2mm铁碳合金薄带固态脱碳试验

Experiment of solid state decarburization process of 2 mm Fe-C alloy sheet

为了探究2 mm厚的铁碳合金薄带固相脱碳规律。试验以Ar-H2-H_2O为脱碳气氛,在可控气氛管式炉内对Fe-C合金薄带进行脱碳。把初始碳质量分数为4.15%和3.20%的2 mm铁碳合金薄带分别放入加热场中,然后控制不同加热温度和脱碳时间进行脱碳研究。结果表明,碳向反应界面的扩散是脱碳反应的限制性环节,脱碳温度的升高和脱碳保温时间的延长均有利于脱碳,初始碳质量分数不同的铁碳合金薄带前期脱碳速率相同。由于薄带较厚,恒温脱碳不能达到脱碳要求,从而提出了分段加热脱碳法,脱碳效果良好,初始碳质量分数为4.15%的铁碳合金薄带70 min可脱到0.28%,初始碳质量分数为3.20%的铁碳合金薄带50 min可脱到0.23%。

In order to study the law of solid phase decarburization reaction of 2 mm Fe-C alloy sheets, the Fe-C alloy sheets were decarburized by introducing oxidizing gas of Ar-H2-H2O into the horizontal furnace for producing low car- bon steel sheets. The Fe-C alloy sheets which initial carbon contents were 4.15% and 3.2%, were placed in heating atmo- sphere. Various heating temperature and decarburization time were investigated. The results showed that the diffusion of carbon to the reaction interface is the rate controlling step of the decarburizing process, and both higher decarburization temperature and longer decarburization time are beneficial to the decarburization process. The Fe-C alloy sheets which have different initial carbon content have the same decarburization rate in the early stage of the reaction. The Fe-C alloy sheet is so thick that the final carbon content can not meet the requirement, thus, a segmented heating decarburization process is proposed to serve this issue. This process has a positive influence on decarburization, and it is found that sheets with 0.28% C （mass percent） can be produced from sheets with initial 4.15% C （mass percent） and with the thick- ness of 2.0 mm through segmented heating decarburization process within 70 min, and sheets with 0.23% C （mass per- cent） can be produced from sheets with initial 4.15% C （mass percent） and with the thickness of 2.0 mm through seg- mented heating decarburization process within 50 min.