TC4钛合金间歇式真空渗氮工艺研究  

Research on Intermittent Vacuum Nitriding Process for TC4 Titanium Alloy

作　　者：张纯[1] 刘静[1] 李远会[2] 李坤茂[1] 潘大超 

机构地区：[1]贵州师范大学材料与建筑工程学院,贵州贵阳550001 [2]贵州大学材料与冶金学院,贵州贵阳550003

出　　处：《热加工工艺》2017年第12期171-174,共4页Hot Working Technology

基　　金：国家自然科学基金(51574096,51464008);贵州省科学技术基金(黔科合LH字[2014]7047号);贵州省科技计划(重大基础研究项目)(黔科合JZ字[2014]2003)

摘　　要：为了改善TC4钛合金的表面硬度,在氮气为正压和负压条件下对其进行间歇式真空渗氮处理。通过X射线衍射、自动维氏硬度测试和电化学极化曲线分析了不同压力下渗氮层的相结构、组织、显微硬度和耐蚀性。结果表明,TC4钛合金经真空渗氮处理后,表层均可获得由TiN_(0.3)、TiN、Ti_3AlN和Al_3Ti等相组成的改性层。在负压下,表层中氮化物数量较少,但渗层较厚,硬度梯度平缓。在正压时,表层氮化物数量增多,渗层厚度及硬度却降低。氮化后的TC4钛合金耐蚀性提高。In order to improve the surface hardness of TC4 titanium alloy, the intermittent vacuum nitriding treatment under the conditions of nitrogen for the positive pressure and negative pressure was carried out. The phase structure, microstructure, mierohardness and corrosion resistance of the infiltration layer under different pressures were analyzed by X-ray diffraction, automatic vickers hardness test and electrochemical polarization curve methods. The results show that after vacuum nitriding treatment, the modified layer with the composition of TIN0.3, TiN, Ti3A1N and AI3Ti phases on the surface of TC4 titanium alloy can be obtained. Under negative pressure, the nitride quantity in the surface layer is less, but the carbonitriding layer is thicker, and the hardness gradient is gentle. Under positive pressure, the nitride quantity in surface layer increases, and the thickness and hardness of the carbonitriding layer decrease. The corrosion resistance of TC4 titanium alloy after nitriding increases significantly.

关 键 词：TC4钛合金 间歇式真空渗氮 压力 硬度 耐蚀性 

分 类 号：TG156.82[金属学及工艺—热处理]