發(fā)布時(shí)間：2018-06-05 08:27

  本文選題：Ti-Al-.V管 + 織構(gòu)演變��； 參考：《稀有金屬材料與工程》2017年11期

【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(guò)織構(gòu)演變分析其變化規(guī)律。通過(guò)EBSD方法研究了Ti-3Al-2.5V管軸向拉伸過(guò)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(kāi)始變形時(shí)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(guò)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(jiǎn)化的CSR-f(織構(gòu)量化參數(shù))模型。與實(shí)驗(yàn)結(jié)果的對(duì)比表明,改進(jìn)模型與實(shí)驗(yàn)值符合得較好。
[Abstract]:Anisotropy is an important property of titanium alloy tubes, which is usually described by shrinkage strain ratio (CSR) macroscopically. The texture evolution of Ti-3Al-2.5V tube during axial stretching was studied by EBSD method, and the relationship between CSR and texture evolution was revealed. The results show that, with the increase of axial plastic strain, the base axis of 偽 phase crystal of titanium alloy tube gradually deflects to the circumferential direction from the beginning of deformation, and then stabilizes at the position of about 45 擄. In addition, the 尾 -phase also showed an obvious preferred orientation during the axial tensile process. It is precisely because of the texture change that the CSR decreases rapidly, then slowly, and finally tends to stabilize. The simplified CSR-f (texture quantization parameter) model is improved considering the axial component of the basic axis orientation of the 偽 -phase dense hexagonal unit cell. The comparison with the experimental results shows that the improved model is in good agreement with the experimental results.
【作者單位】： 西北工業(yè)大學(xué)凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：Key Program Project of the Joint Fund of Astronomy and National Natural Science Foundation of China(U1537203) National Science Fund for Excellent Young Scholars of China(51222509) National Natural Science Foundation of China(51175429)
【分類號(hào)】：TG146.23

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本文編號(hào)：1981334