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Simulation of Microstructure for Hot Pack-Forging of a High Nb Containing TiAl Alloy
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Simulation of Microstructure for Hot Pack-Forging of a High Nb Containing TiAl Alloy
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National Fundamental Research Program of China (Project No. 2011CB605502)

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    摘要:

    利用Deform-3D軟件對高鈮TiAl合金包套鍛造過程中的微觀組織演變進(jìn)行模擬。為得到模擬所需參數(shù)，在1100~1250 ℃和 0.001~0.5 s-1的條件下對合金進(jìn)行了熱壓縮試驗(yàn)。在所得試驗(yàn)數(shù)據(jù)的基礎(chǔ)上，利用一種間接方法建立了合金的動態(tài)再結(jié)晶模型，并利用Avrami形式的方程對再結(jié)晶分?jǐn)?shù)進(jìn)行描述。采用Cingara硬化模型及所建立的再結(jié)晶分?jǐn)?shù)模型構(gòu)建了合金的流變應(yīng)力本構(gòu)模型。模擬結(jié)果顯示，由于鍛造過程中摩擦的存在、熱量的損失以及簡單單向鐓粗變形的鍛造方式，使得坯料中的微觀組織分布不均勻。通過模擬結(jié)果與實(shí)驗(yàn)結(jié)果的比較，證明所建立的有限元模型能夠有效地預(yù)測高鈮TiAl合金在包套鍛造過程中的組織演變

    Abstract:

    The Deform-3D software was employed to describe the microstructure evolution of a high Nb containing TiAl billet (Ti-42Al-8Nb-0.2W-0.1Y) during its hot pack-forging. To obtain the simulation parameters, hot compression tests were performed at temperatures of 1100~1250 °C and strain rates of 0.001~0.5 s-1. Dynamic recrystallization model was developed by using an undirected method, and the recrystallized volume fraction was described by an Avrami-type equation. The constitutive model of the flow stress of the alloy was established based on Cingara hardening equation and the dynamic recrystallization model. The simulated results indicate an inhomogeneous distribution of grain structure occurs due to friction, heat loss and single direction upsetting operation in forging process. The microstructure evolution of the present alloy during pack-forging is validated by comparing the simulated results with that of the experimental data. The result indicates that the implemented microstructure module can be effectively used to predict the microstructure evolution of the high Nb containing TiAl alloy during pack-forging

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程 亮,常 輝,唐 斌,寇宏超,李金山. Simulation of Microstructure for Hot Pack-Forging of a High Nb Containing TiAl Alloy[J].稀有金屬材料與工程,2014,43(1):36~41.[Cheng Liang, Chang Hui, Tang Bin, Kou Hongchao, Li Jinshan. Simulation of Microstructure for Hot Pack-Forging of a High Nb Containing TiAl Alloy[J]. Rare Metal Materials and Engineering,2014,43(1):36~41.]
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  • 收稿日期:2013-01-25
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  • 在線發(fā)布日期: 2014-04-16
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