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首页> 外文期刊>Journal of Materials Processing Technology >Process parameters and formation mechanism of SiCf/Ti6Al4V composites manufactured by a hybrid additive manufacturing method
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Process parameters and formation mechanism of SiCf/Ti6Al4V composites manufactured by a hybrid additive manufacturing method

机译：用混合添加剂制造方法制造的SICF / TI6AL4V复合材料的工艺参数和形成机理

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摘要

SiCf/Ti6Al4V composites have been widely used in aerospace engineering due to their high specific strength, high specific stiffness, and low density, but traditional preparation methods have high costs and long cycle times. In this paper, SiCf/Ti6Al4V composites were manufactured by a hybrid additive manufacturing method named laser cladding & laminated deposition (LCLD), which combines laser direct energy deposition (DED) and laminated object manufacturing (LOM) techniques. LCLD was performed using an automatic fiber-laying machine. SiC fibers were easily damaged during laser illumination and metal melting. Reducing the heat input decreased fiber damage, but the cladding quality of SiCf/Ti6Al4V deteriorated. The fiber damage under different process parameters was studied. Re-scanning was used to improve the cladding quality of SiCf/Ti6Al4V while preventing damage to the fiber. The results confirm that the hybrid method combining DED and LOM is promising for SiCf/Ti6Al4V composite production. The shielding gas flow rate and defocusing amount did not affect the manufacture of composite materials. Fiber damage was decreased, and unfused defects increased upon increasing the scanning speed and powder feed rate. Upon increasing the laser power, fiber damage was increased, and the number of unfused defects decreased. The optimized parameters were a laser power of 250 W, a scanning speed of 10 mm/s, and a powder feed rate of 2.5 g/min, according to orthogonal experiment results. The cladding quality was significantly improved by the re-scanning process, and intact fibers were obtained. The main components of the interfacial reaction layer were Ti, C, and Si, and the EDS results showed that some C diffused from the fiber to the matrix and interfacial reaction layer.
机译：SiCf/Ti6Al4V复合材料具有比强度高、比刚度高、密度低等优点，在航空航天工程中得到了广泛的应用，但传统的制备方法成本高、周期长。本文采用激光熔覆层压沉积（LCLD）技术，将激光直接能量沉积（DED）技术和层压物体制造（LOM）技术相结合，制备了SiCf/Ti6Al4V复合材料。LCLD使用自动纤维铺设机进行。SiC纤维在激光照射和金属熔化过程中容易受到损伤。降低热输入降低了光纤损伤，但SiCf/Ti6Al4V的包层质量恶化。研究了不同工艺参数对纤维损伤的影响。为了提高SiCf/Ti6Al4V的包层质量，同时防止光纤损坏，采用了再扫描技术。结果表明，将DED和LOM相结合的混合方法有望用于SiCf/Ti6Al4V复合材料的生产。保护气体流量和离焦量对复合材料的制备没有影响。随着扫描速度和送粉速度的增加，纤维损伤减少，未熔缺陷增加。随着激光功率的增加，光纤损伤增加，未熔合缺陷数量减少。根据正交实验结果，优化参数为激光功率250w，扫描速度10mm/s，送粉速度2.5g/min。再扫描工艺显著提高了包层质量，获得了完整的光纤。界面反应层的主要成分为Ti、C和Si，EDS结果表明，部分C从纤维扩散到基体和界面反应层。

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