钛及钛合金渗硼工艺及性能研究

发布时间：2018-03-31 02:22

  本文选题：TC4钛合金　切入点：纯钛　出处：《辽宁工程技术大学》2015年硕士论文

【摘要】：TC4钛合金是一种典型的α+β型两相钛合金,它含有6%的α相稳定元素铝和4%的β相稳定元素钒。由于钛合金的比强度高、弹性模量低、耐腐蚀性和耐热性能好,在航空航天工业中应用广泛。但随着社会经济的发展,它在应用中也暴露出许多缺点,如硬度低、耐磨性能差、微振腐蚀等。本实验分别采用固体粉末法、膏剂法对TC4钛合金进行渗硼工艺处理,确定渗硼工艺参数(渗硼温度、渗硼时间、加入定量稀土),研究不同工艺对渗层性能的影响。固体粉末法选用900℃、1000℃、1100℃三种温度作为渗硼温度,选用10h、12h、14h三种保温时间为保温时间。通过对试样进行形貌和性能分析,得到最高温度1100℃,保温12h的条件下渗层中有TiB2硬质相生成。膏剂法对TC4钛合金在850-950℃温度下进行热处理。具体温度分别定为850℃、900℃、950℃；保温时间10h、12h、14h。最终得最高温度950℃,保温10h,渗硼效果最好且随着稀土的加入渗层增厚。根据上面对TC4钛合金膏剂法的工艺设定,对纯钛进行渗硼处理,最终最高温度在950℃,保温10h为最佳渗硼工艺参数。XRD分析表明,在渗层中产生了中间化合物TiB,而且随着稀土的加入TiB的含量明显增加。单渗硼后得到的渗层硬度比基体提高了80%,耐磨性提高了30%；稀土-硼共渗后的渗层硬度比基体提高了85%,耐磨性提高了50%。
[Abstract]:TC4 titanium alloy is a typical 伪 尾 type two-phase titanium alloy, which contains 6% 伪 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，

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