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等溫變形對異種鈦合金焊縫組織性能的影響
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國家自然科學(xué)基金資助項(xiàng)目(50775187)


Influence of Isothermal Deformation Parameters on Microstructures and Properties of Welded Zone of Dissimilar Titanium Alloy
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    摘要:

    通過改變等溫變形工藝參數(shù)探討了焊縫顯微組織的變化機(jī)理與焊件的室溫拉伸性能。結(jié)果表明：在較低應(yīng)變速率下，以較大變形量變形時(shí)，焊接界面晶粒細(xì)化與位錯(cuò)切過晶界和晶內(nèi)的O/α2相條及O/α2發(fā)生拉長、頸縮而斷開的機(jī)制有關(guān)，變形量小時(shí)則主要以位錯(cuò)切斷晶界及晶內(nèi)O/α2條為主。應(yīng)變速率低(10-4 s-1)和高(10-2 s-1)時(shí)，出現(xiàn)的粗細(xì)不同條狀O/α2相是與動態(tài)再結(jié)晶的響應(yīng)速率有關(guān)。在980 ℃，以10-2～10-4 s-1應(yīng)變速率和30%～50%變形Ti2AlNb/TC11雙合金焊接接頭，可得到高于TC11合金的室溫強(qiáng)度

    Abstract:

    The evolution mechanism of the weld zone microstructure and the room temperature tensile strength of the weldment for Ti2AlNb/TC11 dissimilar alloy were investigated through changing the isothermal deformation parameters. Results show that at lower strain rate with higher deformation, the grain refinement of the welded interface is related to dislocation cutting across grain boundary and intragranlar strip O/α2-phase and elongated O/α2-phase necking down. With low deformation, the grain refinement is only related to dislocation cutting across the grain-boundaries and transgranular strip O/α2-phases. Appearance of course and fine strip O/α2-phases is related to response of dynamic recrystallization at low strain rate (10-4 s-1) and high strain rate (10-2 s-1). After hot deformation at 980 °C, at strain rate of 10-2-10-4 s-1 and deformation of 30%-50%, the room-temperature strength of the Ti2AlNb/TC11 dual-alloy joint is better than that of TC11 alloy

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周 偉,姚澤坤,譚立軍,郭鴻鎮(zhèn),張建偉,梁曉波.等溫變形對異種鈦合金焊縫組織性能的影響[J].稀有金屬材料與工程,2011,40(7):1230~1233.[Zhou Wei, Yao Zekun, Tan Lijun, Guo Hongzhen, Zhang Jianwei, Liang Xiaobo. Influence of Isothermal Deformation Parameters on Microstructures and Properties of Welded Zone of Dissimilar Titanium Alloy[J]. Rare Metal Materials and Engineering,2011,40(7):1230~1233.]
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  • 收稿日期:2010-07-11
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