Analysis of fatigue crack initiation and S-N response of model cast aluminium piston alloys

被引：33

作者：

Mbuya, Thomas O. ^{[1
]}

Sinclair, Ian ^{[1
]}

Moffat, Andrew J. ^{[1
]}

Reed, Philippa A. S. ^{[1
]}

机构：

[1] Univ Southampton, Engn Mat Grp, Sch Engn Sci, Southampton SO17 1BJ, Hants, England

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 24期

关键词：

Cast aluminium; Piston alloys; Crack initiation; Fatigue; Intermetallics; Casting defects; INTERMETALLIC PHASES; GROWTH-BEHAVIOR; LIFE; MECHANISMS; INCLUSIONS; POROSITY; A356-T6; MICROSTRUCTURE; PARTICLES; DEFECTS;

D O I：

10.1016/j.msea.2011.06.007

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Fatigue crack initiation and S-N fatigue behaviour of hipped model Al7Si-Sr and Al0.7Si piston alloys have been investigated after overaging at 260 degrees C for 100 h to provide a practical simulation of in-service conditions. The results show that hipping did not affect the S-N behaviour of Al7Si-Sr. This is attributed to the lack of significant change in porosity distribution in this alloy because of its low porosity levels even in the unhipped state. However, hipping profoundly improved the fatigue performance of alloy Al0.7Si due to the significant reduction in porosity. In this investigation, it was observed that porosity was rendered impotent as a fatigue crack initiator in both hipped alloys. Instead, fatigue cracks were observed to originate mainly from intermetallic particles (particularly the Al9FeNi phase) in both alloys and sometimes from oxide particles in Al0.7Si alloy. Fatigue cracking was also frequently observed at intermetallic clusters in hipped Al0.7Si. The observed scatter in fatigue life is discussed in terms of the size of fatigue crack initiating particles and the overall particle size distribution which follows a power law distribution function. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：7331 / 7340

页数：10

共 51 条

[1]

BARNES SJ, 2002, SAE T

[2]

BISCHOFBERGER U, 1991, KEY ENG MATER, V44, P333

[3]

Boileau J. M., 1997, SAE, P61, DOI 10.4271/970019<original-structure ref = info:doi/10.4271/970019></original-structure>

[4] Experimental study of porosity and its relation to fatigue mechanisms of model Al-Si7-Mg0.3 cast Al alloys [J].

Buffière, JY ;

Savelli, S ;

Jouneau, PH ;

Maire, E ;

Fougères, R .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2001, 316 (1-2) :115-126

[5]

Campbell J, 1998, ADVANCES IN ALUMINUM CASTING TECHNOLOGY, P225

[6] Fatigue variability in Al-Si cast alloys [J].

Casellas, D ;

Pérez, R ;

Prado, JM .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 398 (1-2) :171-179

[7] The effect of hot isostatic pressing on the fatigue behaviour of sand-cast A356-T6 and A204-T6 aluminum alloys [J].

Ceschini, L. ;

Morri, A. ;

Sambogna, G. .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2008, 204 (1-3) :231-238

[8] Characterisation of intermetallic phases in multicomponent Al-Si casting alloys for engineering applications [J].

Chen, C. L. ;

West, G. ;

Thomson, R. C. .

ALUMINIUM ALLOYS 2006, PTS 1 AND 2: RESEARCH THROUGH INNOVATION AND TECHNOLOGY, 2006, 519-521 :359-364

[9] The combined use of EBSD and EDX analyses for the identification of complex intermetallic phases in multicomponent Al-Si piston alloys [J].

Chen, C-L ;

Thomson, R. C. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2010, 490 (1-2) :293-300

[10] Development of near-eutectic Al-Si casting alloys for piston applications [J].

Edwards, WM ;

Thomson, RC ;

Barnes, SJ ;

Barnes, SI .

ALUMINUM ALLOYS 2002: THEIR PHYSICAL AND MECHANICAL PROPERTIES PTS 1-3, 2002, 396-4 :625-630

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