Ti6Al4V合金表面无氢渗碳层分析  

Analysis of Hydrogen-Free Carburized Coating on Ti6Al4V Substrate

作　　者：姬寿长 李争显 杜继红 王少鹏 王宝云 黄春良 潘晓龙 

机构地区：[1]NW Inst Nonferrous Met Res, Ctr Corros & Protect, Xian 710016, Peoples R China

出　　处：《稀有金属材料与工程》2010年第12期2152-2156,共5页Rare Metal Materials and Engineering

摘　　要：将Ti6Al4V合金试样置入真空炉中进行无氢渗碳。分别用XRD、SEM、EDS及HV显微硬度计对渗碳层的物相、组织形貌、成分和硬度进行分析。结果表明,经过渗碳后,渗层中出现TiC相,但是未发现氢化物及含H相。整个渗碳层由附着层、渗碳层和扩渗层组成。附着层中含有Ti、Al、V元素,附着层的存在阻碍碳的渗入。渗碳层由致密的渗碳层Ⅰ和等轴晶组成的渗碳层Ⅱ组成。扩渗层有碳的渗入,碳含量少,只是一个渗碳影响层。渗层的硬度呈梯度变化,硬度变化曲线是渗层中碳含量变化的反映,硬化层厚度约为900μm。Ti6Al4V alloy specimens were put into a vacuum furnace for hydrogen-free carburization. The phases, microstructure, composition and hardness of the carburized coating were analyzed by XRD, SEM, EDS and HV hardness tester, respectively. Results show that after carburization TiC phase appears in the coating, but no hybrids or H-containing phase are observed. The total carburized coating is composed of accreted layer, carburized layer and diffusion layer. The accreted layer containing Ti, Al and V elements inhibits the permeance of carbon. The carburized layer is composed of dense layer I and equiaxed-crystal-shaped layer II. The diffusion layer has a little carbon, so it is only a carburization-influenced zone. The HV microhardness of the carburized coating has a gradient change. The change of hardness reflects the change of carbon content. The hardened layer is about 900 mu m thick.

关 键 词：TI6AL4V合金 表面 无氢渗碳 层分析 渗碳层 扩渗层 附着层 显微硬度计 碳含量 组织形貌 梯度变化 渗入 含量变化 变化曲线 真空炉 氢化物 等轴晶 层厚度 阻碍 中碳 

分 类 号：TG146.23[一般工业技术—材料科学与工程]