本文關(guān)鍵詞：鈦合金循環(huán)置氫組織與性能研究　出處：《合肥工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鈦合金 循環(huán)熱氫處理 氫脆 第一性原理 密度泛函

【摘要】：鈦合金具有比強(qiáng)度大、耐腐蝕性好、高溫性能可靠等優(yōu)點(diǎn),在航空航天領(lǐng)域得到廣泛的應(yīng)用。但是鈦合金室溫塑性差,變形抗力較大,制約了其冷態(tài)成形的發(fā)展。因此絕大部分鈦合金需要在高溫下成形,對(duì)模具和成形設(shè)備要求較高,加大了制造成本,限制了鈦合金的應(yīng)用。鈦合金的熱氫處理技術(shù),把氫當(dāng)作臨時(shí)合金化元素,借助氫致相變、氫致塑性、可逆合金化等特性來改變鈦合金的熱加工性能。但是熱氫處理技術(shù)主要集中于單一道次的置氫處理,而關(guān)于多道次的循環(huán)熱氫處理研究在國(guó)內(nèi)外尚屬空白。本文對(duì)Ti6Al4V合金進(jìn)行多道次循環(huán)置氫處理,利用金相顯微鏡、X射線衍射儀、熱重分析儀等手段,結(jié)合室溫壓縮試驗(yàn),對(duì)循環(huán)熱氫鈦合金的顯微組織和力學(xué)性能進(jìn)行了系統(tǒng)研究。利用M-200型摩擦磨損試驗(yàn)機(jī)對(duì)不同氫含量的Ti6Al4V合金進(jìn)行摩擦磨損試驗(yàn),以研究氫含量對(duì)鈦合金摩擦磨損性能的影響規(guī)律。采用第一性原理方法構(gòu)建了不同氫濃度的aTi-H晶體體系,研究了不同氫含量下,aTi-H體系的結(jié)構(gòu)、能量、能帶結(jié)構(gòu)、電子態(tài)密度的變化規(guī)律。試驗(yàn)結(jié)果表明：一道次置氫鈦合金極限變形率增加了17.67%,室溫塑性的增強(qiáng)得益于鈦合金內(nèi)β相的增多。而多道次循環(huán)置氫導(dǎo)致鈦合金發(fā)生氫脆,促進(jìn)了組織內(nèi)氫化物的生成,并且伴隨著置氫次數(shù)的增加,針狀α馬氏體的數(shù)量減少,α”馬氏體增多。壓縮后的循環(huán)置氫試樣晶粒彎曲并得到一定程度細(xì)化,α”體積分?jǐn)?shù)增大,未發(fā)現(xiàn)剪切帶的形成。氫使鈦合金的摩擦系數(shù)降低,但是氫含量對(duì)Ti6Al4V合金摩擦系數(shù)的影響不明顯。隨氫含量的增加,鈦合金的耐磨性能逐漸變差。隨著氫含量的增加,鈦合金的氧化磨損特征逐漸變?nèi)?磨粒磨損所起的作用逐漸增強(qiáng)。Ti-H晶胞的體積和體積膨脹率隨著氫含量的升高而增大,發(fā)生了晶格畸變,晶胞結(jié)構(gòu)不穩(wěn)定,更易生成鈦氫化合物。晶胞的穩(wěn)態(tài)能量和雜質(zhì)形成能隨著氫含量的增大而減小。純Ti晶體的能帶結(jié)構(gòu)圖表現(xiàn)出典型的金屬導(dǎo)體能帶特質(zhì),能帶在費(fèi)米能級(jí)的周圍密集分布,具有典型的金屬性。置氫后鈦原子之間的部分成鍵力降低,存在弱鍵效應(yīng)。
[Abstract]:Titanium alloy has many advantages, such as large specific strength, good corrosion resistance, reliable high temperature performance and so on. It has been widely used in the field of aerospace. However, the plasticity of the titanium alloy at room temperature is poor and the deformation resistance is large, which restricts the development of cold forming. Therefore, most of the titanium alloy needs to be formed at high temperature, higher requirements for mould and forming equipment, increased manufacturing cost, and restricted the application of titanium alloy. The hot hydrogen treatment technology of titanium alloy takes hydrogen as a temporary alloying element, and changes the hot working property of titanium alloy by virtue of hydrogen transformation, hydrogen induced plasticity and reversible alloying. However, the thermal hydrogen treatment technology is mainly concentrated on the single channel hydrogen treatment, and the study of multipass cyclic hydrogen treatment is still blank at home and abroad. In this paper, Ti6Al4V alloy was treated by multi pass cycle hydrogen treatment. The microstructure and mechanical properties of the recycled hot hydrogen titanium alloy were systematically studied by means of metallographic microscope, X ray diffractometer, thermogravimetric analyzer and room temperature compression test. The friction and wear tests of Ti6Al4V alloy with different hydrogen content were carried out by using M-200 friction and wear tester to study the effect of hydrogen content on the friction and wear properties of titanium alloy. The aTi-H crystal system with different hydrogen concentration was constructed by first principles method. The structure, energy, band structure and electronic state density of aTi-H system under different hydrogen content were studied. The experimental results show that the ultimate deformation rate of a secondary hydrogen titanium alloy increases by 17.67%, and the increase of the plastic properties at room temperature is due to the increase of the beta phase in the titanium alloy. However, the hydrogen embrittlement of titanium alloy is promoted by multipass cycle hydrogenation, and the formation of hydrides is promoted. With the increase of hydrogenation times, the number of needle like alpha martensite decreases and the "alpha" martensite increases. The grain size of the specimen after compression is refined to a certain extent, and the volume fraction of alpha increases, and the formation of the shear band is not found. The friction coefficient of the titanium alloy is reduced by hydrogen, but the effect of hydrogen content on the friction coefficient of Ti6Al4V alloy is not obvious. With the increase of hydrogen content, the wear resistance of the titanium alloy gradually decreases. With the increase of hydrogen content, the oxidation wear characteristics of the titanium alloy gradually become weaker, and the effect of abrasive wear is gradually enhanced. The volume and volume expansion rate of the Ti-H cell increases with the increase of hydrogen content, and the lattice distortion occurs, the structure of the cell is unstable, and the titanium hydride is more easily generated. The steady state energy and impurity formation energy of the cell decrease with the increase of hydrogen content. The band structure diagram of pure Ti crystal shows typical metal conductor band characteristics, which can be closely distributed around the Fermi level and has typical metallicity. The bonding force between the titanium atoms is reduced and the weak bond effect exists after hydrogen placement.
【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】：2015
【分類號(hào)】：TG146.23

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