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首页> 外文会议>International Symposium on Superalloys 718, 625, 706 and Various Derivatives Jun 17-20, 2001 >MAKING OF ALLOY 706 INGOT FOR GAS TURBINE PARTS
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MAKING OF ALLOY 706 INGOT FOR GAS TURBINE PARTS

机译：燃气轮机零件的706合金锭的制造

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摘要

In general, Alloy 706 ingots for gas turbine parts are made by the VIM-ESR-VAR triple melt process due to strong segregation tendency of the alloy. From the viewpoint of cost and delivery time saving, the Japan Steel Works has applied the VIM-ESR double melt process. To optimize ESR condition, relationships between melt rate and local solidification time, and between chemical composition and viscosity of slag have been investigated. The calculation shows that there is a range of melt rate which minimizes the local solidification time, and a melt rate between 300 and 400kg/h is considered adequate for a dia 650mm ingot. Increase in CaF_2 content in CaF_2-Al_2O_3-CaO slag system is found to reduce the viscosity of slag, and a slag with high CaF_2 content, i.e. with low viscosity, is used for industrial scale production. With the optimized ESR conditions obtained in the present study, a dia 650mm Alloy 706 ingot has successfully been produced with minimum segregation by the VIM-ESR double melt process.
机译：通常，由于合金的强烈偏析趋势，用于燃气轮机零件的706合金锭是通过VIM-ESR-VAR三重熔炼工艺制成的。从节省成本和节省交货时间的角度来看，日本制钢所采用了VIM-ESR双熔炼工艺。为了优化电渣重熔条件，研究了熔体速度与局部凝固时间之间，熔渣化学成分与黏度之间的关系。计算结果表明，存在一定的熔化速率范围，可以最大程度地缩短局部凝固时间，并且对于650mm直径的铸锭而言，300至400kg / h的熔化速率被认为是足够的。发现CaF_2-Al_2O_3-CaO炉渣系统中CaF_2含量的增加降低了炉渣的粘度，并且具有高CaF_2含量，即具有低粘度的炉渣用于工业规模生产。通过本研究中获得的最佳ESR条件，通过VIM-ESR双熔体工艺成功生产了最小偏析的650mm直径706合金锭。

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