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首页> 外文会议>International Symposium on Superalloy 718 Derivatives:Energy, Aerospace, and Industrial Applications >Mechanical Performance of Various INCONEL 740/740H Alloy Compositions for Use in A-USC Castings
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Mechanical Performance of Various INCONEL 740/740H Alloy Compositions for Use in A-USC Castings

机译：各种Inconel 740 / 740H合金组合物的机械性能，用于A-USC铸件

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The use of Ni-based superalloys as structural components of advanced ultra-supercritical steam and CO_2 turbines is becoming necessary due to the increasing performance requirements of future power plant designs. Although numerous Ni-based superalloys can respond to the demanding mechanical performance, very few present a combination of high-strength and creep resistance while maintaining good ductility and weldability. Furthermore, the improved performance is often associated with wrought alloys while the fabrication of large castings is the primary target for those applications. With the comparatively lower mechanical properties of cast alloys, new designs based on compositional changes are necessary to allow for the use of Ni-based superalloys in A-USC castings. This lack of performance is primarily associated with the large and inhomogeneous grain size as well as elemental segregation and other casting anomalies. This investigation presents various alloys with compositions within the range of INCONEL 740/740H designed to overcome the issues associated with the use of Ni-based super-alloys in A-USC castings. Modifications to the chemistry were based on thermo-dynamic simulations and experimental results. Particular attention was given to reactive element additions, element partitioning, γ' precipitate phase promoting elements and grain boundary carbides. The effects of the various compositional changes on the tensile and creep properties of INCONEL 740/740H will be discussed.
机译：使用Ni的高温合金作为先进的超超临界蒸汽和CO_2涡轮机的结构部件，由于未来发电厂设计的性能要求增加，成为必要。虽然许多基于Ni的高温合金可以响应要求的机械性能，但极少呈现高强度和蠕变电阻的组合，同时保持良好的延展性和可焊性。此外，改进的性能通常与锻造合金相关，而大铸件的制造是这些应用的主要目标。随着铸造合金的相对较低的力学性能，基于组成变化的新设计是必要的，以允许在USC铸件中使用基于Ni的超合金。这种缺乏性能主要与大型和不均匀的晶粒尺寸以及元素隔离和其他铸造异常相关联。本研究介绍了旨在克服在U-CUS铸件中使用基于Ni的超合金相关的问题相关的问题，在Inconel 740 / 740H范围内具有组合物的各种合金。对化学的修改是基于热动力模拟和实验结果。特别注意反应元件添加，元件分配，γ'沉淀相促进元件和晶界碳化物。将讨论各种组成变化对840 / 740H的拉伸和蠕变性质的影响。

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