| Creep-fatigue load interaction strength design and life analysis technology is the significant guarantee of high temperature service component safety. Modified12%Cr steel (X12CrMoWVNbN10-1-1), as a new type of heating-resistant steel, is used in the ultra-supercritical steam rotor turbine. The mechanical behavior of this steel under the creep-fatigue interaction is very important to design and manufacture of product. With the needs of ultra-supercritical steam turbine localization technology, crack growth test of X12CrMoWVNbN10-1-1steel under creep-fatigue was investigated in this study. The main work and conclusions are as follows:(1) Considering with the absence of the crack propagation test methods under creep-fatigue interaction, existing foreign creep-fatigue crack growth test standards were compared and analyzed. An optimized test method of creep-fatigue interaction crack growth was presented. The test methods outline of the creep-fatigue interaction crack propagation was coded. A creep-fatigue crack growth test system was set up.(2)On the basic of the built creep-fatigue crack growth test system, creep-fatigue crack growth test of X12CrMoWVNbN10-1-1under600℃was studied, related crack growth rate data was obtained.(3)Basic on the creep-fatigue crack growth test data, the discipline between da/dN and△K, da/dt and Cmax*were provided. It showed that the Saxena linear superposition model can well fit the experimental data, and the relevant material parameters were got. |
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