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Heat treatment effect on thermo-mechanical fatigue and low cycle fatigue behaviors of A356.0 aluminum alloy

Azadi, M ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matdes.2012.08.066
  3. Publisher: 2013
  4. Abstract:
  5. In the present paper, the heat treatment effect on A356.0, a cast aluminum alloy which has been widely used in diesel engine cylinder heads, is investigated under out-of-phase thermo-mechanical fatigue and low cycle fatigue (at different temperatures) loadings. A typical heat treatment is applied to the material including 8. h solution at 535 °C, water quench and 3. h ageing at 180 °C. The experimental fatigue results show that the heat treatment process has considerable influence on mechanical and low cycle fatigue behaviors, especially at room temperature, but its effect on thermo-mechanical fatigue lifetime is not significant. The improvement in the strength can be explained by the dislocation theory. Under thermo-mechanical fatigue loadings, the difference between the fatigue lifetime of A356.0 alloy and A356.0-T6 alloy decreases when the temperature range increases. In this condition, plastic strain increases severely during the fatigue cycles in A356.0-T6 alloy due to over-ageing phenomenon and therefore, the amount of cyclic softening in heat treated alloy is more
  6. Keywords:
  7. Aluminum alloy ; Low cycle fatigue ; Thermo-mechanical fatigue ; Diesel engines ; Engine cylinders ; Heat treatment ; Cast aluminum alloy ; Cyclic softening ; Dislocation theory ; Fatigue cycles ; Fatigue lifetime ; Heat treated alloy ; Heat treatment process ; Heat-treatment effects ; Low cycle fatigue behavior ; Low cycle fatigues ; Out-of-phase thermo-mechanical fatigues ; Room temperature ; Temperature range ; Thermo mechanical fatigues (TMF) ; Water quench ; Aluminum alloys
  8. Source: Materials and Design ; Volume 45 , 2013 , Pages 279-285 ; 02613069 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S026130691200605X