Diffusion Coefficient and Spectroscopy Analysis during Plasma Electrolytic Carburizing on T8 Carbon Steel

doi:10.11901/1005.3093.2015.349

Chinese Journal of Materials Research

2016, Vol. 30

Issue (9): 655-661 DOI: 10.11901/1005.3093.2015.349

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Diffusion Coefficient and Spectroscopy Analysis during Plasma Electrolytic Carburizing on T8 Carbon Steel

Jie WU^1,²,Yifan ZHANG^1,²,Xiaoyue JIN^1,²,Xuan YANG^1,²,Lin CHEN^1,²,Wenbin XUE^1,^2,^*

1. Key Laboratory for Beam Technology and Materials Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
2. Beijing Radiation Center, Beijing 100875, China

Cite this article:

Jie WU,Yifan ZHANG,Xiaoyue JIN,Xuan YANG,Lin CHEN,Wenbin XUE. Diffusion Coefficient and Spectroscopy Analysis during Plasma Electrolytic Carburizing on T8 Carbon Steel. Chinese Journal of Materials Research, 2016, 30(9): 655-661.

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Abstract

Fast carburization of T8 carbon steel was carried out by plasma electrolytic carburizing (PEC) method in glycerol aqueous solution. The dependence of temperature on the applied voltage for the steel sample was measured with a thermocouple, and the influence of the applied voltage on the diffusion process of carbon and the optical emission spectral features of the plasma discharge was investigated. It was found that a hardening layer of 20-30 μm thick formed after 1min discharge in glycerol aqueous solution; by applied voltage 360 V, the surface temperature of the steel was about 650℃and the diffusion coefficient of carbon was about 6.7×10^-8 cm²s^-1; while by applied voltage 380 V, the surface temperature of the steel and the diffusion coefficient of carbon were about 800℃ and1.5×10^-7 cm²s^-1, respectively. In addition, the discharge plasma within the gaseous envelope by the above two voltages was in local thermal equilibrium (LTE) state with temperatures in the range of 5000-12000 K. The transient high temperature promotes the decomposition of electrolyte and the diffusion of carbon. In comparison with the conventionbal pack cementation process at the same temperature, the diffusion coefficient of carbon was enhanced by an order of magnitude with an obviously reduced activation energy for the PEC process.

Key words: plasma electrolytic carburizing diffusion coefficient optical emission spectroscopy electron temperature

Received: 20 November 2015

Fund: *Supported by National Natural Science Foundation of China Nos 51071031 & 51671032, Specialized Research Fund for the Doctoral Program of Higher Education No.20120003110010

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	Jie WU
	Yifan ZHANG
	Xiaoyue JIN
	Xuan YANG
	Lin CHEN
	Wenbin XUE

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.349 OR https://www.cjmr.org/EN/Y2016/V30/I9/655

Fig.1 Schematic diagram of the apparatus used for PEC process on T8 steel

Fig.2 Dependence of sample temperature on applied voltage at 0.5 mm from top surface

Fig.3 SEM images of the T8 steel after 1 min PEC treatment at 360 V (a) top surface, (b) cross-section

Fig.4 SEM images of the T8 steel after 1 min PEC treatment at 380 V (a) top surface, (b) cross-section

Fig.5 Carbon concentration profiles along the cross-sectional steel after PEC treatment (a) 360 V, (b) 380 V

Fig.6 Comparison of analytical solution curves and measured carbon concentration profiles (a) 360 V, (b) 380 V

Fig.7 Temperature distribution in T8 steel sample during PEC treatment at 360 V (a) and 380 V (b)

Table 1 Fe II lines with the wavelength, transition, statistical weights of upper level, excitation energy and transition probabilities

Fig.8 Typical emission spectrum of PEC treatment on T8 steel at360 V (a) and 380 V (b)

Fig.9 Electron concentration variation with discharge time at 360 V (a) and 380 V (b)

Fig.10 Dependence of electron temperature on discharge time at 360 V (a) and 380 V (b)

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