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Experimental and numerical investigations of the γ' and γ' precipitation kinetics in Alloy 718

机译:718合金中γ“和γ'析出动力学的实验和数值研究

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摘要

Predictive simulations of the γ′ and γ″ precipitates in the nickel-based superalloy Alloy 718 is needed for integrated computational materials engineering of technical components. But so far, no thermo-kinetic model is published for this alloy that is capable of reproducing simultaneously the precipitation evolution during, both, short and long time aging durations for an extended range of temperatures. The thermo-kinetic modeling was performed in the software package MatCalc, which uses the classical nucleation theory, the Svoboda-Fischer-Fratzl-Kozeschnik growth model and the ‘generalized broken bond theory’ for the interfacial energy. A combination of atom probe tomography, electron microscopy, small angle neutron scattering and sequential tensile tests are conducted to obtain the unknown kinetic evolution and strengthening parameters at the nano-, micro- and macro-scales for the model. The role of the physical association of the γ′ and γ″ precipitates and the effects of the precipitation strengthening are discussed. The resulting parametrized model successfully reproduces the measured local chemical composition, volume fractions, mean radii and precipitation strengthening contributions within a single set of model parameters up to 800 °C. Between 800 °C and 830 °C the model slightly over-predicts the kinetics.
机译:镍基高温合金718中γ'和γ''析出物的预测模拟对于技术组件的集成计算材料工程而言是必需的。但是到目前为止,还没有公开该合金的热动力学模型,该模型能够在扩展的温度范围内的短时和长时效时效过程中同时再现析出。热动力学建模是在软件包MatCalc中进行的,该软件包使用经典的成核理论,Svoboda-Fischer-Fratzl-Kozeschnik生长模型和用于界面能的“广义断裂键理论”。进行了原子探针层析成像,电子显微镜,小角度中子散射和顺序拉伸试验的组合,从而获得了模型的纳米,微米和宏观尺度的未知动力学演化和​​强化参数。讨论了γ'和γ''沉淀物的物理缔合作用以及沉淀强化作用。生成的参数化模型可以在高达800 C的一组模型参数内成功地再现所测得的局部化学成分,体积分数,平均半径和沉淀强化。在800°C至830°C之间,模型会稍微高估动力学。

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