Effect of stress relief temperature and cooling rate on pressure vessel steel welds

摘要: Abstract The compositions of the matrices welds in a pressure vessel steel have been determined by atom probe tomography after series stress relief treatments. weld had bulk composition Fe–0.29 at.% Cu–1.69 Mn–0.54 Ni–0.69 Si–0.25 Mo–0.08 Cr–0.38 C–0.022 P–0.017 S and was characterized as-welded state, treatments 24 h at 650 °C, 610 °C, 100 580 °C followed slow cooling to room temperature 650 °C 610 °C fast temperature. Lower temperatures slower material from both reduce copper level matrix should lead less embrittlement during service nuclear reactor.