Carbide coagulation and its effect on heat resistance of ferritic steels

Investigation of the effect of carbide dispersion in low-alloyed Cr-Mo-V steels steels on their heat resistance has been carried out. Carbide coarsening rate was evaluated within the 550-700 deg C temperature range regarding particles as spherical, and additional precipitation of carbide phases does not occur in the process of creep tests. It has been established that under high-temperature creep carbide precipitates coarsening takes place along with an increase in distances between them and, hence, along with a decrease of a number of strengthening particles. Therefore, heat treatment resulting in generation of fine-dispersion carbide phase is applied to provide stable structure and properties of steels at high temperatures