Improving the high-temperature creep strength of 15Cr ferritic creep-resistant steels at temperatures of 923–1023 K

The precipitation strengthening of creep-resistant 15Cr ferritic steels at temperatures of 923–1023 K was improved by nickel addition. The addition of nickel, an austenite-stabilizing element, enhanced the formation of martensitic grains in the ferritic grain boundaries and changed the precipitation behavior during creep at elevated temperatures. The precipitates produced in the creep-ruptured 15Cr steels were intermetallic compounds (Laves...