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首页> 外文期刊>Materials at High Temperatures >Carbon diffusion in dissimilar joints between P91 and 12Cr1MoV steels welded by different consumables at high temperature
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Carbon diffusion in dissimilar joints between P91 and 12Cr1MoV steels welded by different consumables at high temperature

机译：P91和12Cr1MoV钢在不同耗材焊接下的高温异种接头中的碳扩散。

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摘要

Three consumables: 9CrMoV(N), R31, and GTR-2CM are considered in welding P91 and 12Cr1MoV together. The stable phases and carbon activities of the involved materials were calculated by THERMO-CALC. Carbon diffusion after aging for varying times at 700 degrees C was simulated by dispersed multiphase model in DICTRA. The usage of different weld metals causes different carbon concentration profiles near weld interfaces both on the P91 and 12Cr1MoV sides, driven by their carbon activity difference. Mole fractions of carbides varying with distance were investigated, showing that the formation of carbon-depleted zone (CDZ) and carbon-enriched zone (CEZ) is related to the dissolution and precipitation of M23C6 carbides. To validate the simulation results, the microstructure and hardness near the interface between P91 base and GTR-2CM weld metal were studied. Good agreements on the widths of CDZ and CEZ between modelled and experimental results were obtained.
机译：在将P91和12Cr1MoV焊接在一起时，考虑了三种消耗品：9CrMoV（N），R31和GTR-2CM。所涉及材料的稳定相和碳活度由THERMO-CALC计算。通过分散多相模型在DICTRA中模拟了700℃时效后碳在不同时间的扩散。不同的焊接金属的使用会在P91和12Cr1MoV侧面的焊接界面附近引起不同的碳浓度分布，这是由于它们的碳活度差异所致。研究了随距离变化的碳化物的摩尔分数，表明贫碳区（CDZ）和富碳区（CEZ）的形成与M23C6碳化物的溶解和沉淀有关。为了验证模拟结果，研究了P91基体和GTR-2CM焊接金属之间的界面附近的组织和硬度。在模拟结果和实验结果之间，CDZ和CEZ的宽度取得了良好的一致性。

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