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Recent results on hardness and microstructure evolution of two pressure vessel steel welds with different Ni content (0.29 at% Ni and 1.66 at %) but similar high Cu content (0.4 at%) during long-term thermal ageing at three temperatures (330degC, 365degC and 405degC respectively) were reported. The high Ni content steel was observed to have a much stronger hardening effect during thermal ageing. Precipitation...
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