Fatigue crack growth behaviour of a gamma-titanium-aluminide alloy prepared by casting and powder metallurgy

被引：35
|
作者：
Gloanec, AL
Hénaff, G
Bertheau, D
Belaygue, P
Grange, M
机构：
[1] ENSMA, CNRS, UMR 6617, Mecan & Phys Mat Lab, F-86961 Futuroscope, France
[2] TURBOMECA, F-64511 Bordes, France
[3] SNECMA MOTEURS, Dept Mat & Procedes, F-77550 Moissy Cramayel, France
来源：
SCRIPTA MATERIALIA | 2003年 / 49卷 / 09期
关键词：
titanium aluminides; microstructure; fatigue crack propagation; casting; powder consolidation;
D O I：
10.1016/S1359-6462(03)00482-2
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The fatigue crack growth behaviour of a Ti-48AI-2Cr-2Nb alloy prepared by two different processing routes, namely casting and powder metallurgy (PM), is examined. The lamellar microstructure of the cast alloy exhibits a higher resistance than the fine equiaxed gamma grain microstructure of the PM alloy when tested at R = 0.1. Crack closure effects are lower in the PM alloy than in the cast alloy, due to smoother fracture surfaces. However, after crack closure correction, this alloy still presents the lower resistance, including in the near-threshold regime. (C) 2003 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
引用
收藏
页码：825 / 830
页数：6
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