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RISS 인기검색어
- 검색키워드
- 저자 : Aykut Kentli (검색결과 2 건)
- 무료
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Performance of Novel TWO-CAP (Thin-Walled Open Channel Angular Pressing) Method on AA5083
Mehmet Şahbaz,Aykut Kentli,Hasan Kaya 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
Newly developed severe plastic deformation (SPD) method TWO-CAP was applied to AA5083 to increase its mechanicalproperties. The method was developed to obtain the structural beams which have a thin-walled open-cross section area inhigh strength to weight ratio. During the TWO-CAP process, the annealed U-profle specimens will be pressed along thespecifcally designed die channel with the help of the hydraulic press machine. After the expansion and narrowing processes,the specimen leaves the die with initial dimensions at the end of each pass. Therefore, the material gains strength, hardness,and toughness while the microstructure of the material was improved as a result of the SPD. In order to determine the efectof the TWO-CAP on the mechanical properties of the material, the hardness and tension tests were carried out on the allpassed specimens. Also, the characteristic investigations were performed on the specimens by using optical microscopy,SEM–EDS, and XRD analyses.
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Novel SPD Method: Twisted Variable Channel Angular Extrusion
Kerim Özbeyaz,Hasan Kaya,Aykut Kentli 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5
Different types of SPD techniques are applicable and have been studied by various researchers. All of them have severaladvantages and disadvantages. Equal Channel Angular Pressing (ECAP) is one of the most popular SPD techniques and isstill being developed. The aim of this paper is to improve the efficiency of ECAP process by putting forward a novel design(Twisted Variable Channel Angular Pressing (TV-CAP)) and also to achieve higher mechanical properties when comparedto conventional ECAP processes. For this purpose, a new TV-CAP die was designed by combining three different methods:ECAP, Twist Extrusion, and Direct Extrusion. The new design was able to integrate the advantages of each methodto the workpiece material. In this context, the design parameters of the TV-CAP die were first identified by finite elementanalysis (FEA) in Deform-3D. The TV-CAP die was produced according to the determined parameters and AA5083 alloywas pressed with this novel die. Hardness and tensile tests were carried out to compare mechanical properties. In addition,Optical Microscope, SEM, TEM images were taken, and XRD and EBSD analyses were carried out to examine the changesin grain structure. As a result of this experimental study, an increase of 197.3% was observed in the hardness value and anincrease of 144.7% was achieved in the tensile strength value by using the novel TV-CAP die. These results also agreed withthe effective strain values obtained from the FEA.
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