Abstract
It is known that among numerous factors, industrial turbine Inlet gas Temperature (TIT, hereafter) has greatest influence on thermal efficiency of industrial gas turbine. In order to achieve higher thermal efficiency, TIT has already reached as high as 1500°C, which has been realized owing to improvement and development of cooling configuration and materials for hot parts. On the other hand, to operate gas turbines soundly, it is necessary to evaluate metal temperature of hot parts precisely. So, metal temperature evaluation methods of Ni base superalloy were investigated and developed based on coarsening phenomenon of γ' phase and carbide particles.
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