International Journal of Metalcasting ( IF 2.6 ) Pub Date : 2021-08-17 , DOI: 10.1007/s40962-021-00660-1 T. Vossel 1 , S. Gor 1 , B. Pustal 1 , A. Bührig-Polaczek 1
With casting being a complex process which involves several physical effects and interactions, a wide array of means for influencing such processes exist. Here, the liquid–solid phase change is of utmost importance, as it is a deciding factor for a part’s final properties. Especially with today’s high critical material property requirements, control of the solidification process is indispensable. For the most part, the cooling of a casting defines its solidification. What determines the cooling process is the heat balance of the system. The foundry industry has been using different approaches for influencing the heat balance for a long time. The application of different kinds of coatings with either insulating or heat transfer promoting properties as well as temperature control via cooling channels inside the mold is widely used. Progress in the field of plasma spraying of coatings and the application of heating conductor surfaces have rendered a new concept possible: The integration of heating conductors inside a coating allows for the release of heat in closest vicinity of the melt–mold interface. This paper depicts the use of numerical simulations to investigate the local application of heating conductor layers inside the mold surface coating for a permanent mold casting process and discusses concepts for influencing the heat balance that would not be possible with state-of-the-art cooling channel approaches.
中文翻译:
评估热导体表面在等离子喷涂涂层内的应用,用于局部、近表面热释放的永久模具金属铸造工艺
由于铸造是一个涉及多种物理效应和相互作用的复杂过程,因此存在多种影响此类过程的方法。在这里,液固相变至关重要,因为它是零件最终性能的决定性因素。尤其是在当今对临界材料性能要求很高的情况下,凝固过程的控制必不可少。在大多数情况下,铸件的冷却决定了它的凝固。决定冷却过程的是系统的热平衡。长期以来,铸造行业一直在使用不同的方法来影响热平衡。具有绝缘或传热促进特性以及通过模具内的冷却通道进行温度控制的不同种类涂层的应用被广泛使用。涂层等离子喷涂领域的进步和加热导体表面的应用使一个新概念成为可能:将加热导体集成在涂层内允许在最靠近熔体-模具界面的地方释放热量。本文描述了使用数值模拟来研究在永久模具铸造过程中模具表面涂层内部加热导体层的局部应用,并讨论了影响热平衡的概念,这是最先进的冷却无法实现的渠道接近。