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首页> 外文期刊>Materials science forum >Thoughts on High Performance Superalloy Design and Microstructural Characteristics of a Newly Designed Ni-Cr-Co-W Superalloy Applied above 850℃
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Thoughts on High Performance Superalloy Design and Microstructural Characteristics of a Newly Designed Ni-Cr-Co-W Superalloy Applied above 850℃

机译：850℃以上应用新型Ni-Cr-Co-W高温合金的高性能高温合金设计和组织性能的思考

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摘要

With the development of aircraft engine, higher requirement was put forward on turbine disk materials. In the present work, new thoughts on improving high temperature properties of superalloys have been proposed and a newly developed candidate turbine disk material for 850°C-900°C application with a composition of Ni-Co-Cr-W superalloy has been investigated. The results show that W is beneficial for mechanical properties. Microstructural characteristics and hot deformation of this new alloy were studied by optical microscope (OM), field emission scanning electric microscope (FESEM) and energy dispersive X-ray spectrometer (EDX) and differential scanning calorimetry (DSC). The results show that the main precipitates in the as-cast condition are γ’ phase, primary MC carbides and eutectic phase. The incipient melting temperature, γ’ solvus and MC solvus are 1312°C, 1220°C and 1356°C respectively. Cracks are observed in the tested samples after hot deformed at 1160°C to 1220°C with 30% strain. They initiated at the surface of the samples and propagated along the grain boundaries and also initiated at the interface of carbides and matrix.
机译：随着飞机发动机的发展，对涡轮盘材料提出了更高的要求。在目前的工作中，已经提出了改善高温合金高温性能的新思路，并且研究了一种新开发的用于850°C-900°C应用的，具有Ni-Co-Cr-W高温合金成分的候选涡轮盘材料。结果表明，W有利于机械性能。用光学显微镜（OM），场发射扫描电镜（FESEM），能量色散X射线光谱仪（EDX）和差示扫描量热法（DSC）研究了这种新合金的显微组织特征和热变形。结果表明，铸态条件下的主要析出相为γ′相，原生MC碳化物和共晶相。初始熔融温度γ’溶解度和MC溶解度分别为1312℃，1220℃和1356℃。在1160°C至1220°C热变形30％后，在测试样品中观察到裂纹。它们起始于样品表面并沿晶界传播，也起始于碳化物与基体的界面。

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