【摘要】：鈦及鈦合金具有高的比強(qiáng)度、淬透性、延展性、耐腐蝕性及耐高溫性能,是一種非常重要的新型金屬結(jié)構(gòu)材料,廣泛應(yīng)用于航空航天、能源、冶金、軍事、醫(yī)療、化工以及海洋石油開(kāi)采等方面。但是鈦合金的耐磨性能較差,極大地限制了鈦合金應(yīng)用范圍。鋯具有低的密度和良好的耐腐蝕性、耐磨性、抗輻射誘發(fā)蠕變以及適中的力學(xué)性能。為了改善鈦合金的力學(xué)性能,通過(guò)添加Zr元素設(shè)計(jì)了一系列的新型Ti Zr Al V合金,這些合金都擁有優(yōu)異的力學(xué)性能。其中Ti-20Zr-6.5Al-4V是最優(yōu)組成,本文以Ti-20Zr-6.5Al-4V合金作為研究對(duì)象,研究了熱處理工藝以及熱變形參數(shù)對(duì)Ti-20Zr-6.5Al-4V合金的組織及力學(xué)性能的影響,以便通過(guò)控制熱處理工藝和熱變形參數(shù)得到期望的合金性能。結(jié)果表明,Ti-20Zr-6.5Al-4V鈦合金經(jīng)850~1000?C固溶處理后得到一種α?+β的雙相組織,隨著固溶溫度的升高,α?相的含量逐漸減少,其尺寸也不斷的變小,β相晶粒尺寸不斷增大。固溶處理時(shí),α?相首先從晶界析出,時(shí)效處理過(guò)程中發(fā)生α?→β以及β→α相轉(zhuǎn)變。Ti-20Zr-6.5Al-4V鈦合金經(jīng)過(guò)固溶處理后其抗壓強(qiáng)度和壓縮收縮率較高,屈服強(qiáng)度較低,時(shí)效處理后其真屈服強(qiáng)度顯著提高,其真抗壓強(qiáng)度略有提高,而其壓縮收縮率明顯減小。Ti-20Zr-6.5Al-4V鈦合金經(jīng)過(guò)不同冷卻速率、變形量和變形溫度的處理后的組織由α相和β相兩相組成。隨變形溫度的升高,α相的尺寸增加,隨冷卻速率的增大,α相的含量不斷減少,變形抑制了β→α相的轉(zhuǎn)變。隨著冷卻速率和變形量的增大,合金的硬度增加。
[Abstract]:Titanium and titanium alloys have high specific strength, hardenability, ductility, corrosion resistance and high temperature resistance, are a very important new type of metal structural materials, widely used in aerospace, energy, metallurgy, military, medical, Chemical and offshore oil extraction and other aspects. However, the wear resistance of titanium alloy is poor, which greatly limits the application range of titanium alloy. Zirconium has low density and good corrosion resistance, wear resistance, radiation induced creep resistance and moderate mechanical properties. In order to improve the mechanical properties of titanium alloys, a series of new Ti Zr Al V alloys were designed by adding Zr elements. These alloys have excellent mechanical properties. Ti-20Zr-6.5Al-4V is the optimal composition. In this paper, the effects of heat treatment and thermal deformation parameters on the microstructure and mechanical properties of Ti-20Zr-6.5Al-4V alloy were studied. In order to obtain the desired properties of the alloy by controlling the heat treatment process and the hot deformation parameters. The results showed that Ti-20Zr-6.5Al-4V titanium alloy was treated with 850U 1000C solution to obtain a kind of dual phase structure of 偽? 尾. With the increase of solution temperature, 偽? The content of phase decreases gradually, and the size of 尾 phase becomes smaller, and the grain size of 尾 phase increases. In solution treatment, 偽? The phase first precipitated from grain boundary, and the 偽-尾 and 尾-偽 phase transition occurred during aging treatment. The compressive strength and compression shrinkage of Ti-20Zr-6.5Al-4V titanium alloy were higher and the yield strength was lower after solution treatment. After aging treatment, the true yield strength increased significantly, the true compressive strength slightly increased, and the compression shrinkage decreased obviously. The Ti-20Zr-6.5Al-4V titanium alloy was cooled at different cooling rates. The microstructure after the treatment of deformation amount and deformation temperature is composed of 偽 phase and 尾 phase. With the increase of deformation temperature, the size of 偽 phase increases, and the content of 偽 phase decreases with the increase of cooling rate. The hardness of the alloy increases with the increase of cooling rate and deformation.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TG166.5

