Service Temperature Estimation for Gas Turbine Buckets Based on Microstructure Change.
Service Temperature Estimation for Gas Turbine Buckets Based on Microstructure Change.
复制标题
基于微观结构变化的燃气轮机叶片使用温度估算。
DOI：
10.2472/jsms.45.699
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Takanari Okamura
中科院分区：
文献类型：
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作者：
Y. Yoshioka;N. Okabe;Daizo Saito;K. Fujiyama;Takanari Okamura
研究了镍基高温合金IN738LC在750~900℃温度范围内的显微组织变化，提出了预测燃气轮机叶片20000小时使用温度的新方法。 IN738LC的样品在高达24000小时的温度范围内时效以实现微观结构的变化。 IN738LC中γ'直径的增长速率与老化时间的1/3量级成正比，γ'密度与老化时间成反比。基于γ'直径和密度预测温度的准确性随着老化时间和温度的增加而增加。通过微观结构变化估算的实际使用 20000 小时的铲斗的金属温度与前缘部分的热分析一致，这是分析最可靠的点。这表明了所提出方法的可用性。
This paper studies the microstructure chage of Ni-base superalloy IN738LC in the temperature range of 750-900°C, and develops a new method of predicting the service temperature of gas turbine buckets operated for 20000hr. The specimens of IN738LC were aged in the temperature range up to 24000hr to achieve the microstructure change. The growth rate of γ' diameter in IN738LC was proportional to 1/3 order of aging time, and γ' density was inversely proportional to aging time Accuracy of the predicted temperature based on the γ' diameter and density increased with increasing aging time and temperature. The metal temperature of actual 20000hr serviced buckets estimated by the microstructure change agreed with the thermal analysis at the leading edge portion which is a most reliable point for the analysis. This shows the availability of the proposed method.