Ti-6Al-4V合金渗硼层的组织研毕业论文.doc

郑州大学毕业设计（论文） 题 目： The research of Ti-6Al-4V alloy boronization layer of the organization 指导教师： 职称： 副教授 学生姓名： 学号： 专 业： 材料科学与工程 院（系）： 材料科学与工程学院 2012年 6 月 日  钛合金具有较低的密度、较高的比强度以及其优良的耐蚀性能等而被广泛应用于航空航天、军工、车辆工程、生物医学工程和日常生活等各个领域。但由于其耐磨性较差、硬度低等缺点而限制了其使用。而金属硼化物具有优良的耐磨性、耐蚀性等，并能显著提高金属表面硬度。因此本文着重介绍通过固体渗硼法对Ti-6Al-4V合金进行表面改性处理，从而提高其表面性能。 渗硼工艺已经在世界范围内被广泛应用与改良金属表面性能，其可分为：固体粉末渗硼、盐浴渗硼、气体渗硼等。本文所用为固体粉末渗硼方法，采用正交试验，通过采用不同温度、不同渗硼时间以及不同的渗硼剂成分组成等不同条件，以确定不同渗硼工艺对渗硼层组织的影响。 通过对材料进行金相制作，并进行金相组织观察和显微硬度测试等，发现在880℃，渗硼5h条件下有最厚的渗硼层组织，且此时硬度值较大。 关键词:　Ti-6Al-4V；渗硼层组织 Abstract Titanium alloy has low density, high intensity and its good than such as corrosion resistance performance is widely used in aerospace, military industry, vehicle engineering, biomedical engineering and daily life, and other fields. But because the wear resistance is bad, the low hardness faults and limit its use. But the metal boron carbide has excellent wear resistance, corrosion resistance, etc, and can significantly improve the metal surface hardness. So in this paper through the solid boriding method of Ti-6Al-4V alloy surface modification processing, thus improve the surface properties. Boronizing process has been in the world scope is widely used and improving the metal surface properties, it can be divided into: solid powder boriding and salt bath boriding and gas permeability boron etc. .This paper used the boronizing method for solid powder, using the orthogonal experiment, by means of different temperature, different time and different boronizing the boronizing supply agent compositions and so on the different conditions, to determine the boronizing process on different boronization layer the influence of the organization. Through to the material metallographic production, and use the optical microscope microstructure, and micro hardness on the surface of material test, found in 8800C, the boronizing 5 h condition has the