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Heat treatment effect on thermo-mechanical fatigue and low cycle fatigue behaviors of A356.0 aluminum alloy
Highlights ► TMF and LCF behaviors of A356.0 and A356.0-T6 aluminum alloys are studied. ► Mechanical and room temperature fatigue properties increase by heat treatment. ► Heat treatment is not effective on TMF lifetime of A356.0 alloy due to over-ageing. ► Heat treatment has significant effect on A356.0 under isothermal fatigue loadings.
Abstract 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 8h solution at 535°C, water quench and 3h 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.
Heat treatment effect on thermo-mechanical fatigue and low cycle fatigue behaviors of A356.0 aluminum alloy
Highlights ► TMF and LCF behaviors of A356.0 and A356.0-T6 aluminum alloys are studied. ► Mechanical and room temperature fatigue properties increase by heat treatment. ► Heat treatment is not effective on TMF lifetime of A356.0 alloy due to over-ageing. ► Heat treatment has significant effect on A356.0 under isothermal fatigue loadings.
Abstract 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 8h solution at 535°C, water quench and 3h 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.
Heat treatment effect on thermo-mechanical fatigue and low cycle fatigue behaviors of A356.0 aluminum alloy
Azadi, Mohammad (author) / Shirazabad, Mehdi Mokhtari (author)
2012-08-25
7 pages
Article (Journal)
Electronic Resource
English
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