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首页> 外文会议>International Symposium on Superalloys 718, 625, 706 and Various Derivatives Jun 17-20, 2001 >FRECKLES IN REMELTED NIOBIUM CONTAINING SUPERALLOYS
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FRECKLES IN REMELTED NIOBIUM CONTAINING SUPERALLOYS

机译：重熔含铌超级合金中的碎片

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摘要

Freckle defects can be found in several niobium-containing nickel base superalloys. The freckles in VAR or ESR ingots of 718, 706, 625 and other model alloys were analyzed using Scanning Electron Microscopy (SEM) / Energy Dispersive Spectrometry (EDS) and Differential Thermal Analysis (DTA). The compositions and the transformation temperatures of the freckled areas were determined. It is found that for most of the alloys the composition and melting temperature of the freckle body usually correspond to a solidification moment when about 70% liquid has transformed into solid, though in some alloys the correspondent volume fraction was found to be higher. Freckle criterion considering the compositional effect is proposed for the evaluation of the freckle potential of alloys. Quantitative calculation results of the alloys using the criterion are presented and discussed in terms of the experimental measurements.
机译：在几种含铌的镍基高温合金中会发现雀斑缺陷。使用扫描电子显微镜（SEM）/能量色散谱（EDS）和差热分析（​​DTA）分析了718、706、625和其他模型合金的VAR或ESR铸锭中的雀斑。确定了雀斑区域的组成和转变温度。已发现，对于大多数合金，当约70％的液体已转变为固体时，雀斑体的组成和熔化温度通常对应于凝固时刻，尽管在某些合金中发现相应的体积分数更高。提出了考虑成分效应的雀斑判据，以评价合金的雀斑电位。提出并讨论了使用该标准对合金进行定量计算的结果。

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