采用热模拟技术和显微分析方法,对X100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.通过X100管线钢CCT曲线的建立和组织分析表明:当冷却速度低于0.2℃/s时,组织类型以多边形铁素体(pv)为主.在0.5～10℃/s的冷却速度范围,主体组织为准多边形铁素体(QF)和粒状铁素体(GF).当冷却速度大于20℃/s,组织以贝氏体铁素体(BF)为主.大于50℃/s的冷却速度,将形成马氏体(M).
Microstrueture in a continuously cooled X100 high strength pipeline steel was investigated by means of heat simulation technique on a Gleeble-1500 simulator, optical microssope(OM)and transmission electron mieroseopy(TEM). The results show that the microstructure of X100 high strength pipeline steel is mainly composed of polygonal ferrite(PF) when the cooling rate is lower than 0. 2 ℃/s. Quasi-polygonal ferrite and granular ferrite (QF + GF)prevails in the steel with the cooling rate of 0.5 -10 ℃/s. When the cooling rate is higher than 20 ℃/s, the microstructure of X100 pipeline steel mainly consists of bainitic ferrite(BF). Martensite(M) forms in the steel with the cooling rate higher than 50 ℃/s.
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