为控制Ф5.5 mm LX72A盘条的脱碳层深度不超过0.05 mm,对影响脱碳层深度的因素进行研究分析并制定控制措施:加热炉均热段温度由1110~1150℃降低到1070~1110℃,炉内钢坯采用间隔布料的方式以减少加热时间,严格控制炉内空燃比。采取控制...为控制Ф5.5 mm LX72A盘条的脱碳层深度不超过0.05 mm,对影响脱碳层深度的因素进行研究分析并制定控制措施:加热炉均热段温度由1110~1150℃降低到1070~1110℃,炉内钢坯采用间隔布料的方式以减少加热时间,严格控制炉内空燃比。采取控制措施后,Ф5.5 mm LX72A盘条脱碳层深度不大于0.05 mm,满足用户要求。展开更多
To elucidate the diffusion behavior of carbon atoms within the austenite region,the decarbonization of 72LX steel bloom was investigated.Experimental studies were performed to obtain the depth profiles of the decarbur...To elucidate the diffusion behavior of carbon atoms within the austenite region,the decarbonization of 72LX steel bloom was investigated.Experimental studies were performed to obtain the depth profiles of the decarburized layers within the temperature range of 950-1250℃.The findings show that,within a temperature range of 950-1200℃,both the depth of the decarburization layer of the grain interior(h_(in))and the depth of the decarbonization effect zone of the grain boundary(h_(b))increase concurrently with increasing holding temperatures and times and an inflection point is observed at 1200℃.By measuring the change in the sample diameter before and after the experiment,the change in the radius reduction of h_(Fe) causes by oxidation is obtained.Minimal changes are observed in h_(Fe) when the temperature is below 1050℃.As the temperature increases to 1100℃,a sudden change in h_(Fe) is observed,which corresponds to a rapid increase in oxidation.At temperatures above 1100℃,a more gradual change is observed.From the experimental results,a two-dimensional decarburization mathematical model is established and the carbon diffusion coefficients at different temperatures are obtained by simulation and regression fitting.The simulation values obtain from the carbon diffusion model matched well with the experimental values,thereby confirming the accuracy of the simulation process.展开更多
文摘为控制Ф5.5 mm LX72A盘条的脱碳层深度不超过0.05 mm,对影响脱碳层深度的因素进行研究分析并制定控制措施:加热炉均热段温度由1110~1150℃降低到1070~1110℃,炉内钢坯采用间隔布料的方式以减少加热时间,严格控制炉内空燃比。采取控制措施后,Ф5.5 mm LX72A盘条脱碳层深度不大于0.05 mm,满足用户要求。
基金Funded by the National Natural Science Foundation of China(U20A20272)the Special Projects for Military-Civilian Collaborative Innovation in Science and Technology of Hebei Province(202231401010003)the Open Topic of Key Laboratory of Material Forming and Structure Property Control from University of Science and Technology Liaoning(USTLKFSY201708)。
文摘To elucidate the diffusion behavior of carbon atoms within the austenite region,the decarbonization of 72LX steel bloom was investigated.Experimental studies were performed to obtain the depth profiles of the decarburized layers within the temperature range of 950-1250℃.The findings show that,within a temperature range of 950-1200℃,both the depth of the decarburization layer of the grain interior(h_(in))and the depth of the decarbonization effect zone of the grain boundary(h_(b))increase concurrently with increasing holding temperatures and times and an inflection point is observed at 1200℃.By measuring the change in the sample diameter before and after the experiment,the change in the radius reduction of h_(Fe) causes by oxidation is obtained.Minimal changes are observed in h_(Fe) when the temperature is below 1050℃.As the temperature increases to 1100℃,a sudden change in h_(Fe) is observed,which corresponds to a rapid increase in oxidation.At temperatures above 1100℃,a more gradual change is observed.From the experimental results,a two-dimensional decarburization mathematical model is established and the carbon diffusion coefficients at different temperatures are obtained by simulation and regression fitting.The simulation values obtain from the carbon diffusion model matched well with the experimental values,thereby confirming the accuracy of the simulation process.
