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Influence of normalizing heat treatment on precipitation behaviour in modified 9Cr-1Mo steel

机译：正火对改性9Cr-1Mo钢析出行为的影响

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Precipitation behaviour during normalizing heat treatment has been investigated on modified 9Cr- 1Mo steel. Heterogeneously distributed spherical MX particles and platelet M_3C were observed in the as-normalized condition. The number of the precipitates decreased with increasing normalizing temperature and no precipitates was observed after normalizing at 1250 deg C. The size of MX increased with an increase in normalizing temperature up to 1200 deg C. For MX, not only size, but also composition of metallic elements was influenced by the normalizing temperature. Since equilibrium composition of MX depends on temperature, an MX particle with non-equilibrium composition dissolves and precipitation of it takes place with its equilibrium composition at the normalizing temperature. A phase field diagram of NbX-VX quasi binary system in modified 9Cr-lMo steel was experimentally determined. It has been supposed that precipitation of M_3C takes place during cooling from normalizing temperature in the surrounding area of MX particles where the concentration of niobium and vanadium in matrix is poor.
机译：已对9Cr-1Mo改性钢进行了正火热处理过程中的析出行为。在正常状态下观察到异质分布的球形MX颗粒和血小板M_3C。随正火温度的升高，析出物的数量减少，在1250℃进行正火后，未观察到析出物。MX的大小随正火温度的增加而升高，直至1200℃。对于MX，不仅尺寸，而且其组成金属元素受正火温度的影响。由于MX的平衡组成取决于温度，因此具有非平衡组成的MX颗粒会溶解，并且在正火温度下会以其平衡组成发生沉淀。实验确定了改性9Cr-1Mo钢中NbX-VX准二元体系的相场图。据推测，M_3C的沉淀是在正常温度下冷却时在MX颗粒周围区域（基质中铌和钒的浓度较差）周围的正常温度下发生的。

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