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在Ｇｌｅｅｂｌｅ１５００热模拟机上，利用热膨胀法建立了１０ＭｎＭｏＮｉＮｂ钢在８００℃变形５０％后的连续冷却相变曲线（动态ＣＣＴ曲线），并采用光学金相和ＴＥＭ方法分析了在不同冷速条件下，形变奥氏体的相变产物。结果表明，钢的相变组织主要由冷速决定，快冷显著抑制先共析铁素体相变，中温相变产物为贝氏体组织，其中贝氏体铁素体为针状铁素体和粒状铁素体，均含有较高密度的位错和Ｍ／Ａ岛状组织，并且在中温转变时无明显的碳化物生成。
On the Gleeble1500 thermal simulator, the continuous cooling phase transformation curve (dynamic CCT curve) of 10MnMoNiNb steel after 50% deformation at 800 ℃ was established by thermal expansion method. Optical and metallographic and TEM methods were used to analyze the deformation of the 10MnMoNiNb steel under different cooling conditions. Austenite transformation products. The results show that the phase transformation microstructure of steel is mainly determined by the cooling rate. Rapid cooling significantly inhibits the transformation of proeutectoid ferrite and the intermediate temperature transformation product is bainite. The bainitic ferrite is acicular ferrite And granular ferrite, both contain higher density of dislocations and M / A island-like tissues, and there is no obvious formation of carbides at intermediate temperature transformation.