本文關(guān)鍵詞：鈦合金高壓扭轉(zhuǎn)變形過程數(shù)值模擬研究　出處：《合肥工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： TC4鈦合金 高壓扭轉(zhuǎn) Deform-3D 數(shù)值模擬 置氫

【摘要】：鈦合金作為一種輕質(zhì)材料而被廣泛使用。高壓扭轉(zhuǎn)(high-pressure torsion,HPT)作為一種大塑性變形(severe plastic deformation,SPD)方法被廣泛應(yīng)用于各種材料的塑性加工過程中。研究鈦合金高壓扭轉(zhuǎn)變形過程,分析不同變形因素對(duì)鈦合金高壓扭轉(zhuǎn)變形過程的影響規(guī)律。對(duì)于后續(xù)鈦合金高壓扭轉(zhuǎn)實(shí)驗(yàn)的具體實(shí)施具有重要的意義。本文利用Deform-3D模擬軟件對(duì)高壓扭轉(zhuǎn)過程進(jìn)行模擬。首先利用UG造型軟件建立三維模型,然后將模型導(dǎo)入Deform-3D軟件中,從而就建立了鈦合金高壓扭轉(zhuǎn)的三維模型。通過改變鈦合金高壓扭轉(zhuǎn)變形過程中各種參數(shù),利用Deform-3D軟件對(duì)其進(jìn)行模擬,分析不同工藝因素對(duì)鈦合金高壓扭轉(zhuǎn)變形過程的影響。本文分析摩擦因子對(duì)三種典型鈦合金TA11α型鈦合金、TB6β型鈦合金、TC4α+β型鈦合金高壓扭轉(zhuǎn)變形過程中等效應(yīng)變和相對(duì)扭轉(zhuǎn)角度的影響,得到不同類型鈦合金的高壓扭轉(zhuǎn)變形規(guī)律。通過分析摩擦因子和變形溫度對(duì)TC4鈦合金高壓扭轉(zhuǎn)變形過程的影響規(guī)律,得到TC4鈦合金在高壓扭轉(zhuǎn)過程中破損系數(shù)、等效應(yīng)變、等效應(yīng)力、表面膨脹比、速度矢量的分布和變化規(guī)律。通過置氫與未置氫TC4鈦合金高壓扭轉(zhuǎn)變形過程的比較,得到置氫對(duì)TC4鈦合金高壓扭轉(zhuǎn)變形過程的影響。數(shù)值模擬結(jié)果表明:對(duì)于TA11α型鈦合金,隨著摩擦因子的增加,等效應(yīng)變先降低而后增加,相對(duì)扭轉(zhuǎn)角度先升高而后降低;對(duì)于TB6β型鈦合金,摩擦因子對(duì)其高壓扭轉(zhuǎn)變形過程中等效應(yīng)變和相對(duì)扭轉(zhuǎn)角度影響規(guī)律與TA11α型鈦合金一致;而對(duì)于TC4α+β型鈦合金,隨著摩擦因子的增加,等效應(yīng)變逐漸增加,相對(duì)扭轉(zhuǎn)角度先升高后降低最后再次升高。對(duì)于TC4鈦合金,隨著摩擦因子的增加,試樣上表面破損系數(shù)數(shù)值在0.5~0.6左右,高壓扭轉(zhuǎn)變形過程中等效應(yīng)變、表面膨脹比均增加,速度矢量的大小逐漸減小。等效應(yīng)變?cè)趶较蚝洼S向方向分布不均勻,等效應(yīng)力在徑向和軸向方向的分布較為均勻,幾乎保持在一條水平線上;隨著變形溫度的增加,試樣上表面的破損系數(shù)變化維持在0.6~0.9左右。隨著變形溫度的增加,高壓扭轉(zhuǎn)過程中等效應(yīng)變和速度矢量的大小逐漸增加,等效應(yīng)力和表面膨脹比的大小均逐漸減小。等效應(yīng)變?cè)趶较蚝洼S向方向分布不均勻,等效應(yīng)力在徑向和軸向方向分布較為均勻,幾乎保持在一條水平線上。置氫能夠改善TC4鈦合金高壓扭轉(zhuǎn)坯料的表面質(zhì)量,能夠使得變形深入到坯料內(nèi)部,并且使得變形均勻。本文模擬結(jié)果表明不同類型鈦合金材料高壓扭轉(zhuǎn)變形過程不同。摩擦因子越大越有利于高壓扭轉(zhuǎn)過程的進(jìn)行,變形溫度越高越有利于塑性變形的進(jìn)行,實(shí)際難以實(shí)現(xiàn)高溫下鈦合金的高壓扭轉(zhuǎn)過程。置氫對(duì)于鈦合金高壓扭轉(zhuǎn)過程是有益的。
[Abstract]:Titanium alloy is widely used as a light material. High pressure torsion. HPT) as a kind of large plastic deformation severe plastic deformation. SPD method is widely used in the plastic processing of various materials. The high pressure torsional deformation process of titanium alloy is studied. The influence of different deformation factors on the high-pressure torsional deformation process of titanium alloy is analyzed. It is of great significance to carry out the subsequent high-pressure torsion experiment of titanium alloy. In this paper, Deform-3D software is used to simulate the deformation of titanium alloy. The high-pressure torsion process is simulated. Firstly, the three-dimensional model is built by UG modeling software. Then the model is imported into Deform-3D software, and a three-dimensional model of high pressure torsion of titanium alloy is established. By changing the parameters of the process of high pressure torsion deformation of titanium alloy. The effects of different process factors on the high-pressure torsional deformation of titanium alloy were analyzed by Deform-3D software. The friction factors on three typical titanium alloys TA11 偽 type titanium alloy were analyzed in this paper. The effect of equivalent strain and relative torsion angle on TB6 尾 titanium alloy TC4 偽 尾 titanium alloy during high