论文部分内容阅读
采用两种冷却路径控制工艺试制了X80级抗大变形管线钢,并利用扫描电镜和透射电镜进行了显微组织观察,研究了轧后冷却工艺对X80级抗大变形管线钢组织性能的影响。结果表明,轧后采用前段空冷+后段快冷的“两段式冷却”工艺所得显微组织为先共析铁素体、针状铁素体、少量贝氏体和M/A岛,组织中软硬相匹配良好,屈强比为0.76;而超快冷+空冷+快冷的“三段式冷却”工艺获得针状铁素体、贝氏体和M/A岛混合组织,屈强比为0.8。两种冷却工艺均可获得抗大变形管线钢,差别在于应用三段式冷却工艺得到实验钢的强度较高,可用于开发更高级别抗大变形管线钢,并且空冷时间缩短。
Two kinds of cooling path control technology were used to manufacture X80-class large deformation-resistant pipeline steel. The microstructure of the X80-grade large deformation pipeline steel was studied by scanning electron microscopy and transmission electron microscopy. The results show that the microstructure of pro-eutectoid ferrite, acicular ferrite, a small amount of bainite and M / A island , The organization of soft and hard phase matching good, yield ratio of 0.76; and ultra-fast cooling + air cooling + fast cooling “three-stage cooling ” technology to obtain acicular ferrite, bainite and M / A island mixture Tissue, yield ratio of 0.8. The two cooling processes are available for large deformation of pipeline steel, the difference is that the application of three-stage cooling process experimental steel obtained higher strength, can be used to develop higher levels of resistance to large deformation of pipeline steel, and air cooling time is shortened.