采用Gleebl-3800热摸拟试验机，测定了石油套管用钢ERW-N80-1的动态CCT曲线，并通过光学显微镜和电子显微镜对连续冷却后的组织和第二相析出物进行了观察和分析。结果表明随着冷却速度的提高，在连续冷却转变组织中依次出现多边形铁素体、粒状贝氏体、板条状贝氏体、针状贝氏体、板条状马氏体和针状马氏体，M/A组织的形貌依次为细长形、三角形、方形或圆形，高硬度相逐渐增多，试样的宏观硬度逐渐增加；同时，第二相粒子的尺寸趋于均匀，并逐渐细化。
The CCT carve of ERW-N80-1 steel was determined with Gleeble-3800 thermal simulation testing machine. Microstructures and secondary phase after different cooling rates were characterized by optical microscope and electronic microscope (SEM and TEM). The results show that along with increase of cooling speed the microstructures are changed in turn from polygonal ferrite, granular bainite, lath bainite, needle-like bainite, lath martensite and needle-type martensite, slender form, triangle, quadratic form or circle for M/A microstructures. With increase in high hardness phase, sample′s macrohardness is high. At the same time, the size of the secondary phase is homogeneous and fine gradually.
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