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Tensile Properties and Residual Stresses of a Diesel Cylinder Head in GAS9C1 Alloy
Technical Paper
2005-01-1692
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The objective of the present paper is to report the measures we have taken to improve the tensile properties, in particular the percent elongation, of the cylinder heads in GAS9C1 alloy. These measures include the choice of modification element, the reduction of Fe content, the improvement of heat treatment parameters in order to achieve an optimum combination of strength and ductility. Simultaneously, residual stress measurements were also performed with cylinder head castings which had undergone the different cycles of heat treatment in different furnaces.
Sodium and strontium have been used for the modification of GAS9C1 alloy which was applied for the production of diesel cylinder heads. Strontium modification has increased the alloy fluidity allowing to cast cylinder heads at lower pouring temperature than using Na modification. Higher percentage elongation was obtained with Sr modification than with Na modification. Different cycles have been tried for heat treatment of cylinder heads in order to verify the feasibility of combination of high tensile strength, hardness and elongation.
Residual stresses of cylinder heads in GAS9C1 alloy have been measured by destructive cutting method. Results show that increasing the aging temperature from 180°C to 220°C (aging time 5h) decreases the residual stress of about 30 Mpa; the aging temperature increase has a more pronounced effect on reducing residual stress than prolonging aging time from 5h to 10h at 180°C. Cylinder heads quenched in hot water (>60°C) after solution treatment and aged at a lower temperature (T6 at 180°C) can have residual stress similar to those quenched with cold water (RT about 20°C) and aged at a higher temperature (T7 at 220°C). Measurements performed on castings treated in discontinuous furnaces with manual quenching show that cylinder heads with Sr modification have lower residual stress than castings with Na modification.
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Citation
Zhang, B., Albertinazzi, M., Scotti, F., Sarietto, G. et al., "Tensile Properties and Residual Stresses of a Diesel Cylinder Head in GAS9C1 Alloy," SAE Technical Paper 2005-01-1692, 2005, https://doi.org/10.4271/2005-01-1692.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
- 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
- Heiberg G. Nogita K. Raanes M. Dons A.L. Dahle A.K. Arnberg L. “Effect of magnesium, iron and copper on eutectic solidification of hypoeutectic aluminum-silicon alloys” AFS Transactions 110 2002
- Stanzl-Tschegg S.E. Mayer H.R. Beste A. Kroll S. “Fatigue and fatigue crack propagation in AlSi7Mg cast alloys under in-service loading conditions” Int. J. Fatigue 17 2 1995 149 155
- Shabestari S.G. Miresmaeili S.M. Boutorabi S.M.A. “Effect of Sr-modification and melt cleanliness on melt hydrogen absorption of 319 aluminium alloy” J. of Mat. Sci. 38 2003 1901 1907
- Gruzleski J. E. Closset B. M. The Treatment of Liquid Aluminum-Silicon Alloys The American Foundrymen's Society, Inc. 1990
- Zhang B. et al “Summary on the modification of GAS9C1 alloy with strontium” Teksid internal report 12 12 2003
- Villeneuve C. Samuel A.M. Samuel F.H. “Role of trace elements in enhancing the performance of 319 aluminum foundry alloy” Transactions of AFS and the Proceedings of the One Hundred Fifth Annual Casting Congress April 28 May 1 2001 109 287 300
- Garro M. Zhang B. Leghissa M. Sarietto G. “Factors affecting residual stresses of cylinder heads and engine blocks in aluminum alloys.” SAE paper # 05-103 2005 SAE International Warrendale, PA