胡春燕,刘新灵,陶春虎.电液束加工对DD6单晶合金气膜孔损伤行为研究[J].稀有金属材料与工程,2019,48(10):3190~3194.[huchunyan,liuxinling,taochunhu.Damage behavior of electro-stream machining on the film holes ofDD6 single crystal superalloy[J].Rare Metal Materials and Engineering,2019,48(10):3190~3194.]
电液束加工对DD6单晶合金气膜孔损伤行为研究
投稿时间:2018-04-24  修订日期:2018-06-22
中文关键词:  气膜孔  DD6单晶高温合金  电液束加工  损伤行为  原位疲劳
基金项目:航空科学基金(KZ43150734)
中文摘要:
      国内对于先进型号发动机涡轮转子单晶叶片已主要采用电液束加工。电液束加工主要是电化学阳极溶解的过程,对单晶高温合金会造成孔边材料的腐蚀损伤,进而在服役条件下影响单晶叶片的性能。采用微观观察、金相分析等研究电液束加工对单晶高温合金气膜孔的损伤行为,通过高温原位疲劳试验分析打孔损伤对疲劳裂纹萌生机制的影响。结果表明:在入口侧孔边及孔壁的腐蚀区域形貌均为DD6单晶高温合金电解腐蚀组织的特征,部分γ相被腐蚀掉,γ′相突出。入口侧孔边的电解腐蚀层厚度在15~30μm范围内,中间孔壁的电解腐蚀层厚度在6~9μm范围内;带单孔的DD6单晶高温合金试样疲劳裂纹萌生有两种情况:一是从孔边的疏松缺陷处萌生裂纹;二是从孔边的电解腐蚀损伤层附近起源。
Damage behavior of electro-stream machining on the film holes ofDD6 single crystal superalloy
英文关键词:film cooling hole  DD6 single crystal superalloy  electro-stream machining  damage behavior  in-situ fatigue
英文摘要:
      Electro-stream machining is mainly a process of electrochemical anode dissolution, which causes corrosion damage to the single-crystal material and affects the performance of the film holes under service conditions. Based on the microscopic analysis and in-situ fatigue test, the damage behavior of electro-stream machining on the film holes of DD6 single crystal superalloy were investigated. The results show that the corrosion zones of the film hole are all characteristics of electrolytic corrosion of DD6 single crystal superalloy, which a part of the γ phase is eroded and the γ′ phase is prominent. In addition, there are two ways of fatigue crack initiation of the DD6 single crystal superalloy specimen with a single hole: one is originate from the porous defect at the edge of the hole and the other is that from the electrolytic corrosion damage layer at the edge of the hole.
作者单位E-mail
胡春燕 北京航空材料研究院 fachcy@163.com 
刘新灵 北京航空材料研究院  
陶春虎 北京航空材料研究院  
摘要点击次数: 57
全文下载次数: 23
查看全文  查看/发表评论  
关闭