Construction and numerical simulation of BH compound carburizing control system

doi:10.13251/j.issn.0254-6051.2021.07.041

Abstract

Abstract: Through the reformation of the controllable atmosphere multi-purpose furnace by changing the unused ammonia gas pipeline to the BH carburizing pipeline and designing the control system of catalyst carburizing, the automatic control of the BH carburizing was realized. Then the 20Cr2Ni4A steel was subjected to super carburizing and BH carburizing at 930 ℃, and the carburizing kinetics of this two processes were studied and the distribution curves of carburized layer depth and carbon concentration were simulated. The results show that the carbon diffusion coefficient of BH carburizing is greater than that of super carburizing, and the diffusion coefficient of BH carburizing and super carburizing are 2.084×10^-9 mm²·s^-1 and 1.667×10^-9 mm²·s^-1, respectively. The simulation of carbon concentration distribution and the carburized layer depth of the 20Cr2Ni4A steel during BH carburizing and super carburizing at 930 ℃ are fitted with the actual experimental values. When actual carburizing to achieve the same thickness of carburizing layer, the time required for super carburizing time is higher than that of BH carburizing, and the carburizing rate of BH carburizing is increased by 22.6%.

Key words: 20Cr2Ni4A steel, BH carburizing, numerical simulation

CLC Number:

156.8⁺1

Yi Huaqing, Liu Ke, Su Zhen, Yang Bing, Shu Bing, Luo Zixiang. Construction and numerical simulation of BH compound carburizing control system[J]. Heat Treatment of Metals, 2021, 46(7): 212-217.

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