Factors Affecting Toughness and Corrosion Resistance of AA6082 Forgings

Shih, Teng Shih; Lin, Sung Ta; Hwang, Lih Ren

doi:10.1007/s11665-020-05424-2

Cited by 1 publication

(7 citation statements)

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“…Four tensile bars were manufactured with an equal distance along the central line of the forging blocks. Effective strain of the forged blocks was calculated according to previous work and varied from 0.3 to 1.35 for HF50 and from 1.05 to 1.4 for HF62 [ 23 ].…”

Section: Resultsmentioning

confidence: 99%

“…Forging at a high compression loading produces a large plastic deformation in the matrix. The HF50 or RF50 bar samples experienced an effective strain of more than 1.34 during forging [ 23 ]. AA7075 alloys also contain high amounts of Zn and Mg alloys, so the stacking fault energy and dislocation movement change.…”

Section: Resultsmentioning

confidence: 99%

“…The tensile tests were carried out using an Instron-8801 machine with a strain rate of 0.00042 s −1 . Details for preparing samples after the tensile tests for optical micrography (OM), energy-dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM) refer to Reference [ 23 ]. The microstructure was observed in the Y-Z plane for the forged blocks.…”

Section: Methodsmentioning

confidence: 99%

“…Potentiodynamic polarization tests were conducted on different samples in a 3.5 wt.% NaCl solution, and the results were recorded by using an Autolab PGSTAT30 Potentiostat (Artisan Technology Group, Champaign, IL, USA). The conditions that were used for running the potentiodynamic polarization test are described in Reference [ 23 ].…”

Section: Methodsmentioning

confidence: 99%

“…This results in a high tensile strength, but less elongation. Forging at a low temperature or room temperature increases elongation by 16% and toughness by 10% [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Factors Affecting the Microstructure, Tensile Properties and Corrosion Resistance of AA7075 Forgings

2021

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AA7075 alloys are high strength alloys and are used as an important material for making engineering parts. Forged AA7075 alloys showed significantly decreased toughness when the material was hot deformed at a high temperature. This study investigated the effects of forging parameters on the tensile properties and the microstructure of AA7075 forgings. The tensile properties and corrosion resistance of different forgings were determined to be correlated with their microstructures. The experiment annealed and hot-deformed sample bars at 633 K, cold-deformed them at room temperature (RF), and at sub-zero temperatures (CF). After T73 heat treatment, the microstructures depended on the deformation temperature. This varied significantly, from elongated grains for hot-forged samples to equiaxial grains for cold-deformed samples. The hot-deformed samples had a tensile strength of 592 MPa for UTS, 538 MPa for YS, and 13.4% for elongation. These were stronger but less elongated than the cold-deformed samples. All hot-deformed (HF), RF, and CF samples exhibited mechanical properties that exceeded UTS > 505 MPa, YS > 435 MPa, and an elongation > 13%, and showed moderate corrosion resistance if samples were in contact with a 3.5 wt.% NaCl solution. The toughness of the forgings could be significantly improved by decreasing the forging temperatures. The corrosion resistance of AA7075-T73 forgings was affected by the total grain boundary (GB) lengths per unit area and the 2nd phase particle counts per unit area. Increasing the high-angle grain boundary lengths (HAGBs) per unit area accelerated corrosion and increased the Icorr value.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…This results in a high tensile strength, but less elongation. Forging at a low temperature or room temperature increases elongation by 16% and toughness by 10% [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations