Annealing Heat Treatment Effect on the Residual Stresses in Hot-Extruded Aluminum Alloy Rods with High Cross-Sectional Reduction

Honarpisheh, Mohammad; Nazari, Farshad; Haghighi, Milad

doi:10.1007/s11223-020-00177-8

Cited by 8 publications

(5 citation statements)

References 48 publications

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“…The 6061 alloy is produced by extrusion. According to Honarpisheh et al [39] during the extrusion process, the residual stress is controlled by mechanical and thermal sources. Considering the extruded material as stacked layers, the outer layers will exert compression on those in the center, when passing from the die.…”

Section: Resultsmentioning

confidence: 99%

A correlation between microstructure and residual stress in the 6061 Al–Mg–Si alloy with different thermomechanical process

et al. 2020

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Depending on the nature of the loading during service, the level and nature of residual stress can contribute to the lower service-life of a component. In this study the internal level of the residual stress of a 6061 Al-Mg-Si alloy with different thermomechanical processes was evaluated by residual stress neutron diffraction (RSND). Commercial tempers such as T6 (peak aged) and O (annealed) were compared with the 6061 alloy after different steps of a thermomechanical processing used for the manufacturing of nuclear fuel plates, R3 and R9H60. The results showed that the lowest level of residual stress was found for the peak age, T6 condition. This was associated with the highest microhardness value (highest density of "β″ phase) and lowest grain size. The O temper was the only condition which showed compressive residual stress and the most coarsened precipitates. The nuclear thermomechanical processes, R3 and R9H60, resulted in increased level residual stress related to the T6 and showed a tensile nature in relation to its parent material (6061-O). Moreover, the RSND technique allows observing that the texture is also higher for the samples processed by the nuclear thermomechanical process due the hot rolling stage.

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Section: Resultsmentioning

confidence: 99%

A correlation between microstructure and residual stress in the 6061 Al–Mg–Si alloy with different thermomechanical process

et al. 2020

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“…After the first load, the sample was heattreated by full annealing at the same temperature with a holding time of 2.5 hours, cooled down to room temperature, and re-annealed at 250°C with an hour of holding time. The subsequent heat treatment was done to soften and eliminate residual stress which might occur during the first loading forging process 14) . The samples were cast in a stainless-steel mold with a dimension of 20 cm x 15 cm x 1.5 cm.…”

Section: Almentioning

confidence: 99%

Characteristic of AA 7075-Reinforced Nano-SiC Composites Produced by Stir-Squeeze Casting and Open Die Cold Forging as An Armor Material Candidate

Adityawardhana¹,

Syahrial²,

Adjiantoro³

2023

Evergreen

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This study presented the ballistic properties and impact strength of the aluminum alloy AA 7075-reinforced nano-SiC composites, which were produced by stir-squeeze casting and forging processes. Ballistic tests revealed that the samples met the National Institute of Justice (NIJ) Type II standard, except for samples that were not forged. The other characteristics examined were microstructural observations analyzed using optical and scanning electron microscopes. As a result of the pinning effect, the microstructure of the samples showed a decrease in grain size as the SiC content increased, except for samples with over 0.25 vf% of nano-SiC. This effect was observed in samples with and without forging. The forging process decreased grain size further, affecting ballistic and mechanical properties. The addition of 0.3 vf% nano-SiC improved the ballistic properties and impact strength, resulting in the highest impact value of 7.7 J, despite higher values of the average ballistic diameter of perforation (about 4.7 mm) and average indentation depth (about 17.22 mm) measured on this sample.

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“…As described previously, a new compound, olefin hydrocarbons, would form in the gas phase and deposit on the sample's surface during the erosion of carbon materials by hydrogen plasma. The new deposited hydrocarbon might finally affect the x-ray diffraction pattern result on the sample [32]. Moreover, at the beginning of irradiation, the temperature difference between the surface and the inside of the sample might change the residual stress of the sample and cause the distortion of crystal lattice [33].…”

Section: Effect Of Flux On Erosionmentioning

confidence: 99%

Erosion research of CX-2002U carbon composites under low-temperature high-flux hydrogen plasma

Guo

Shen³

et al. 2021

Plasma Sci. Technol.

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The net erosion yield of CX-2002U carbon fiber composites under high-flux low-temperature hydrogen plasma is investigated using a linear plasma device. It is found that the net erosion yield decreases rapidly first, and then tends to saturate with the increase of hydrogen–plasma flux. When the temperature of the sample eroded by hydrogen plasma is above 300 °C, the hybridization of electrons outside the carbon atom would change. Then the carbon atoms combine with hydrogen atoms to form massive spherical nanoparticles of hydrocarbon compounds and deposit on the surface at the flux condition of 1.77 × 1022 m−2·s−1. Under the irradiation of hydrogen plasma loaded with negative bias, the surface morphology of the matrix carbon is changed dramatically. Moreover, the energy dependence of mass loss does not increase in proportion to the increase of hydrogen–plasma energy, but reaches a peak around 20 V negative bias voltage. Based on the analysis of different samples, it can be concluded that the enhancement of energy could make a contribution to chemical erosion and enlarge the size of pores existing on the surface.

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Annealing Heat Treatment Effect on the Residual Stresses in Hot-Extruded Aluminum Alloy Rods with High Cross-Sectional Reduction

Cited by 8 publications

References 48 publications

A correlation between microstructure and residual stress in the 6061 Al–Mg–Si alloy with different thermomechanical process

A correlation between microstructure and residual stress in the 6061 Al–Mg–Si alloy with different thermomechanical process

Characteristic of AA 7075-Reinforced Nano-SiC Composites Produced by Stir-Squeeze Casting and Open Die Cold Forging as An Armor Material Candidate

Erosion research of CX-2002U carbon composites under low-temperature high-flux hydrogen plasma

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