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首页> 外文期刊>High temperature materials and processes >Effects of Nb and V on the Precipitation Phases of MX in Q345E Applicable to Cryogenic Flange
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Effects of Nb and V on the Precipitation Phases of MX in Q345E Applicable to Cryogenic Flange

机译：Nb和V对Q345E适用于低温法兰的MX析出相的影响

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Thermodynamic software (Thermo-Calc) is utilized to Q345E applicable to cryogenic flange. The aim is to study the equilibrium precipitation phases between 400 and 1600 °C, and the solubility of Nb and V in austenite. The effects of alloying elements, such as C, N, Nb and V, on these equilibrium precipitation phases are also discussed. Besides theoretical calculation, transmission electron microscopy (TEM) is used to observe these precipitation phases. The results show that main equilibrium precipitation phases are M7C3, MX#1 (Nb-rich), MX#2 (V-rich) and AlN. Among them, the MX#1 phase is composed of major elements (Nb, C, and N) and minor elements (V and Cr). For MX#2 phase, its major elements are V, C, Nb, and N, and minor element is Cr. The precipitation amount and temperature of MX#1 phase were controlled by Nb content, and little affected by the contents of C, N and V. TEM results reveal that the size of precipitation phases varied from several nanometers to more than 100 nm. Large precipitation particles belong to MX#1 phase (Nb-rich), and their morphology tends to be cubic. On the other side, the small precipitation particles are attributed to MX#2 phase (V-rich), and their morphology is spherical or elliptical. These results are consistent with the thermodynamic calculation results about phase composition and precipitation temperature of MX#1 and MX#2.
机译：Q345E采用热力学软件（Thermo-Calc），适用于低温法兰。目的是研究400至1600°C之间的平衡析出相以及Nb和V在奥氏体中的溶解度。还讨论了合金元素（如C，N，Nb和V）对这些平衡析出相的影响。除了理论计算之外，还使用透射电子显微镜（TEM）观察这些沉淀相。结果表明，主要的平衡沉淀相为M7C3，MX＃1（富Nb），MX＃2（富V）和AlN。其中，MX＃1相由主要元素（Nb，C和N）和次要元素（V和Cr）组成。对于MX＃2相，其主要元素为V，C，Nb和N，次要元素为Cr。 MX＃1相的沉淀量和温度受Nb含量的控制，而C，N和V含量的影响很小。TEM结果表明，沉淀相的大小从几纳米到100 nm以上不等。大的沉淀颗粒属于MX＃1相（富Nb），其形态倾向于立方。另一方面，小的沉淀颗粒归因于MX＃2相（富V），其形态为球形或椭圆形。这些结果与关于MX＃1和MX＃2的相组成和沉淀温度的热力学计算结果一致。

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