Applications of superplastic forming and diffusion bonding to hollow engine blades

被引:99
作者
Xun, YW [1 ]
Tan, MJ [1 ]
机构
[1] Nanyang Technol Univ, Sch Mech & Prod Engn, Singapore 639798, Singapore
关键词
engine blade; sandwich structure; superplastic forming; diffusion bonding; Ti-6Al4V alloy; bonding ratio;
D O I
10.1016/S0924-0136(99)00377-5
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The practical application of technology based on superplastic forming combined with diffusion bonding (SPF/DB) to advanced aircraft engine blade manufacturing is investigated in this paper. Four-sheet hollow engine blades, a Ti-6Al-4V sandwich structure, have been fabricated through the SPF/DB process after determining the design dimensions and deformation procedures. Some novel designs and special auxiliary techniques have been developed to facilitate the superplastic SPF/DB process. The finished blades can meet the property and profile demands, particularly in the boundary region (the leading and the trailing). The effects of the microstructure on the SPF/DB process were discussed. Slight grain growth was observed after the thermal exposure. Tensile tests show a strength reduction of 30% from the as-received sheets to the formed sheets. The microstructures at the interfaces indicate that a bending ratio of 100% can be reached in most bonding areas. Low bonding ratios in some regions such as cell corners and triple angles were unavoidable. The bonds present in the blade structures can be divided into four types, based on their formation quality characteristics. The distribution in thickness and bonding ratio within a formed cell were investigated, revealing two deformation localization zones and a poor-bonding area. Further processing of the formed structures involves electric spark machining and surface polishing. (C) 2000 Published by Elsevier Science S.A. All rights reserved.
引用
收藏
页码:80 / 85
页数:6
相关论文
共 21 条
[1]  
EBERHARDT A, 1980, PHILOS MAG A, V41, P843, DOI 10.1080/01418618008243892
[2]  
Fitzgerald G. A., 1986, P 1 INT C TIT PROD A
[3]  
FRIEDRICH HE, 1991, INT C SUP ADV MAT IC, P601
[4]  
GARMONG G, 1975, METALL TRANS A, V6, P1269, DOI 10.1007/BF02658537
[5]   MECHANICAL-BEHAVIOR AND HARDENING CHARACTERISTICS OF A SUPERPLASTIC TI-6AL-4V ALLOY [J].
GHOSH, AK ;
HAMILTON, CH .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1979, 10 (06) :699-706
[6]  
HAMILTON CH, 1973, SUPERPLASTIC FORMING, P621
[7]  
HASHIMOTO S, 1991, INT C SUP ADV MAT IC, P23
[8]   ORIGIN OF GRAIN-BOUNDARY MOTION DURING DIFFUSION BONDING BY HOT-PRESSING [J].
HU, W ;
PONGE, D ;
GOTTSTEIN, G .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1995, 190 (1-2) :223-229
[9]  
JI WH, 1990, MATER RES SOC SYMP P, V196, P173
[10]  
LI Z, 1991, INT C SUP ADV MAT IC, P705