Fatigue of an aluminium cast alloy used in the manufacture of automotive engine blocks
| Autor: | R. González, S. Valtierra, N.F. Garza-Montes-de-Oca, Rafael Colás, Alejandro González, J. Talamantes-Silva, R.D. Mercado-Solis |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Alloy chemistry.chemical_element engineering.material Microstructure Fatigue limit Industrial and Manufacturing Engineering chemistry Mechanics of Materials Casting (metalworking) Aluminium Modeling and Simulation visual_art Aluminium alloy visual_art.visual_art_medium engineering General Materials Science Composite material Refining (metallurgy) Heat treating |
| Zdroj: | International Journal of Fatigue. 54:118-126 |
| ISSN: | 0142-1123 |
| Popis: | The fatigue resistance of an aluminium alloy used for casting engine blocks was studied. The tests were carried out with specimens machined from the bulkheads of V8 engine blocks cast by the low pressure process. The samples were obtained from two different locations in the bulkheads to evaluate the effect of microstructural refining as the material was cut from regions in which the secondary dendrite arm spacing was within two different sizes, namely 30 and 45 μm. The samples were tested either in their as-cast and heat treating conditions in a computer controlled servohydraulic machine. The tests were fully reversible following staircase schedules. The specimens were fatigued to fracture or up to 107 cycles. The results show that fatigue cracks nucleate in pores located close to the surface of the specimen. It is concluded that the fatigue resistance is affected by heat treating and microstructural refining. The enhancement in fatigue resistance due to microstructural refining is documented. An analysis was carried out to predict the cycles to failure that the material is able to sustain. |
| Databáze: | OpenAIRE |
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