Highly reliable heat resistant materials based on clarification of dynamic precipitation mechanism of harmful phase

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It is necessary for pipes of thermal power plants to resist steam with high temperature and pressure for several tens of years. However, harmful precipitates form after operating of power plants for several years, leading to degradation of materials. Changes of number density and size of harmful precipitates during using of pipes were investigated. It was clear that the formation of harmful precipitates was pronounced after about six years. Applied stress due to the steam with high temperature and pressure promoted the formation of harmful precipitates.