Huebner Jan, Rutkowski Paweł, Dębowska Aleksandra, Kata Dariusz
Faculty of Materials Science and Ceramics, Department of Ceramics and Refractories, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland.
Faculty of Metals Engineering and Industrial Computer Science, Department of Surface Engineering and Materials Characterisation, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland.
Materials (Basel). 2020 Jun 30;13(13):2932. doi: 10.3390/ma13132932.
In this study, an Inconel 625-tungsten carbide (WC) composite system was investigated by means of microstructure changes affected by both heating rate and WC content. In order to investigate how the system behaves while exposed to fast thermal processing, controlled melting using a differential thermal analysis (DTA) apparatus was performed on the powders. Two WC powders with different average grain size were used to obtain six compositions of Inconel 625-WC powder mixtures (10, 20, and 30 wt.% WC). They were analyzed under 10 and 30 °C/min heating rate in order to obtain composite samples. Results from DTA together with SEM/energy-dispersive X-ray spectroscopy (EDS) microstructural observations allowed observing material changes during solidification. Because of the extensive microsegregation of alloying elements to liquid and their reactions with C, which derived from dissolved WC, the formation of secondary phases with improved microhardness was possible. The collected results provide a better understanding of material behavior during intensive thermal processing which can be useful when designing materials for the laser additive manufacturing technique.
在本研究中，通过加热速率和碳化钨（WC）含量对微观结构变化的影响，对因科镍合金625 - 碳化钨复合体系进行了研究。为了研究该体系在快速热处理过程中的行为，使用差示热分析（DTA）仪器对粉末进行了受控熔化。使用两种平均粒径不同的WC粉末，获得了六种因科镍合金625 - WC粉末混合物组成（10%、20%和30%重量的WC）。为了获得复合样品，在10和30℃/分钟的加热速率下对它们进行了分析。DTA结果与扫描电子显微镜/能量色散X射线光谱（EDS）微观结构观察结果相结合，使得观察凝固过程中的材料变化成为可能。由于合金元素大量偏析到液相中，并与溶解的WC衍生出的C发生反应，形成具有更高显微硬度的第二相成为可能。所收集的结果有助于更好地理解强化热处理过程中的材料行为，这在为激光增材制造技术设计材料时可能会有所帮助。
