This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effect of Dendrite Arm Spacing on Mechanical Properties of Aluminum Alloy Cylinder Heads and Engine Blocks
Technical Paper
2005-01-1683
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In our previous work we studied the factors that affect dendrite arm spacing of cylinder heads in various aluminum alloys. The present paper will be focused on mechanical properties of cylinder heads and engine blocks of aluminum alloys with different dendrite arm spacing.
Before evaluating the DAS effect on mechanical properties, some factors have been taken into account such as the response of mechanical properties to aging of different production castings having different DAS, and the influence of dimension and weight of real products on the heat treatment and mechanical properties. Comparisons were done among various production castings with the same alloy composition (in particular the Fe content), the same modification grade and similar percentage and size of porosity Furthermore, specimens were cut from different castings with the same alloy, then the same heat treatment cycle was performed on dissected specimens instead of the whole cylinder head or engine block, in order to avoid the interference of dimension and weight of real castings.
The results on the production castings of A356 alloy with a T6 heat treatment condition show that the UTS and percent elongation were increased in a great extent with reducing in DAS, while the yield strength was found to remain unaffected by DAS. For different cylinder heads in 319 alloy without heat treatment and cooled naturally in air both UTS and YS were found to decrease with increasing DAS, but elongation and HB remained constant as DAS increased from 20 to 30 μm. In heat treatment conditions of cylinder heads and engine blocks in 319 alloy, castings with lower DAS have higher tensile properties in the range of aging temperature from 150°C to 230°C. The study on production castings with a peak-age T6 heat treatment shows that both ultimate tensile strength and yield strength were increased as DAS decreased.
Recommended Content
Authors
Topic
Citation
Zhang, B., Garro, M., Leghissa, M., Giglio, A. et al., "Effect of Dendrite Arm Spacing on Mechanical Properties of Aluminum Alloy Cylinder Heads and Engine Blocks," SAE Technical Paper 2005-01-1683, 2005, https://doi.org/10.4271/2005-01-1683.Also In
Lightweight Castings and Aluminum Alloys for Advanced Automotive Applications
Number: SP-1948; Published: 2005-04-11
Number: SP-1948; Published: 2005-04-11
References
- Flemings M.C. Kattamis T.Z. Bardes B.P. “Dendrite Arm Spacing in Aluminium Alloys” AFS Transactions 99 1991 501 506
- Spear R.E. Gardner G.R. “Dendrite Cell Size” AFS Transactions 71 1963 209 215
- Oswalt K.J. Misra M.S. “Dendrite arm spacing (DAS): a non destructive test to evaluate tensile properties of premium quality aluminium alloy (Al-Si-Mg) castings” AFS Transactions 88 1980 845 862
- Rhadhakrishna K. Seshan S. Seshadri M.R. “Dendrite Arm Spacing in Aluminium Alloy Castings” AFS Transactions 88 1980 695 702
- Rhadhakrishna K. Seshan S. “Dendrite arm spacing and mechanical properties of aluminium alloy castings” Cast Metals 2 1989 34 38
- Zhang B. Garro M. Tagliano C. “Dendrite arm spacing in aluminum alloy cylinder heads produced by gravity semi-permanent mold” Metallurgical Science and Technology 1 21 2003 3 9 SAE World Congress March 8-11 2004 Detroit, Michigan USA
- DasGupta R. DasGupta S. Brown G. “Factors affecting tensile properties of castings” SAE paper # 2004-01-1021 2004 In Advances in Lightweight Automotive Castings and Wrought Aluminum Alloys SAE International SP-1838 95 101 Warrendale, PA 15096-0001, USA
- Zhang B. et al. “Modification of GAS9C1 aluminum alloy with strontium” Internal report 12-2003 Teksid Aluminum
- Boileau J.M. Collins P.C. Allison J.E. “The effect of solidification time and heat treatment on the tensile and fatigue properties of a cast 319 aluminum alloy” Proc. 5 th Int. Conf. on Molten Aluminum processing Orlando, Florida 1988 158 172 Pub. Amer. Foundrymen's Society
- Cloutier C. Allison J. Jones J.W. “The effect of copper level and solidification rate on the aging behavior of a 319-type cast aluminum alloy” SAE paper # 2000-01-0759 2000 SAE International Warrendale, PA
- Boileau J.M. Zindel J.W. Allison J.E. “The effect of solidification time on the mechanical properties in a cast A356-T6 aluminum alloy” SAE paper # 970019 1997 SAE International Warrendale, PA
- Campbell J. Castings Butterworth-Heinemann Ltd, Linacre House Jordan Hill, Oxford OX2 8DP 1991
- Samuel A. Samuel F “A metallographic study of porosity and fracture behavior in relation to the tensile properties in 319.2 end chill castings” Met. Trans. A. 26A 1995 2359
- Meyer P. Massinon D. Guerin P. “Influence of microstructure on the static and thermal fatigue properties of 319 alloys.” SAE Paper # 970705 1997 SAE International Warrendale, PA