프로젝션 용접 전극을 위한 시효경화성 Cu-2.0wt%Be 합금의 미세조직과 기계적성질

김광수; 김진용; Gwangsoo Kim; Jinyong Kim

Korean Journal of Materials Research, Vol.25, No.9, 468-474, September, 2015

DOI10.3740/MRSK.2015.25.9.468 Export Citation

프로젝션 용접 전극을 위한 시효경화성 Cu-2.0wt%Be 합금의 미세조직과 기계적성질

Microstructures and Mechanical Properties of Age Hardenable Cu-2.0wt%Be Alloy for Projection Welding Electrode

김광수^†, 김진용¹

순천향대학교 디스플레이·신소재공학과
¹코리아세미텍(주)

Gwangsoo Kim^†, and Jinyong Kim¹

Department of Materials Engineering, Soonchunhyang University Choongnam, Soonchunhyang University Choongnam, Korea
¹Koreasemitech, Kwangju 286-8, Korea

E-mail:

Evaluations of the microstructure and mechanical properties of age hardenable Cu-2.0wt%Be alloy are performed in order to determine whether it can be used as a welding electrode for projection welding. The microstructure examinations, hardness measurements, and tensile tests of selective aging conditions are conducted. The results indicate that the aging treatment with the fine-grained microstructure exhibits better hardness and high tensile properties than those of the coarsegrained microstructure. The highest hardness value and high tensile strength are obtained from the aged condition of 300 oC for 360 min due to the presence of the metastable γ .precipitates on the grain boundaries. The values of the highest hardness and tensile strength are measured as 374 Hv and 1236.2 MPa, respectively. The metastable γ . precipitates are transferred to the equilibrium γ precipitates due to the over-aged treatment. The presence of the γ precipitates appears as nodule-like precipitates decorated around the grain boundaries. The welding electrode with the best aging treated condition exhibits better welding performance for electrodes than those of electrodes used previously.

Keywords:age harenable Cu-2.0wt%Be alloy;projection welding electrode;aging treatment

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[4] Ryou M, Lee BS, Kim MH, J. Mater. Sci. Technol., 24, 120 (2008)

[5] Copper Development Association Inc, www.copper.org, Copper and Copper-Beryllium Alloy.

[6] Wilkes P, Acta Metall. Mater., 16, 153 (1968)

[7] Lu F, Dong P, Sci. Technol. Weld. Joining, 4, 285 (1999)

[8] Chatterjee KL, Waddell W, Weld. Met. Fab., 64, 110 (1996)

[9] Fukumoto S, Lum I, Biro E, Boomer DR, Zhou Y, Weld. J., 82, 307 (2003)

[10] Chan KR, Ph. D. Thesis (in English), p.14~20, University of Waterloo, Waterloo (2005).

[11] Nordstrom TV, Rohde RW, Mottern DJ, Metall. Mater. Trans. A-Phys. Metall. Mater. Sci., 6A, 1561 (1975)

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[13] Wikle KG : “Beryllium copper an overview of heat techniques, Heat treating”, ASM, July, 30 (1983).

[14] Zhang J, Perez RJ, Wong CR, Lavernia EJ, Mater. Sci. Eng., 13, 325 (1994)

[15] Monzen R, Hasegawa T, Watanabe C, Philos. Mag. Lett., 89, 75 (2009)

[16] LECO corp. Metallography Principles and Procedure, 42 (1996).

[17] Mance A, Mihajloviv A, J. Appl. Electrochem., 11, 205 (1981)

[18] Khachaturyan AG, Laughlin DE, Acta Metall. Mater., 38, 1823 (1990)