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【期刊论文】Constitutive modeling for elevated temperature flow behavior of 42CrMo steel
蔺永诚
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-1年11月30日
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蔺永诚, Y.C. Lin, Jiao Deng, Yu-Qiang Jiang, Dong-Xu Wen, Guan Liu
Materials Science&EngineeringA 598(2014)251–262,-0001,():
-1年11月30日
Uniaxial tensile tests of a typical Ni-based superalloy are conducted under the deformation temperature range of 920-1010 oC and strain rate range of 0.01-0.001 1/s. The effects of initial δ phase ( ) on the hot tensile deformation behaviors and fracture characteristics are discussed in detail. The results show that: (1) For the studied Ni-based superalloy with a large amount of δ phase, the flow stress curves are composed of three distinct stages, i.e., work hardening stage, flow softening stage and the final fracture stage. (2) The initial δ phase has significant effects on the deformation behaviors of the studied superalloy. δ phase can cause the obvious work hardening at the beginning of hot deformation, and then accelerates the flow softening by promoting the dynamic recrystallization with further straining. With the increase of initial δ phase, the strain rate sensitivity coefficient decreases firstly and then increases. (3) The combined effects of localized necking and microvoid coalescence cause the final fracture of specimens. The increase of initial δ phase increases the density of nucleus for the formation of microvoids, and promotes the nucleation and coalescence of microvoids.
Ni-based superalloy, Plastic deformation, Deformation mechanism, Fracture morphology
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蔺永诚, Dong-Xu Wen, Y.C. Lin, Jian Chen, Jiao Deng, Xiao-Min Chen, Jin-Long Zhang, Min He
Materials Science&EngineeringA 620(2014)319–332,-0001,():
-1年11月30日
Hot compressive deformation behaviors of the aged nickel-based superalloy are studied under the deformation temperature range of 920-1040 oC and strain rate range of 0.001-1 1/s. Based on the experimental data, the processing maps are developed and correlated with the deformed microstructures of the studied nickel-based superalloy. The effects of initial aging time on the processing map and microstructures are discussed in detail. It is found that the processing map and microstructures are sensitive to the initial aging time. When the initial aging time is shorter than 12 h, the spherical and short needle-shaped δ phases can stimulate the occurrence of dynamic recrystallization and improve the hot workability, as well as decrease the final forging temperature of the studied nickel-based superalloy. However, when the initial aging time is increased to 24 h, the excessive long needle-shaped δ phases appear and become the potential locations of wedge cracking, which easily leads to flow instability during hot deformation. The aged superalloy under 900 oC for 9 h or 12 h is suitable for the hammer forging process. The optimum deformation parameters for hammer forging process are 1010-1040 oC and 0.1-1 1/s. The aged superalloy under 900 oC for 9 h can be used for the conventional die forging. Furthermore, the forging temperature should be controlled in the range of 980-1040 oC, and the strain rate should be lower than 0.1 1/s. The solution-treated superalloy or the aged superalloy under 900 oC for 6 h or 9 h is suitable for the isothermal die forging, and the optimum hot deformation parameters is 980-1040 oC and near 0.001 1/s.
Hot compressive deformation behaviors of the aged nickel-based superalloy are studied under the deformation temperature range of 920-1040 and strain rate range of 0., 001-1 ., Based on the experimental data,, the processing maps are developed and correlated with the deformed microstructures of the studied nickel-based superalloy., The effects of initial aging time on the processing map and microstructures are discussed in detail., It is found that the processing map and microstruct
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蔺永诚, Y.C. Lin , Y.Q. Jiang, Y.C. Xia, X.C.Zhang, H.M. Zhoud, J. Deng
Materials Science&EngineeringA605(2014)192–202,-0001,():
-1年11月30日
Creep-aging forming, combining both the aging treatment and forming process, has recently drawn much attention of researchers. In this study, the effects of creep-aging processing on the corrosion resistance and mechanical properties of a typical Al-Cu-Mg alloy are investigated by electrochemical corrosion, exfoliation corrosion and uniaxial tensile experiments. The results show that the corrosion resistance and mechanical properties of the studied Al-Cu-Mg alloy are strongly sensitive to the creep-aging processing parameters. The creep-aging processing can change the dimension and density of nanoprecipitates, which greatly affects the corrosion resistance and mechanical properties of the studied Al-Cu-Mg alloy. With the increase of creep-aging temperature, the corrosion resistance and the elongation decrease, while the yield strength and ultimate tensile strength increase. For the materials creep-aged in “under aging” and “peak aging” conditions, the applied stress can increase the ultimate tensile strength, but deteriorate the corrosion resistance.
Creep-aging, Aluminum alloy, Corrosion resistance, Mechanical property, Nanoprecipitate
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