Shaped metal deposition of a nickel alloy for aero engine applications

被引:160
作者
Clark, D. [2 ]
Bache, M. R. [1 ]
Whittaker, M. T. [1 ]
机构
[1] Univ Coll Swansea, Sch Engn, Mat Res Ctr, Swansea SA2 8PP, W Glam, Wales
[2] Rolls Royce Plc, Derby DE24 8BJ, England
关键词
alloy; 718; shaped metal deposition (SMD); microstructure; aerospace components;
D O I
10.1016/j.jmatprotec.2007.10.051
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Manufacturing trials in support of shaped metal deposition (SMD) as a commercial process for the near net shape processing of aero engine components are reported. Initially, relatively simple multi-pass linear weld deposition beads employing the nickel-based polycrystalline superalloy Alloy 718 were characterized, to define the microstructural condition of the substrate and superimposed welds. Subsequently, a developmental combustion outer casing was fabricated via a hybrid-manufacturing route. This casing was formed from a forged ring with additive features, which included an internal, circumferential flange of Alloy 718, built up via an automated, high volumetric deposition rate MIG process. Under both circumstances, in the post-deposition heat-treated condition (aged but not solution heat treated), the gamma matrix contained laves micro-stringers, typically orientated parallel to the axis of epitaxy, with associated a phase precipitation. On the micro-scale, such micro-stringers were intimately associated with cracking or shrinkage porosity. Bi-axial stress fields imposed during the cooling of the large-scale casing structure appear to influence the macroscopic organisation of these weld deposition defects. (C) 2005 Elsevier B.V All rights reserved.
引用
收藏
页码:439 / 448
页数:10
相关论文
共 46 条
[1]  
[Anonymous], 1974, NIMONIC ALLOYS OTHER
[2]  
[Anonymous], [No title captured]
[3]  
ANTHONY J, 2003, DESIGN EXPT ENG SCI
[4]  
*ASM INT, 1993, HDB ASM INT, V6
[5]  
BACHE MR, 1999, INT J FATIGUE S1, V1, P69
[6]   The mechanical and microstructural characteristics of laser-deposited IN718 [J].
Blackwell, PL .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2005, 170 (1-2) :240-246
[7]  
BOUSE GK, 1989, APPL MODIFIED PHASE, P69
[8]  
BOWERS R, 1997, C P MAT SOL 97 ASM I
[9]  
Carlson R.G., 1989, MICROSTRUCTURAL CHAR, P79
[10]  
Cieslak M., 1989, SUPERALLOYS, P59, DOI DOI 10.7449/1989/SUPERALLOYS_1989_59_68