發(fā)布時間：2018-03-31 02:22

  本文選題：TC4鈦合金　切入點(diǎn)：純鈦　出處：《遼寧工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：TC4鈦合金是一種典型的α+β型兩相鈦合金,它含有6%的α相穩(wěn)定元素鋁和4%的β相穩(wěn)定元素釩。由于鈦合金的比強(qiáng)度高、彈性模量低、耐腐蝕性和耐熱性能好,在航空航天工業(yè)中應(yīng)用廣泛。但隨著社會經(jīng)濟(jì)的發(fā)展,它在應(yīng)用中也暴露出許多缺點(diǎn),如硬度低、耐磨性能差、微振腐蝕等。本實(shí)驗(yàn)分別采用固體粉末法、膏劑法對TC4鈦合金進(jìn)行滲硼工藝處理,確定滲硼工藝參數(shù)(滲硼溫度、滲硼時間、加入定量稀土),研究不同工藝對滲層性能的影響。固體粉末法選用900℃、1000℃、1100℃三種溫度作為滲硼溫度,選用10h、12h、14h三種保溫時間為保溫時間。通過對試樣進(jìn)行形貌和性能分析,得到最高溫度1100℃,保溫12h的條件下滲層中有TiB2硬質(zhì)相生成。膏劑法對TC4鈦合金在850-950℃溫度下進(jìn)行熱處理。具體溫度分別定為850℃、900℃、950℃；保溫時間10h、12h、14h。最終得最高溫度950℃,保溫10h,滲硼效果最好且隨著稀土的加入滲層增厚。根據(jù)上面對TC4鈦合金膏劑法的工藝設(shè)定,對純鈦進(jìn)行滲硼處理,最終最高溫度在950℃,保溫10h為最佳滲硼工藝參數(shù)。XRD分析表明,在滲層中產(chǎn)生了中間化合物TiB,而且隨著稀土的加入TiB的含量明顯增加。單滲硼后得到的滲層硬度比基體提高了80%,耐磨性提高了30%；稀土-硼共滲后的滲層硬度比基體提高了85%,耐磨性提高了50%。
[Abstract]:TC4 titanium alloy is a typical 偽 尾 type two-phase titanium alloy, which contains 6% 偽 phase stable element aluminum and 4% 尾 phase stable element vanadium. Due to its high specific strength, low elastic modulus, good corrosion resistance and heat resistance, TC4 titanium alloy has good corrosion resistance and heat resistance due to its high specific strength, low elastic modulus, good corrosion resistance and heat resistance. It is widely used in aerospace industry. However, with the development of social economy, it also exposes many disadvantages, such as low hardness, poor wear resistance, micro-vibration corrosion and so on. The boronizing process of TC4 titanium alloy was treated by paste method, and the boronizing process parameters (boronizing temperature, boronizing time) were determined. The effect of different processes on the properties of permeating layer was studied by adding quantitative rare earth elements. Three kinds of temperature of boronizing were used as boronizing temperature of 900 鈩，

本文編號：1688741