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中文摘要：
研究加氮和不加氮的两种半高速钢（低合金高速钢）的奥氏体冷却转变动力学行为，建立并对比分析两种钢的连续冷却转变图（CCT图）。采用图象分析仪和扫描电镜以及能谱仪（EDS）分析了淬火加热的碳化物数量及成分的变化规律。结果表明，加氮的半高速钢中氮化物相对含有较多的V、W、Mo和较少的Cr元素，淬火加热时表现出较高的稳定性；氮的添加使Ac1和Ms／Mf温度下降，显著提高了淬透性。
英文摘要：
The austenite cooling transformation kinetics of a semi low alloy high speed steel（semi-HSS） with and without nitrogen addition were studied and their continuous cooling transformation diagram（ CCT diagram）were established. The stability and composition of the carbides were also studied using TEM, SEM-EDS. The results show that the addition of nitrogen can improve hardenability and reduce Ac1 and Ms/Mf point of the steel. The carbides contain much V, W, Mo and less Cr leading to exhibit higher stability in the semi-HSS with nitrogen addition.
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