complex phase structure of X100 high-grade pipeline steel, the cooling rate of non-B steel should be controlled at 20-30 ° C / s, while the cooling speed of B-containing steel only needs to be controlled at 5-15 ° C / s, which simplifies the cooling process .