Global strength is a significant item for floating production storage and offloading(FPSO) design, and steel weight plays an important role in the building costs of FPSO. It is the main task to consider and combine th...Global strength is a significant item for floating production storage and offloading(FPSO) design, and steel weight plays an important role in the building costs of FPSO. It is the main task to consider and combine these two aspects by optimizing hull dimensions. There are many optional methods for the global strength analysis. A common method is to use the ABS FPSO Eagle software to analyze the global strength including the rule check and direct strength analysis. And the same method can be adopted for the FPSO hull optimization by changing the depth. After calculation and optimization, the results are compared and analyzed. The results can be used as a reference for the future design or quotation purpose.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
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
基金the sponsors of this project: American Bureau of Shipping
文摘Global strength is a significant item for floating production storage and offloading(FPSO) design, and steel weight plays an important role in the building costs of FPSO. It is the main task to consider and combine these two aspects by optimizing hull dimensions. There are many optional methods for the global strength analysis. A common method is to use the ABS FPSO Eagle software to analyze the global strength including the rule check and direct strength analysis. And the same method can be adopted for the FPSO hull optimization by changing the depth. After calculation and optimization, the results are compared and analyzed. The results can be used as a reference for the future design or quotation purpose.
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℃).
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。
