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Ti-3Al-2.5V鈦合金管織構(gòu)演變規(guī)律研究
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西北工業(yè)大學(xué)材料學(xué)院凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室,西北工業(yè)大學(xué)材料學(xué)院凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室,西北工業(yè)大學(xué)材料學(xué)院凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室,西北工業(yè)大學(xué)材料學(xué)院凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室

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國家自然科學(xué)基金和航天先進(jìn)制造技術(shù)研究聯(lián)合基金重點(diǎn)支持項(xiàng)目 (U1537203), 中國國家優(yōu)秀青年基金 (51222509), 中國國家自然科學(xué)基金 (51175429)


Texture development of Ti-3Al-2.5V titanium alloy tubes
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State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University,State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University,State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University,State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University

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Key Program Project of the Joint Fund of Astronomy and National Natural Science Foundation of China (Project U1537203), the National Science Fund for Excellent Young Scholars of China (51222509), the National Natural Science Foundation of China (51175429)

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    摘要:

    各向異性是鈦合金管的一種重要性能，宏觀上通常用收縮應(yīng)變比（CSR）進(jìn)行描述，而在微觀上則可以通過織構(gòu)演變分析其變化規(guī)律。本文通過EBSD方法研究了Ti-3Al-2.5V管軸向拉伸過程中的織構(gòu)演變，揭示了CSR與織構(gòu)演變的內(nèi)在聯(lián)系。結(jié)果表明，隨著軸向塑性應(yīng)變的增加，鈦合金管α相晶體的基軸從開始變形時的沿徑向分布逐漸朝著周向方向偏轉(zhuǎn)，然后穩(wěn)定在與徑向成45°左右的位置。另外，β相在軸向拉伸過程中也表現(xiàn)出了明顯的擇優(yōu)取向。正是因?yàn)榭棙?gòu)的變化導(dǎo)致了CSR先迅速減小，然后緩慢減小，最后趨于穩(wěn)定的變化規(guī)律。考慮到α相密排六方晶胞的基軸取向在軸向上的分量，改進(jìn)了簡化的CSR- f （織構(gòu)量化參數(shù)）模型。與實(shí)驗(yàn)結(jié)果的對比表明，改進(jìn)模型與實(shí)驗(yàn)值符合得較好。

    Abstract:

    The anisotropy, which is one of key mechanical properties of Ti-alloy tubes, is usually described in terms of the contractile strain ratio (CSR) macroscopically and dependent on the micro texture evolution. In order to understand the variation of CSR, the texture evolution of Ti-3Al-2.5V titanium alloy tubes is studied by Electron Back-Scattered Diffraction (EBSD). The results show that the basal poles of the α-phase inclined from the radial direction to circumferential direction and stabilized around 45° between these two directions, and the strongly preferred orientation of the β-phase was observed with the increase of axial plastic strain. This change of texture causes the CSR values to decrease rapidly in the initial stage, then decrease slowly until stabilizing in the final stage. The simple model between CSR and texture quantity parameter f is modified by incorporating the texture component in the axial direction. Comparison with experiment shows that the modified model is in better agreement with the experimental values than the simple model.

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李志欣,詹梅,郭坤,皇濤. Ti-3Al-2.5V鈦合金管織構(gòu)演變規(guī)律研究[J].稀有金屬材料與工程,2017,46(11):3169~3175.[Li Zhixin, Zhan Mei, Guo Kun, Huang Tao. Texture development of Ti-3Al-2.5V titanium alloy tubes[J]. Rare Metal Materials and Engineering,2017,46(11):3169~3175.]
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  • 收稿日期:2016-03-25
  • 最后修改日期:2016-07-28
  • 錄用日期:2016-08-17
  • 在線發(fā)布日期: 2017-12-12
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