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一種基于等溫多塑性變形機(jī)制耦合的數(shù)值模擬方法
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A Numerical Simulation Method Based on Coupling of Isothermal Multi-Plastic Deformation Mechanism
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    摘要:

    以TC4合金等溫鍛造為例，提出一種基于多塑性變形機(jī)制耦合的數(shù)值模擬方法。通過(guò)對(duì)等溫鍛造過(guò)程中塑性變形機(jī)制的研究和對(duì)應(yīng)變速率敏感指數(shù)以及TC4合金動(dòng)態(tài)再結(jié)晶的分析，建立材料常規(guī)塑性變形、超塑性變形和蠕變變形的判據(jù)。并依據(jù)多塑性變形機(jī)制判據(jù)來(lái)確定坯料內(nèi)部各單元的實(shí)時(shí)塑性變形機(jī)制，同時(shí)采用相應(yīng)的本構(gòu)方程，使模擬結(jié)果更符合實(shí)際情況，從而能真實(shí)反映航空難變形材料的等溫鍛造工藝過(guò)程：普通塑性變形、超塑性變形和等溫保壓充填模具過(guò)程等。模擬結(jié)果表明，變形材料并非處于單一塑性變形機(jī)制，而是多種變形機(jī)制相互協(xié)調(diào)，并且隨著變形的進(jìn)行，材料各單元的變形機(jī)制也隨之改變。等溫鍛造過(guò)程中，上述機(jī)制的改變與材料的動(dòng)態(tài)再結(jié)晶密切相關(guān)

    Abstract:

    A numerical simulation method based on coupling of isothermal multi-plastic deformation mechanism was put forward with isothermal forging for Ti-6Al-4V alloy as example. By investigating the plastic deformation mechanism and analyzing the strain rate sensitivity exponent m and dynamic recrystallization (DRX) of Ti-6Al-4V alloy during isothermal forging, the criteria of common plastic deformation, superplastic deformation and creep deformation were obtained. According to the criteria of the multi-plastic deformation mechanism, the real-time plastic deformation mechanism of material elements was determined and the corresponding constitutive equation was applied. This method can make simulation result more reasonable and can truly reflect the isothermal forging process of aerial materials difficult to deform: common plastic deformation, bulk superplastic deformation and isothermal pressure holding. The simulation results show that during isothermal forging process, the three kinds of plastic deformation mechanism co-exist and the deformation mechanisms of the elements change with the deformation proceeding. And the change of plastic deformation mechanism is closely related to DRX

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蔡 軍,李付國(guó).一種基于等溫多塑性變形機(jī)制耦合的數(shù)值模擬方法[J].稀有金屬材料與工程,2011,40(5):778~783.[Cai Jun, Li Fuguo. A Numerical Simulation Method Based on Coupling of Isothermal Multi-Plastic Deformation Mechanism[J]. Rare Metal Materials and Engineering,2011,40(5):778~783.]
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  • 收稿日期:2010-05-05
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