Effects of Material Properties for Non-Equilibrium Conditions in Induction Heating Process

Abstract

As the induction heating is very fast, it is reasonable to assume that the material properties are different from those measured under thermodynamic equilibrium conditions. For this reason, this study attempts to measure the effect of material properties variations on the surface temperature using the 2D axisymmetric model. The results show that the relative magnetic permeability is the property that most significantly influences surface temperatures and the hardness profile. The effects of specific heat and electrical conductivity are rather low, while the thermal conductivity has a negligible effect on the model developed. Moreover, the variation ofaustenitizingtemperature of margins has limited effects on the developed model. Therefore, the use of material properties at thermodynamic equilibrium was sufficient to establish models able to predict trends.

Improvement of catheter tip morphology by mold material used for tip‐forming process

“…In general, STS 420 is used for the catheter tip to form a mold. This is because the material has excellent thermal characteristics and is used owing to its excellent heating efficiency in induction heating 18–22 . However, as a side effect of the excellent heating efficiency, the temperature change range for the process conditions was large, which created an environment in which flash was likely to occur during catheter tip forming.…”

“…This is because the material has excellent thermal characteristics and is used owing to its excellent heating efficiency in induction heating. [18][19][20][21][22] However, as a side effect of the excellent heating efficiency, the temperature change range for the process conditions was large, which created an environment in which flash was likely to occur during catheter tip forming. Polymers applied to catheters are characterized by a decrease in viscosity as they exhibit shear-thinning behavior with increasing temperature.…”