Enhanced Carburization of Iron by CH4-containing Gas at 1 573 K

被引：0
|
作者：
Park, Woo-Il [1 ]
Jeong, In-Hyun [1 ]
Jung, Sung-Mo [1 ]
机构：
[1] POSTECH, GIFT, Pohang 790784, South Korea
来源：
ISIJ INTERNATIONAL | 2014年 / 54卷 / 07期
关键词：
carburization; methane; rate controlling step; liquid/solid interface; diffusion; liquid Fe-C; DIFFUSION; REDUCTION; CARBON; CO;
D O I：
10.2355/isijinternational.54.1552
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The carburization rate of iron by N-2-11 vol% CH4 gas was investigated at 1 573 K employing an induction furnace in order to minimize the pre-decomposition of methane. Unlike the carburization of iron by CO or CO+H-2 gases, the carburization rate of iron by CH4-containing gas was controlled not by chemical reaction at the surface, but by diffusion of carbon in the liquid phase of Fe-C. The carburization rate by CH4 was about 30 times faster than that by 50 vol% CO. The effects of H-2 addition and change in CH4 concentration supported that the chemical reaction do not control the total carburization rate. The formation of graphite rods confirmed that the surface had a very high carbon concentration and the chemical reaction rate is sufficiently fast. Numerical simulation of the carbon diffusion in the spherical iron estimated the diffusivity of carbon (D-C(L)) in liquid iron at 1 573 K to be 3 x 10(-9) m(2)/s. In addition, the moving mechanism of liquid/solid interface was schematically proposed.
引用
收藏
页码：1552 / 1559
页数：8
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