Effect of Pulse Current on Tensile Deformation Behavior of IN718 Alloy

Abstract:

The pulse current was performed on the IN718 alloy during tensile test at room temperature and elevated temperature in the present study. The effect of pulse current on the deformation behavior of the alloy and the mechanisms were investigated. The results show that the deformation resistance decreases and the elongation increases significantly of IN718 alloy during tensile test at room temperature and 1073 K with the increase of pulse current. And the effect of pulse current on the strength and plasticity of the alloy increases as pulse current energy increases. The electroplastic effect of pulse current can promote the dislocation motion, and thus decrease the deformation resistance of the alloy during the tensile deformation. The pulse current reduces the starting temperature of recrystallization, promotes the recrystalllization nucleation, and thus makes it possible that the dynamic recrystallization would occur at lower temperature than that in the conventional temperature field. This is the main reason for the decrease of deformation resistance and the increase of plastic deformation ability of IN718 alloy under pulse current.

• Periodical: Advanced Materials Research (Volume 509)
• Pages: 56-63
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.509.56
• Online since: April 2012
• Authors: Yang Liu, Lei Wang, Fei Feng, Xu Dong Lu, Bei Jiang Zhang
• Keywords: Deformation Resistance, Dynamic Recrystallization (DRX), Electroplastic, IN718 Alloy, Pulse Current

References

[1] R. Sharqhi Moshtaqhin, S. Asqari, The influence of thermal exposure on the γ'-precipitates characteristics and tensile behavior of superalloy IN-738LC, J. Mater. Process. Technol. 147 (2004) 343-350.

DOI: 10.1016/j.jmatprotec.2004.01.006

[2] H. Monajati, M. Jahazi, R. Bahrami, S. Yue, The influence of heat treatment conditions on g¢ characteristics in Udimet 720, Mater. Sci. Eng. A373 (2004) 286-293.

DOI: 10.1016/j.msea.2004.01.027

[3] Y. Liu, L. Wang, S. Wang, T. Cui, Effects of temperature on tensile properties and deformation behavior of GH4586A superalloy, J. Mater. Metal. 5 (2006) 288-291.

[4] H. Conrad, Influence of an electric or magnetic field on the liquid-solid transformation in materials and on the microstructure of the solid, Mater. Sci. Eng. A287 (2000) 205-212.

[5] Z.H. Xu, G.Y. Tang, S.Q. Tian, F. Ding, H.Y. Tian, Research of electroplastic rolling of AZ31 Mg alloy strip, J. Mater. Process. Technol. 182 (2007) 128-133.

DOI: 10.1016/j.jmatprotec.2006.07.019

[6] H. Conrad, N. Karam, S. Mannan, A.F. Sprecher, Effect of electric current pulses on the recrystallization kinetics of copper, Scr. Metall. 22 (1988) 235-238.

DOI: 10.1016/s0036-9748(88)80340-5

[7] G.Y. Tang, J. Zhang, M.X. Zheng, J. Zhang, W. Fang, Q. Li, Experimental study of electroplastic effect on stainless steel wire 304L, Mater. Sci. Eng. A281 (2000) 263-267.

DOI: 10.1016/s0921-5093(99)00708-x

[8] H. Conrad, Electroplasticity in Metals and Ceramics, Mater. Sci. Eng. A287 (2000) 276-287.

[9] O.A. Troitskii, Pressure shaping by the application of a high energy, Mater. Sci. Eng. A75 (1985) 37-50.