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Z3CN20-09M steels of primary circuit piping in Daya Bay Nuclear Power Plant were studied on the microstructure evolution and fracture behaviors after thermal aging at 400°C for up to 20,000h. The impact toughness of aged materials decreases a lot with aging time, and the impact fracture features change from ductile dimples into brittle cleavages in ferrite and tearing in austenite. Nano-indentation...
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