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首页> 外文会议>International Conference on Solidification and Gravity; 20040906-09; Miskolc-Lillafured(HU) >Segregation Effects and Phase Developments during Solidification of Alloy 625
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Segregation Effects and Phase Developments during Solidification of Alloy 625

机译：625合金凝固过程中的偏析效应和相发展

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摘要

The solidification behaviour of pure Alloy 625, and Alloy 625 enriched respectively in iron and carbon, was investigated in situ by hot-stage light optical microscopy. Using this technique planar front solidification for distances of several hundred microns was facilitated. After solidification, the material that experienced planar front solidification corresponded accurately to that of den-drites tens of microns in width adopting an equivalent dendrite arm width approach. Eventually, the planar solidification front broke down, where after the residual liquid solidified eutectic-like. This material contained γ-phase, Laves phase and, if carbon was dissolved in the liquid, niobium rich carbides formed. Molybdenum and niobium showed strong tendencies to segregate. Their segregation was balanced by inverse segregation of nickel and iron. The chromium concentration remained almost constant in γ in the entire matrix material. Addition of carbon did not cause detectable alterations of the material that experienced planar front solidification. However, it promoted the formation of niobium rich carbides in the material that solidified eutectic-like. Thus, this material differed from that of the pure sample in constitution, and consequently in γ-phase composition. Niobium rich carbides formed prior to Laves phase; in carbon rich volumes only the carbides form. As compared to the pure sample, the sample enriched in iron had decreased global minimal solute concentration in the material that experienced planar front solidification. However, once the concentrations were corrected with respect to the dilution simply caused by the presence of iron, the solidification behaviour in this material was identical to that of the pure sample. The constitution in the material that solidified eutectic-like was γ and Laves phase. As compared to the pure sample, the Laves phase was enriched in iron.
机译：通过热台光学显微镜原位研究了纯合金625和分别富含铁和碳的625合金的凝固行为。使用这种技术可以促进数百微米距离的平面前固化。固化后，经历了平面正面固化的材料与采用等效枝晶臂宽度法的数十微米宽度的枝晶精确地对应。最终，平面凝固前沿破裂，之后残余液体凝固成共晶状。该材料包含γ相，Laves相，如果碳溶解在液体中，则会形成富铌的碳化物。钼和铌显示出强烈的偏析趋势。镍和铁的反向偏析平衡了它们的偏析。在整个基体材料中，γ中的铬浓度几乎保持恒定。碳的添加不会导致经历平面前部固化的材料发生可检测的变化。但是，它促进了凝固类似共晶的材料中富铌碳化物的形成。因此，该材料在构造上与纯样品的材料不同，因此在γ相组成上也不同。 Laves相之前形成的富铌碳化物；在富碳体积中，仅碳化物形成。与纯样品相比，富含铁的样品在经历了平面前沿凝固的材料中降低了整体最小溶质浓度。但是，一旦就仅由于铁的存在引起的稀释而对浓度进行了校正，该材料中的凝固行为就与纯样品的凝固行为相同。凝固了共晶状的材料的构成为γ和Laves相。与纯样品相比，拉夫斯相富含铁。

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