利用热模拟、扫描电镜、透射电镜等分析手段研究了控轧工艺和冷却制度等对X100管线钢微观组织和显微硬度的影响。结果表明：在820℃变形时,随变形量增加,试验钢中板条贝氏体比例减少,粒状贝氏体比例增加,组织逐渐细化,显微硬度明显下降;400℃终冷时,随冷却速度的增加,粒状贝氏体组织逐渐细化,马奥岛数量减少,颗粒尺寸减小,显微硬度增加;在600～350℃范围终冷时,随终冷温度降低,贝氏体组织细化,马奥岛体积分数减少,颗粒尺寸减小,终冷温度降低到300℃时,组织中出现了大量硬相的板条贝氏体组织;显微硬度随着终冷温度的降低而增加。
Effects of rolling and cooling processes on microstructure and microhardness of X100 pipeline steel were investigated by means of thermal simulation,scanning electron microscopy（SEM） and transmission electron microscopy（TEM）.The results show that processing parameters have significant influence on both microstructure and mechanical properties of the steel.The volume fraction of bainitic ferrite decreases,whereas that of granular bainite increases with increasing deformation in the range of 20%-40%.At the same time,microstructure is refined and hardness is reduced obviously.When the finish cooling temperature is 400 ℃,granular bainite is refined and microhardness of the steel increases with increasing cooling rate,at the same time the volume fraction of M-A islands decreases and the grain size of M-A islands is refined.Granular bainite and M-A islands are both refined,and the volume fraction of M-A islands is reduced with decreasing finish cooling temperature in the range of 600-350 ℃,a large amount of bainitic ferrites in the steel is observed when the finish cooling temperature is 300 ℃.Hardness increases with the decrease of finish cooling temperature.
参考文献
| [1] | 王春明,鲁强,吴杏芳.管线钢的合金设计[J].鞍钢技术,2004(06):22-28. |
| [2] | 丁文华,李淼泉.合金元素和控轧控冷工艺在管线钢研制中的应用[J].材料导报,2007(09):67-70,76. |
| [3] | Christoph Kalwa;Hans-Georg;Hillenbrand.High strength steel pipes:New developments and applications[A].,2002:1-12. |
| [4] | 张小立;冯耀荣;庄传晶.X100高钢级管线钢的发展及组织设计[J].材料导报,2007(05):34-38. |
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