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首页> 外文期刊>Harterei-Technische Mitteilungen: Zeitschrift fur Werkstoffe Warmebehandlung Fertigung >Effect of surface roughness on the kinetics of mass transfer during gas carburizing
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Effect of surface roughness on the kinetics of mass transfer during gas carburizing

机译：表面粗糙度对气体渗碳过程中传质动力学的影响

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摘要

Despite its worldwide application, gas carburizing faces certain challenges in control and variability. No current carburization model accounts for the effect of surface roughness and is able to predict observed case depth variations. An investigation of the effect of surface roughness on gas carburizing performance, with the aim of developing a functional relationship between surface roughness and the mass transfer coefficient, is reported. A further objective was to model surface roughness effects on the carbon concentration profile and corresponding case depth variations. A scanning laser microscope was used to measure 3D roughness parameters and surface area of AISI 8620 steel samples subject to various surface preparation operations. Carburizing response was analyzed in terms of weight gain, micro-hardness and carbon concentration profiles. The weight gain and surface carbon concentration were used to calculate the mass transfer coefficient. The carburizing kinetics was found to be directly proportional to the surface roughness and was a function of surface area available for carbon transfer. The calculated mass transfer coefficients and mass transfer coefficients from the literature were used as input to the carburization model. Experimentally determined concentration profiles validated the model prediction. It is included that the model can be used to estimate initial surface conditions to improve carburizing performance and for effective process control.
机译：尽管其在世界范围内得到应用，但气体渗碳在控制和可变性方面仍面临某些挑战。当前的渗碳模型没有考虑表面粗糙度的影响，并且无法预测观察到的表面深度变化。为了发展表面粗糙度和传质系数之间的函数关系，研究了表面粗糙度对气体渗碳性能的影响。另一个目标是模拟表面粗糙度对碳浓度曲线和相应的表壳深度变化的影响。使用扫描激光显微镜测量经受各种表面准备操作的AISI 8620钢样品的3D粗糙度参数和表面积。根据增重，显微硬度和碳浓度曲线分析了渗碳响应。重量增加和表面碳浓度用于计算传质系数。发现渗碳动力学与表面粗糙度成正比，并且是可用于碳转移的表面积的函数。从文献计算出的传质系数和传质系数用作渗碳模型的输入。实验确定的浓度曲线验证了模型预测。其中包括该模型可用于估计初始表面条件，以改善渗碳性能和有效的过程控制。

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