利用彩色金相法研究了TMCP(Thermal-Mechanical Control Process)工艺生产的超高强度船体海洋工程钢中马氏体/奥氏体(M/A)在等温过程、连续冷却过程和回火时的演变特点。结果表明M/A的形态尺寸与分布主要取决于组织转变的温度,加长转变...利用彩色金相法研究了TMCP(Thermal-Mechanical Control Process)工艺生产的超高强度船体海洋工程钢中马氏体/奥氏体(M/A)在等温过程、连续冷却过程和回火时的演变特点。结果表明M/A的形态尺寸与分布主要取决于组织转变的温度,加长转变的时间长只对0.5μm以下微粒状M/A略有影响。冷却速度低于2℃/s时会形成尺寸在2μm以上较大的M/A,对钢的韧性有损害。另外,回火过程中尤其是600℃以上回火时,M/A的总量明显减少,M/A球团化趋势明显,M/A个体尺寸有明显增大,对钢的韧性起到破坏作用。展开更多
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 4...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℃).展开更多
文摘利用彩色金相法研究了TMCP(Thermal-Mechanical Control Process)工艺生产的超高强度船体海洋工程钢中马氏体/奥氏体(M/A)在等温过程、连续冷却过程和回火时的演变特点。结果表明M/A的形态尺寸与分布主要取决于组织转变的温度,加长转变的时间长只对0.5μm以下微粒状M/A略有影响。冷却速度低于2℃/s时会形成尺寸在2μm以上较大的M/A,对钢的韧性有损害。另外,回火过程中尤其是600℃以上回火时,M/A的总量明显减少,M/A球团化趋势明显,M/A个体尺寸有明显增大,对钢的韧性起到破坏作用。
文摘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℃).
