Ti6Al4V合金表面等电位空心阴极辉光放电W-Mo共渗层耐冲刷腐蚀性能

发布时间：2018-04-14 06:21

本文选题：TiAlV合金 + 辉光放电　；参考：《材料热处理学报》2015年S2期

【摘要】：利用针状等电位空心阴极放电技术,在低于钛合金Ti6Al4V相变温度下,对其表面进行W-Mo共渗。利用扫描电子显微镜、X射线衍射仪、显微硬度计、球-盘摩擦磨损试验仪等分析了改性层的表面及截面形貌、相组成、显微硬度;及在室温干摩擦条件下的耐磨性能;利用冲刷腐蚀试验机研究了W-Mo合金渗层在单相流和双相流冲刷腐蚀条件下,在Na Cl腐蚀介质中的耐蚀性能。结果表明:Ti6Al4V基体经过W-Mo共渗处理后,在其表面形成了厚度约为25.0μm的合金改性层。合金层由Al MoTi_2和Ti_xW_(1-x)相组成。改性层的显微硬度高达850 HV0.1,较基体(450 HV0.1)显著提高,改性层的平均摩擦系数也从基体的0.30降到0.14。W-Mo合金渗层良好的表面力学性能有效的保护了基体材料不受外力的冲刷,在单相流冲蚀下,W-Mo合金渗层的腐蚀速度只是基体Ti6Al4V的1/19;在双相流冲蚀条件下,只是基体Ti6Al4V的1/37。
[Abstract]:The surface of titanium alloy was co-infiltrated with W-Mo at the temperature below the Ti6Al4V phase transition temperature by using needle-shaped equipotential hollow cathode discharge technique.The surface and cross section morphology, phase composition, microhardness and wear resistance of the modified layer were analyzed by means of scanning electron microscope (SEM), microhardness tester, ball disk friction and wear tester, etc.The corrosion resistance of W-Mo alloy layer in NaCl corrosion medium under the condition of single-phase flow and two-phase flow erosion corrosion was studied by means of scour corrosion tester.The results showed that the alloy modified layer with thickness of 25.0 渭 m was formed on the surface of the matrix treated by W-Mo.The alloy layer consists of Al MoTi_2 and TixW _ T _ 1-x) phases.The microhardness of the modified layer is as high as 850HV0.1, which is significantly higher than that of the substrate 450HV0.1. the average friction coefficient of the modified layer is reduced from 0.30 of the matrix to the good surface mechanical properties of the 0.14.W-Mo alloy infiltration layer, which effectively protects the matrix material from external scouring.The corrosion rate of the infiltrating layer of W-Mo alloy under single-phase flow erosion is only 1 / 19 of that of the matrix Ti6Al4V, and that of the matrix Ti6Al4V is only 1 / 37 of that of the matrix Ti6Al4V under the condition of two-phase flow erosion.
【作者单位】：北京石油化工学院材料科学与工程学院;
【基金】：北京石油化工学院优秀学科带头人培育计划(BIPTBPOAL-2013)
【分类号】：TG174.4

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