Residual Stresses and Cracks in Forgings of Heat-treatable Aluminium Alloys

Luštinec, Jan; Očenášek, Vladivoj

doi:10.21062/ujep/347.2019/a/1213-2489/mt/19/4/637

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…It is then necessary to assess individually whether the damage to the forging die, and consequently the transfer of a particular type of defect to the forging, disqualifies the product, either by making it impossible to carry out further technological operations or by failing to meet the quality requirements. The location of the crack and the attempt to assess its effect on the product is also successfully applied in other manufacturing techniques [25][26]. However, when it comes to die forging, often from the initiation of a crack to the decision to scrap the forging tools, they may work effectively for quite a number of cycles, which is strongly connected with technological conditions in which the process is conducted.…”

Section: Discussionmentioning

confidence: 99%

Studies on a Robotised Process for Forging Steel Synchronizer Rings in the Context of Forging Tool Life

Meller¹,

Suszyński²,

Legutko³

et al. 2023

Manufacturing Technology

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This paper proposes a solution not previously used in the forging industry, which aims to reduce the proportion of arduous human labour. The concept of a prototype robotic station for hot forging includes a system that allows the selection of batch material with its heating, the execution of the process of lubrication of forging tools and the forging itself, synchronised with the feeding and removal of material using full automation, in accordance with the idea of Industry 4.0. At the same time, by increasing the repeatability of the entire forging process and changing some of its key parameters, it will be possible to influence the durability of the tools used during its implementation. In order to verify the impact of such a modified technological process on forging tool life, computer simulations of forging were performed, where the currently applied technology using hand forging was compared with a conceptual automated process.

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Section: Discussionmentioning

confidence: 99%

Studies on a Robotised Process for Forging Steel Synchronizer Rings in the Context of Forging Tool Life

Meller¹,

Suszyński²,

Legutko³

et al. 2023

Manufacturing Technology

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“…Figure 1 shows the form of a sample before and after forging. As shown in Figure 1(b), a crack defect was detected on the sample after the forging process, which occurred due to the presence of residual stress 16) .…”

Section: Forging Processmentioning

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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“…The severity of these sources of SCC cracks is then determined by the magnitude of the stress (inserted or residual) and the notching effect of the initial defect or structural notch. The occurrence of SCC cracks can be found both in steels [1,2] and in alloys of nonferrous metals [3,4,5]. SCC violation cannot be completely ruled out for pure metals, such as pure copper or pure iron [6].…”

Section: Fig 1 Partly Intergranular and Transgranular Scc Crack Of Tw...mentioning

confidence: 99%

Stress Corrosion Cracking and Copper Alloy Products

Očenášek¹,

Luštinec²

2022

Manufacturing Technology

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Stress corrosion cracking (SCC) is a common cause of structural failure. The simultaneous action of the corrosive environment and tensile stresses creates cracks that have an intercrystalline or transcrystalline character. These are cracks with a fragile morphology of the fracture surface without signs of plastic deformation in their vicinity. SCC cracks occur in several alloys. This paper focuses on copper alloys in which this type of failure occurs frequently. Examples from practice show cases where the occurrence of SCC violation was related to the conditions of use of components and their production technologies. The paper does not aim to capture all the influences associated with the occurrence of SCC failure of copper alloy products. SCC stress corrosion crackingCopper alloys Cold deformation Heat treatment Tensile stress

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Residual Stresses and Cracks in Forgings of Heat-treatable Aluminium Alloys

Cited by 6 publications

References 5 publications

Studies on a Robotised Process for Forging Steel Synchronizer Rings in the Context of Forging Tool Life

Studies on a Robotised Process for Forging Steel Synchronizer Rings in the Context of Forging Tool Life

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

Stress Corrosion Cracking and Copper Alloy Products

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