Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (9): 1251-1256.DOI: 10.12068/j.issn.1005-3026.2020.09.006

• Materials & Metallurgy • Previous Articles     Next Articles

High Temperature Vacuum Low-Pressure Pulse Carburizing Process of 12Cr2Ni4A Steel

TIAN Yong, AN Xiao-xue, WANG Zhao-dong, WANG Guo-dong   

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2020-02-20 Revised:2020-02-20 Online:2020-09-15 Published:2020-09-15
  • Contact: AN Xiao-xue
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Abstract: Compared with traditional atmosphere carburizing, the high temperature vacuum carburizing has great advantages in improving carburizing efficiency, product quality and saving energy. The critical parameters of austenite grain growth behavior, diffusion coefficient, and saturation carbon concentration of austenite in 12Cr2Ni4A steel were investigated in this work. Combined with the principle of vacuum low-pressure pulse carburization, the high temperature vacuum low-pressure pulse carburizing process was verified experimentally and the parameters of carburized layer depth and surface carbon concentration were further specified. The results show that under carburizing temperatures of 930, 950 and 980℃, the measured values from the hardness gradient curve and carbon concentration gradient curve of the carburized layer are in good agreement with the expected ones. In additional, the carbon diffusion coefficient and austenite saturation carbon concentration increases with the carburizing temperature, and the carburizing efficiency is increased by 14%~17% when the temperature is increased by every 10℃.

Key words: 12Cr2Ni4A steel, vacuum low-pressure pulse carburizing, high-temperature carburizing, carburized layer depth, carbon concentration

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