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 A.B.Talele ,沈新元;最佳的變形參數(shù)[J];國(guó)外紡織技術(shù)(化纖、染整、環(huán)境保護(hù)分冊(cè));1994年06期

2 周翔海;杜娟;;軟土地基承載力特征值及變形參數(shù)的研究[J];重慶科技學(xué)院學(xué)報(bào)(自然科學(xué)版);2011年02期

3 胡政;劉佑榮;武尚;易威;王康;;高地應(yīng)力區(qū)砂巖在卸荷條件下的變形參數(shù)劣化試驗(yàn)研究[J];巖土力學(xué);2014年S1期

4 林新;復(fù)合巖石變形參數(shù)的計(jì)算公式及試驗(yàn)驗(yàn)證[J];中州煤炭;1987年04期

5 彭建飛;簡(jiǎn)單載荷作用下梁的變形參數(shù)模擬課件制作[J];江蘇廣播電視大學(xué)學(xué)報(bào);2005年03期

6 李林;礦山廢石場(chǎng)散體變形參數(shù)(E、μ)計(jì)算模型的改進(jìn)[J];四川冶金;1999年01期

7 吳伯杰;陳森燦;何舒星;;TC11鈦合金高溫流動(dòng)特性及熱變形參數(shù)對(duì)組織影響的試驗(yàn)研究[J];鍛壓技術(shù);1992年02期

8 李維樹(shù),周火明,王復(fù)興;確定工程巖體宏觀變形參數(shù)的方法探討[J];巖石力學(xué)與工程學(xué)報(bào);2001年S1期

9 劉杰;李建林;張玉燈;朱婷;楊?yuàn)檴?李映霞;;循環(huán)載荷下巖體能量特征及變形參數(shù)分析[J];巖石力學(xué)與工程學(xué)報(bào);2010年S2期

10 徐勝利;黨杰;;管材無(wú)芯彎曲變形參數(shù)分析計(jì)算[J];熱加工工藝;2011年15期

相關(guān)會(huì)議論文 前3條

1 石崇;畢衛(wèi)國(guó);王秀菊;;正交各向異性動(dòng)力變形參數(shù)的靜力等效計(jì)算[A];現(xiàn)代爆破理論與技術(shù)——第十屆全國(guó)煤炭爆破學(xué)術(shù)會(huì)議論文集[C];2008年

2 侯學(xué)淵;劉國(guó)彬;;軟土卸荷變形參數(shù)及工程應(yīng)用[A];中國(guó)土木工程學(xué)會(huì)第七屆土力學(xué)及基礎(chǔ)工程學(xué)術(shù)會(huì)議論文集[C];1994年

3 李仁平;陳福全;;對(duì)沉降計(jì)算中變形參數(shù)的幾點(diǎn)思考[A];第九屆全國(guó)巖土力學(xué)數(shù)值分析與解析方法討論會(huì)論文集[C];2007年

相關(guān)重要報(bào)紙文章 前1條

1 王新禧;電影變形特效輕松實(shí)現(xiàn)[N];中國(guó)電腦教育報(bào);2003年

相關(guān)博士學(xué)位論文 前1條

1 張萍;高拱壩地基綜合變形參數(shù)計(jì)算及加固優(yōu)化研究[D];武漢大學(xué);2010年

相關(guān)碩士學(xué)位論文 前1條

1 段靜利;熱處理工藝和熱變形參數(shù)對(duì)Ti-20Zr-6.5Al-4V合金組織與性能的影響[D];燕山大學(xué);2015年

，

本文編號(hào)：2393283