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Effect of creep stress on the microstructure of 9-12% Cr steel for rotor materials
Jiling Dong1, Yinsheng He, Minsoo Kim
1School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401-331, China.
Abstract:
High-chromium heat-resistant steel has been widely used as the key material to improve the condition of steam pressure and temperature in the modern high-efficiency power plants. Despite the use of the steel above 550°C for several decades, its major failure is owing to the creep fracture. In this study, the effect of creep stress on the microstructure in 9-12% Cr steel has been investigated microscopically, and it is clarified that the creep stress enhances precipitation of Laves phase and influences the lath width and dislocation density in lath interior.
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