Effects of solidification structure on fatigue crack growth in rheocast and thixocast Al-Si-Mg alloys

被引：6
作者：
Kim, SW [1 ]
Han, SW [1 ]
Lee, UJ [1 ]
Woo, KD [1 ]
机构：
[1] Chonbuk Natl Univ, RCIT, Div Adv Mat Engn, Jeonju 561756, South Korea
来源：
MATERIALS LETTERS | 2004年 / 58卷 / 1-2期
关键词：
casting; fatigue; eutectic solidification; strain hardening; ductile striation;
D O I：
10.1016/S0167-577X(03)00456-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fatigue crack growth test was performed for rheocast and thixocast Al-Si-Mg aluminum alloys. At small stress intensity factor range (DeltaK), fatigue crack growth (FCG) rate of sample with coarse acicular Si particles decreased slightly compared with specimen with small acicular Si particles. However, at large DeltaK, fatigue crack growth rate of specimen with coarse acicular Si particles drastically increased. This is because large acicular Si particles induce high strain hardening at small DeltaK, but such particles are easily cracked with the increase in DeltaK. Morphology of the Si particles strongly affects striation formation. (C) 2003 Published by Elsevier B.V.
引用
收藏
页码：257 / 261
页数：5
相关论文
共 13 条
[1]  
[Anonymous], 1996, Strength and Fracture of Engineering Solids
[2]   CASTING DEFECTS AND THE FATIGUE BEHAVIOR OF AN ALUMINUM CASTING ALLOY [J].
COUPER, MJ ;
NEESON, AE ;
GRIFFITHS, JR .
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, 1990, 13 (03) :213-227
[3]   EFFECT OF CRACK SURFACE GEOMETRY ON FATIGUE-CRACK CLOSURE [J].
DRURY, WJ ;
GOKHALE, AM ;
ANTOLOVICH, SD .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1995, 26 (10) :2651-2663
[4]   The debonding and fracture of Si particles during the fatigue of a cast Al-Si alloy [J].
Gall, K ;
Yang, N ;
Horstemeyer, M ;
McDowell, DL ;
Fan, JH .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1999, 30 (12) :3079-3088
[5]   Finite element analysis of the stress distributions near damaged Si particle clusters in cast Al-Si alloys [J].
Gall, K ;
Horstemeyer, M ;
McDowell, DL ;
Fan, JH .
MECHANICS OF MATERIALS, 2000, 32 (05) :277-301
[6]   Fatigue crack growth behavior in semi-liquid die-cast Al-7%Si-0.4%Mg alloys with fine effective grain structure [J].
Han, SW ;
Kumai, S ;
Sato, A .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2001, 308 (1-2) :225-232
[7]   Origin of improved ductility in semi-liquid die-cast Al-7%Si-0.4%Mg alloys [J].
Han, SW ;
Kumai, S ;
Sato, A .
MATERIALS TRANSACTIONS JIM, 2001, 42 (02) :342-349
[8]   FRACTURE-BEHAVIOR OF A112WT-PERCENT-SIO.35WT-PERCENT-MG(0-0.02)WT-PERCENT-SR CASTING ALLOYS UNDER FATIGUE TESTING [J].
LEE, FT ;
MAJOR, JF ;
SAMUEL, FH .
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, 1995, 18 (03) :385-396
[9]  
Ohnishi N., 1996, J. JFS, V68, P891
[10]   SOME CONSIDERATIONS ON FATIGUE CRACK CLOSURE AT NEAR-THRESHOLD STRESS INTENSITIES DUE TO FRACTURE SURFACE-MORPHOLOGY [J].
RITCHIE, RO ;
SURESH, S .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1982, 13 (05) :937-940
12