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The variation in microstructures and the mechanical properties of a Copper-bearing high strength ship-hull steel at different aging temperature was studied.The peak strength was obtained at the aging temperature of 450 ℃,which was attribute to the plentiful Cu precipitates and a bit of Nb(C,N).In the over-aged condition,both the partial recovery of matrix and the coarsening of Cu particles (10-60 nm) caused the loss of the yield strength (YS) and the improvement of toughness.The increase of the ultimate tensile strength (UTS) at aging temperature above 660℃ due to the formation of alloy-rich island structure transformed from the austenite phase upon cooling,and complied with the mixture law.The copper-bearing ship steel can exhibit an excellent combination of high strength and toughness while aging at 660 ℃ for 2 hours (UTS-818 MPa,YS-745 MPa,Akv-161 J at-40℃).
The variation in microstructures and the mechanical properties of a Copper-bearing high strength ship-hull steel at different aging temperature was studied. The peak strength was obtained at the aging temperature of 450 ° C, which was attribute to the plentiful Cu precipitates and a bit of Nb (C, N) .In the over-aged condition, both the partial recovery of the matrix and the coarsening of Cu particles (10-60 nm) caused the loss of the yield strength (YS) and the improvement of toughness. increase of the ultimate tensile strength (UTS) at aging temperature above 660 ° C due to the formation of alloy-rich island structure transformed from the austenite phase upon cooling, and complied with the mixture law. the copper-bearing ship steel can exhibit an excellent combination of high strength and toughness while aging at 660 ° C for 2 hours (UTS-818 MPa, YS-745 MPa, Akv-161 J at-40 ° C).