Metal additive manufacturing in the commercial aviation industry: A review

The applications of Additive Manufacturing (AM) have been grown up rapidly in various industries in the past few decades. Among them, aerospace has been attracted more attention due to heavy investment of the principal aviation companies for developing the AM industrial applications. However, many studies have been going on to make it more versatile and safer technology and require making development in novel materials, technologies, process design, and cost efficiency. As a matter of fact, AM has a great potential to make a revolution in the global parts manufacturing and distribution while offering less complexity, lower cost, and energy consumption, and very highly customization. The current paper aims to review the last updates on AM technologies, material issues, post-processes, and design aspects, particularly in the aviation industry. Moreover, the AM process is investigated economically including various cost models, spare part digitalization and environmental consequences. This review would be helpfully applied in both academia and industry as well

Review of the Effects of Friction Stir Welding Speed on Stainless Steel Type 304L.

Friction Stir Welding (FSW) is a solid state welding method and is common for aluminum alloys. There have been many studies to apply this process for high melting materials such as steels and titanium. To make it applicable, there are many variables that must be considered, which one of them is FSW speed. Welding on high melting materials such as steels and titanium with traditional methods needs too high energy, many welders, electrodes, and generally is time consuming. By using friction stir welding, cost would be reduced on consumable materials, welders and energy. However, considerations of feasibility and different conditions for optimizing the method are so important. In this review paper, the main discussion was about stainless steel 304L and investigated the effects of friction stir welding speeds. Finally, a brief discussion was presented to summarize the effects of speed on friction stir welding

Additive manufacturing of biopolymers

International audienceThis chapter gives a brief overview of the additive manufacturing of biopolymers. First, it clarifies the meaning of “biopolymers”, then provides a classification of biopolymers based on their source and biodegradability. Also, the applicable techniques for additive manufacturing of biopolymers are described as well as the main challenges of each printing method. In the end, a brief description of each chapter and its mission in the frame of the present book is given

Laser welding of NiTi shape memory alloy: a review

NiTi shape memory alloys (SMA) are broadly employed in multifunctional systems in several industrial domains, like aerospace, automotive, biomedical and power plants. Their functional properties, which include shape memory effect (SME) and superelasticity (SE), offer a particular flexibility to design many smart components. However, scientists and practitioners are still facing some restrictions in machining processes and joining techniques of NiTi SMAs to both similar and dissimilar materials. Compared to other procedures, laser welding is an economical and reliable joining technique for NiTi SMAs. Nevertheless, it is considered a challenging technique, with many obstacles still to overcome to achieve welded joints characterized by the necessary strength and the required functionalities. In this respect, the present work investigates the effects of laser welding process on the functional properties of NiTi and related alloys. Mechanical, microstructural, and metallurgical effects of the process are reported, as well. Lastly, the impact of the post-weld heat treatment (PWHT) is studied as an effective solution to improve the downsides of the laser welding process