激光表面复合合金化对钛合金高温性能的影响

激光表面复合合金化对钛合金高温性能的影响(论文9700字)
The effect of laser surface alloying on high temperature properties of titanium alloy
摘要
 TC4合金是国际上一种通用型钛合金，其用量占钛合金总消耗量50％左右。TC4合金是钛合金中最具代表性的材料。因此也最具有研究价值。TC4合金具有良好的低温性能，可制作在-196°C下使用的低温容器。但是随着工业技术的不断发展，对钛合金的使用工作环境要求不断提高。传统的钛合金的一些突出弱点如硬度低，耐磨性差，特别是高温下易氧化限制了其应用范围。钛合金的抗氧化性能主要取决于在服役条件下表面能否形成致密的保护性氧化膜。当工作温度超过600°C时，TC4钛合金中含有6％左右的铝不足以在表面形成连续致密的Al2O3氧化膜，氧化时形成由多孔的TiO2为主的氧化膜，抗氧化能力差。
 本次设计的题目是激光表面复合合金化对钛合金高温性能的影响，文中主要研究利用激光表面合金化技术在TC4合金表面制备Ti-Al-Nb-Si合金化层，利用合金化层在高温氧化环境中形成具有保护性的氧化膜来改善TC4合金的抗高温氧化性和摩擦磨损性，以此来提高TC4合金在高温环境下的使用性能。

关键词：TC4；钛合金；材料；性能

Abstract
TC4 alloy is a universal international titanium alloy, the total consumption which accounts for about 50% titanium. TC4 titanium alloy is the most representative of the material. Therefore, most research value. TC4 alloy has good low temperature performance, can be made at -196 ° C cryogenic vessels under use. However, with the continuous development of industrial technology, the use of titanium work environment increasing demands. Some prominent weaknesses of traditional titanium alloys such as low hardness, poor wear resistance, especially at high temperatures easily oxidized limits its scope of application. Antioxidant properties of titanium alloys depends mainly on the conditions of service under a dense protective oxide film surface can be formed. When the temperature exceeds 600 ° C, about 6% of the aluminum alloy contains insufficient TC4 Al2O3 oxide film on the surface of a dense continuous formation of a porous TiO2-based oxide film formed oxidation, antioxidant capacity is poor.
    The topic is the impact of design laser surface alloying of high-temperature properties of composite titanium, the paper mainly studies using laser surface alloying technology in the preparation of the surface of TC4 alloy Ti-Al-Nb-Si alloy layer, the use of alloyed layer at high temperatures protective oxide film formed in oxidizing environment to improve high temperature oxidation resistance and friction wear resistance TC4 alloy TC4 alloy in order to improve performance in high temperature environments.
 
Keywords：TC4 ,Location, Clamping, Process

目 录
摘要    I
Abstract    II
1绪论    1
  1.1激光复合合金化工艺的制定原理及方法    1
  1.2激光表面合金化涂层组织特性与性能    2
  1.3激光表面复合合金化国内外的发展现状    4
  1.4本课题研究的主要内容    5
2激光表面合金化层的综合分析    6
  2.1激光合金化存在的问题    6
3 激光合金化技术的发展前景及研究方向    7
4 激光表面合金化层的物相结构与组织分析    9
5 激光表面合金化层的抗高温氧化性能分析    11
6 激光表面合金化层的高温摩擦学特性分析    13
  6.1高温摩擦学的定义    14
  6.2高温摩擦的背景    16
  6.3高温摩擦磨损实验及试验机    18
  6.4影响高温摩擦系数的因素    19
结论    20
致谢    21
参考文献    22