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Multiscale Simulation of Yield Strength in Reduced-Activation Ferritic/Martensitic Steel
Chenchong Wan,Chi Zhang,Zhigang Yang,Jijun Zhao 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.3
One of the important requirements for the application of reduced-activation ferritic/ martensitic (RAFM) steel is to retain proper mechanical properties under irradiation and high-temperature conditions. To simulate the yield strength and stress-strain curve of steels during high-temperature and irradiation conditions, a multiscale simulation method consisting of both microstructure and strengthening simulations was established. The simulation results of microstructure parameters were added to a superposition strengthening model, which consisted of constitutive models of different strengthening methods. Based on the simulation results, the strength contribution for different strengthening methods at both room temperature and high-temperature conditions was analyzed. The simulation results of the yield strength in irradiation and high-temperature conditions were mainly consistent with the experimental results. The optimal application field of this multiscale model was 9Cr series (7-9 wt.%Cr) RAFM steels in a condition characterized by 0.1-5 dpa (or 0 dpa) and a temperature range of 25-500℃.
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