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Microstructure, mechanical, and electrical properties of the pure copper tubes processed by hydro-assisted tube pressing (HATP) as a new severe plastic deformation method

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Abstract

The hydro-assisted tube pressing (HATP) process is a new severe plastic deformation method that is proposed in this paper to improve the mechanical properties of long tubes. The pressured fluid between the tube and die eliminates the friction force between the tube and die and, thereby, decreases the required forming force. This facilitates the production of high-strength relatively long tubes. In the current study, this process was applied to a commercial pure copper tube during six passes at room temperature. Then, the hardness, tensile and electrical properties, and also microstructure of the samples were investigated. With increasing the number of passes, the grain size of the copper tube decreased. After two passes of the HATP process, the values of yield strength and ultimate tensile strength increased from 150 and 223 MPa to 347 and 366 MPa, respectively, and the total elongation decreased from 32 to 10%. After four passes, the tube hardness significantly increased from 81 to 132 HV, and a homogeneous distribution of hardness was obtained along with the tube thickness. The electrical conductivity of the copper tube decreased by 3% after two passes. Also, the effective plastic strain and the required processing force were investigated using the Abaqus commercial finite element software. It is concluded that the required force and the strain distribution are independent of the tube length. The hydro-assisted tube pressing method potentially can be used in the industrial production of long tubes with high mechanical strength and electrical conductivity.

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Abbreviations

ɛ :

Strain

σ :

Stress

R :

Average radius of the tube

Φ :

Channel angle

Ψ :

Angle of the channel corner

K :

Deformation ratio

t :

Tube thickness

L :

Tube length

P cr :

Critical punch buckling load

E :

Young’s modulus

I :

Second moment of area

L p :

Punch length

SD :

Standard deviation

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Authors and Affiliations

  1. Department of Mechanical Engineering, Babol Noshirvani University of Technology, Shariati Ave, 47148-71167, Babol, Iran

    Ali Asghar Zolfaghari-Darzi, Hamid Gorji & Mohammad Bakhshi-Jooybari

  2. Department of Materials Engineering, Babol Noshirvani University of Technology, Shariati Ave, 47148-71167, Babol, Iran

    Roohollah Jamaati

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  1. Ali Asghar Zolfaghari-Darzi
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  2. Hamid Gorji
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  3. Mohammad Bakhshi-Jooybari
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  4. Roohollah Jamaati
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All authors contributed equally to this work.

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Correspondence to Hamid Gorji.

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Zolfaghari-Darzi, A.A., Gorji, H., Bakhshi-Jooybari, M. et al. Microstructure, mechanical, and electrical properties of the pure copper tubes processed by hydro-assisted tube pressing (HATP) as a new severe plastic deformation method. Int J Adv Manuf Technol 118, 3161–3182 (2022). https://doi.org/10.1007/s00170-021-08129-5

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