渗铝涂层对DD6单晶高温合金疲劳性能的影响  

Effect of aluminizing coating on fatigue properties of DD6 single crystal superalloy

作　　者：董建民 李嘉荣 甄真 许振华 DONG Jianmin;LI Jiarong;ZHEN Zhen;XU Zhenhua(Science and Technology on Advanced High Temperature Structural Materials Laboratory,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院先进高温结构材料重点实验室,北京100095 [2]中国航发北京航空材料研究院航空材料先进腐蚀与防护重点实验室,北京100095

出　　处：《材料工程》2025年第1期65-71,共7页Journal of Materials Engineering

基　　金：中国航发自主创新专项资金项目(ZZCX-2022-019)。

摘　　要：为研究渗铝涂层对DD6合金表面完整性和旋转弯曲高周疲劳性能的影响,采用化学气相沉积(CVD)方法在标准热处理的DD6合金疲劳试样上渗铝,采用扫描电镜(SEM)和能谱仪(EDS)分析了渗铝涂层后DD6合金试样横截面组织形貌及元素分布情况,然后分别测试未涂层和涂层后试样760℃与980℃的旋转弯曲高周疲劳性能。结果表明:渗铝涂层后试样表层区域主要分为内外两层,外层主要由β-NiAl相组成,内层为扩散层,含有较多固溶强化元素。渗铝涂层会略微降低合金760℃和980℃的旋转弯曲高周疲劳性能,但对高应力幅区的疲劳寿命影响较大,对低应力幅区的疲劳寿命影响较小。表面粗糙度差异、氧化损伤和元素互扩散等因素耦合作用是导致未涂层和涂层试样疲劳寿命差异的本质原因。To investigate the effects of aluminizing coating on the surface integrity and rotational bending high cycle fatigue performance of DD6 alloy,the chemical vapor deposition method is used to aluminize DD6 fatigue samples after standard heat treatment.The cross-sectional microstructure and elemental distribution of DD6 alloy samples with aluminizing coating are analyzed using SEM and EDS,and the high cycle fatigue properties of the uncoated and coated samples are tested at 760℃ and 980℃,respectively.The results show that the surface area of the sample with aluminizing coating is mainly divided into two layers:inner and outer.The outer layer is mainly composed of the β-NiAl phase,and the inner layer is a diffusion layer,containing many solid solution strengthening elements.The aluminizing coating can slightly reduce the rotational bending high cycle fatigue performance of the alloy at 760℃ and 980℃ and has a significant impact on the fatigue life in the high-stress amplitude region and a small impact on the lowstress amplitude region.The coupling effect of surface roughness,oxidation damage,and element interdiffusion is the fundamental reason for the difference in fatigue life between uncoated and coated samples.

关 键 词：DD6 渗铝涂层 疲劳 单晶高温合金 

分 类 号：TG172.6[金属学及工艺—金属表面处理]