Abstract
In the process of alloy melting and vacuum pouring, the impurity S element will inevitably be introduced into the nickel-base superalloys, which will cause adverse effects on the microstructure and properties of the cast nickel-base superalloys. In this paper, the research progress of S element in cast nickel-base superalloys is summarized. The effects of S element on the microstructure are described in detail from experimental researches and first-principles. The reasons for the grain boundary embrittlement caused by S atom are discussed, and the authors wish to provide some references for the better development of cast nickel-base superalloys.
Highlights
The development of new generation of aero-engines with high thrust-weight ratio requires hot components with higher properties
It is inevitable to introduce impurity elements into superalloy during melting and vacuum pouring. The content of these impurity elements is low, they can still have an adverse effect on the high temperature performance, thereby deteriorating the service performance of the hot components
The content of S in the second generation single crystal alloy CMSX-4 produced by Cannon-Muskegon is controlled within 2 ppm, the S content of the third generation single crystal alloy CMSX-4 Plus is controlled within 0.5 ppm [1]
Summary
The development of new generation of aero-engines with high thrust-weight ratio requires hot components with higher properties. Nickel-base superalloys are widely used in hot components such as aero-engine blade due to their excellent high temperature mechanical properties. The content of these impurity elements is low, they can still have an adverse effect on the high temperature performance, thereby deteriorating the service performance of the hot components. With the increasing requirements for the service performance of superalloy components, the content of impurity elements, especially S element, is strictly controlled at home and abroad. The authors wish to reveal the key mechanism of S element, optimize the control methods of S content, and provide reference for realizing the comprehensive balance of cost and performance in key components
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