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Effect of Microstructure and Mechanical Properties of Al 3003 Alloy Weld by Stationary Shoulder Friction Stir Welding Process

Woo-Chul Jung Joo-Heon Park Sang-Min Yoon Young Kyun Kim
Archives of Metallurgy and Materials | 2023 | vol. 68 | No 1 | 113-118 | DOI: 10.24425/amm.2023.141482
Keywords Stationary shoulder friction stir welding Aluminum 3003 alloy Microstructure Mechanical properties
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Abstract

The lap joint welding of Al 3003 alloy by stationary shoulder friction stir welding (SSFSW) was performed under the conditions of tool rotation and welding speed, and it was confirmed that the welding was performed under all conditions. The tunnel defects and pores were formed in the weld zone at the lowest tool rotation and welding speed, and it is increased, the weld surface has been improved. At the same tool rotation speed at the welding speed is increased, the grain size was refined in the stir zone (SZ) and thus the hardness increased by about 14% compared to the base metal. The tensile shear strength is measured to be 10 kN or more under most conditions, and in the 4000 rpm with high heat input, the shear tensile strength was measured relatively lower than other conditions due to excessive heat input of the material.
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Authors and Affiliations

Woo-Chul Jung
1
ORCID: ORCID
Joo-Heon Park
1
Sang-Min Yoon
1
Young Kyun Kim
1
  1. Advanced Material & Processing Center, Institute for Advanced Engineering, 175-28 Goan-ro, 51 beon-gil, Yongin-si, Gyeonggi, 17180, Korea

A Study on Drilling Machinability of γ-TiAl Alloy

Hyunseok Yang Woo-Chul Jung Man-Sik Kong Changhee Lee
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 951-954 | DOI: 10.24425/amm.2021.136403
Keywords γ-TiAl alloy drilling Machinability Thrust Torque
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Abstract

Intermetallic γ-TiAl alloy has excellent properties at high temperatures and is thus attracting attention as a substitute for nickel-based superalloy parts for turbine engines. However, γ-TiAl alloy is reported to be a difficult material to be machined due to its low ductility at room temperature, tensile strength, and thermal conductivity. In this study, a system capable of measuring thrust force (Tf) and torque (Tc) during the drilling process was constructed, and drilling processability according to the heat treated microstructure of γ-TiAl alloy was compared. As a result, it was confirmed that the thrust and torque of the γ-TiAl alloy having a microstructure in which the grains were refined by the heat treatment process was relatively low and rapidly stabilized, which is advantageous for drilling.
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Bibliography

[1] M. Rahman, Y.S. Wong, A.R. Zareena, Machinability of titanium alloys, JSME Series C 46 (1), 107-115 (2003).
[2] A. Beranoagirre, G. Urbikain, A. Calleja, L. Lacalle, Drilling Process in γ-TiAl Intermetallic Alloys, Materials (Basel) 2018 Dec; 11 (12): 2379. Published online 2018 Nov 26. DOI: https://doi.org/10.3390/ma11122379
[3] S . Castellanos, A. Cavaleiro, Machinability of titanium aluminides: a review, Proceedings of the Institution of Mechanical Engineers 233, 3, 426-451. DOI: https://doi.org/10.1177/1464420718809386
[4] M. Thomas, M.P. Bacos. Processing and Characterization of TiAlbased Alloys: Towards an Industrial Scale. AerospaceLab 3, 1-11 (2011). hal-01183638
[5] J.H. Kim, J.K. Kim, S.W. Kim, Y.H Park, S.E. Kim, Effect of Microstructure Control on the Mechanical Properties of Hot Worked TiAl Alloy, Korean J. Met. Mater. 58, 7, 459-465 (2020). DOI: https://doi.org/10.3365/KJMM.2020.58.7.459
[6] S . Bhowmick, A. Alpas, Minimum quantity lubrication drilling of aluminium – silicon alloys in water using diamond-like carbon coated drills, International Journal of Machine Tools & Manufacture 48, 1429-1443 (2008).
[7] J.N. Wang, J. Yang, Q. Xia, Y. Wang, On the grain size refinement of TiAl alloys by cyclic heat treatment, Materials Science and Engineering A 329-331, 118-123. DOI: https://doi.org/10.1016/S0921-5093(01)01543-X
[8] P.C. Priarone, S. Rizzuti, G. Rotella, Tool wear and surface quality in milling of a gamma-TiAl intermetallic. International Journal of Advanced Manufacturing Technology 61, 25-33 (2012). DOI: https://doi.org/10.1007/s00170-011-3691-x
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Authors and Affiliations

Hyunseok Yang
1 2
ORCID: ORCID
Woo-Chul Jung
1
ORCID: ORCID
Man-Sik Kong
1
ORCID: ORCID
Changhee Lee
2
  1. Advanced Materials & Processing Center, Institute for Advanced Engineering, Yongin, South Korea
  2. Hanyang University, Division of Materials Science and Engineering, Seoul, South Korea

Evaluation of Electropolishing Characteristics of 316L Stainless Steel Tube in Contaminated Electrolyte

Woo-Chul Jung Hyunseok Yang Seon-Jin Choi Man-Sik Kong
Archives of Metallurgy and Materials | 2024 | vol. 69 | No 1 | 123-127 | DOI: 10.24425/amm.2024.147799
Keywords Electropolishing 316L stainless steel Electrolyte contamination Surface roughness
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Abstract

In the electropolishing process, the polishing quality of the metal surface varies according to the contamination of the electrolyte. In this study, the electrolyte was evaluated according to the usage time, and the effect of each factor on electropolishing was investigated. As the electrolyte is contaminated, the concentration of metal ions in the electrolyte increases and the ion conductivity decreases. In addition, the pH and specific gravity of the electrolyte increase due to the metal sludge formed as the metal ion concentration increases. When the electrolyte usage time was more than 5 days, many scratches remained on the surface of 316L stainless steel, and relatively high surface roughness was measured. The surface roughness improvement rate compared to the initial specimen was 30% for the unused electrolyte, 26% on the 3rd day, 19% on the 5th day, and 17.5% on the 13th day. Since the low current density due to electrolyte contamination causes a decrease in polishing efficiency, initial scratches on the metal surface still exist on the polished surface. Therefore, it is necessary to manage the electrolyte to maintain the quality of electropolishing.
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Authors and Affiliations

Woo-Chul Jung
1
ORCID: ORCID
Hyunseok Yang
1
ORCID: ORCID
Seon-Jin Choi
2
ORCID: ORCID
Man-Sik Kong
1
ORCID: ORCID
  1. Advanced Material & Processing Center (Institute for Advanced Engineering, Yongin, Korea)
  2. Division of Materials Science and Engineering, Hanyang University, Seoul, South Korea

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