pressure torsional deformation. The effects of friction factor and deformation temperature on the high-pressure torsional deformation of TC4 titanium alloy were analyzed. The damage coefficient, equivalent strain, equivalent stress and surface expansion ratio of TC4 titanium alloy under high pressure torsion were obtained. The distribution and variation of velocity vector. The comparison of the torsional deformation process of TC4 titanium alloy with and without hydrogen insertion was carried out at high pressure. The effect of hydrogen insertion on the high pressure torsional deformation of TC4 titanium alloy is obtained. The numerical simulation results show that for TA11 偽 titanium alloy, the equivalent strain decreases first and then increases with the increase of friction factor. The relative torsion angle increased first and then decreased; For TB6 尾 titanium alloy, the effect of friction factor on equivalent strain and relative torsion angle during high pressure torsion deformation is consistent with that of TA11 偽 titanium alloy. For TC4 偽 尾 titanium alloy, the equivalent strain increases gradually with the increase of friction factor, the relative torsion angle increases first, then decreases and then rises again. For TC4 titanium alloy, the equivalent strain increases gradually with the increase of friction factor. With the increase of friction factor, the damage coefficient of the upper surface of the specimen is about 0.5 ~ 0.6, and the equivalent strain and the surface expansion ratio increase in the process of high-pressure torsional deformation. The distribution of equivalent strain is not uniform in radial and axial direction, and the distribution of equivalent stress in radial and axial direction is more uniform, and the equivalent strain is almost kept at a horizontal line. With the increase of deformation temperature, the change of the damage coefficient of the upper surface of the specimen is maintained at 0.6 ~ 0.9. With the increase of deformation temperature, the equivalent strain and velocity vector increase gradually in the process of high-pressure torsion. The magnitude of equivalent stress and surface expansion ratio decrease gradually. The distribution of equivalent strain is not uniform in radial and axial directions, and the distribution of equivalent stress is more uniform in radial and axial directions. It can improve the surface quality of TC4 titanium alloy high pressure torsion blank and make the deformation go deep into the blank. The simulation results show that different types of titanium alloy materials have different high-pressure torsional deformation process. The larger the friction factor is, the more favorable the high-pressure torsion process is. The higher the deformation temperature is, the more favorable the plastic deformation is. It is difficult to realize the high-pressure torsion process of titanium alloy at high temperature, and the hydrogen insertion is beneficial to the high-pressure torsion process of titanium alloy.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG146.23;TG306

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