弹簧钢等温加热过程脱碳行为的数值模拟  

Numerical simulation of decarburization behavior of spring steel during isothermal heating process

作　　者：袁伟 陈银莉 杨毅 邱雷 李辰宁 YUAN Wei;CHEN Yinli;YANG Yi;QIU Lei;LI Chenning(Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁共性技术协同创新中心,北京100083

出　　处：《轧钢》2024年第3期69-77,共9页Steel Rolling

基　　金：十三五重点研发计划项目(2017YFB0304602)。

摘　　要：弹簧钢表面脱碳是影响其疲劳寿命的主要原因,对此诸多学者提出了各种模型来模拟其脱碳行为。考虑脱碳过程中的氧化行为,提出了一种基于有限容积法的弹簧钢钢坯二维氧化-脱碳综合模型。对空气气氛下的55SiCr弹簧钢进行等温加热实验,在950~1150℃等温30~150 min条件下,氧化层厚度随时间变化规律呈抛物线趋势,根据实验结果建立了55SiCr弹簧钢氧化层厚度计算模型;依据菲克第二定律,建立了55SiCr弹簧钢二维脱碳数学模型,将两个模型相结合,得到其钢坯二维氧化-脱碳综合模型。该模型可以定量描述加热温度和保温时间对弹簧钢表面脱碳的影响,并将脱碳模型的预测结果与实验结果进行对比,验证了该模型的有效性。Surface decarburization of spring steel is the main reason for its fatigue life,for which many scholars have proposed various models to simulate its decarburization behavior.Considering the oxidation behavior in the decarburization process,a two-dimensional oxidation-decarburization synthetic model of spring steel billet based on finite volume method was proposed.Isothermal heating experiments were carried out on 55SiCr spring steel in air atmosphere.Under the conditions of 950-1150℃and 30-150 min isothermal heating,the thickness of the oxide layer changed with time in a parabolic trend.According to the experimental results,the calculation model of the oxide layer thickness of 55SiCr spring steel was established.According to Ficks second law,the two-dimensional decarburization mathematical model of 55SiCr spring steel was established.The two models were combined to obtain the two-dimensional oxidation-decarburization synthetic model of spring steel billet.The model can quantitatively describe the effects of heating temperature and holding time on the surface decarburization of spring steel.The prediction results of the decarburization model were compared with the experimental results,which verified the effectiveness of the model.

关 键 词：脱碳 氧化 数值模拟 弹簧钢 碳扩散 

分 类 号：TG142.1[一般工业技术—材料科学与工程]