Kotarska Aleksandra, Poloczek Tomasz, Janicki Damian
Welding Department, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego Street 18A, 44-100 Gliwice, Poland.
Materials (Basel). 2021 Apr 26;14(9):2225. doi: 10.3390/ma14092225.
The article presents research in the field of laser cladding of metal-matrix composite (MMC) coatings. Nickel-based superalloys show attractive properties including high tensile strength, fatigue resistance, high-temperature corrosion resistance and toughness, which makes them widely used in the industry. Due to the insufficient wear resistance of nickel-based superalloys, many scientists are investigating the possibility of producing nickel-based superalloys matrix composites. For this study, the powder mixtures of Inconel 625 superalloy with 10, 20 and 40 vol.% of TiC particles were used to produce MMC coatings by laser cladding. The titanium carbides were chosen as reinforcing material due to high thermal stability and hardness. The multi-run coatings were tested using penetrant testing, macroscopic and microscopic observations, microhardness measurements and solid particle erosive test according to ASTM G76-04 standard. The TiC particles partially dissolved in the structure during the laser cladding process, which resulted in titanium and carbon enrichment of the matrix and the occurrence of precipitates formation in the structure. The process parameters and coatings chemical composition variation had an influence on coatings average hardness and erosion rates.
本文介绍了金属基复合材料（MMC）涂层激光熔覆领域的研究。镍基高温合金具有诸多吸引人的性能，包括高抗拉强度、抗疲劳性、耐高温腐蚀性和韧性，这使得它们在工业中得到广泛应用。由于镍基高温合金的耐磨性不足，许多科学家正在研究生产镍基高温合金基复合材料的可能性。在本研究中，使用了含有10%、20%和40%（体积分数）TiC颗粒的Inconel 625高温合金粉末混合物，通过激光熔覆制备MMC涂层。选择碳化钛作为增强材料是因为其具有高热稳定性和硬度。根据ASTM G76 - 04标准，采用渗透检测、宏观和微观观察、显微硬度测量以及固体颗粒冲蚀试验对多层涂层进行了测试。在激光熔覆过程中，TiC颗粒部分溶解于组织中，导致基体中钛和碳的富集以及组织中析出相的形成。工艺参数和涂层化学成分的变化对涂层的平均硬度和冲蚀速率有影响。
