Theory and Technology of Direct Laser Deposition

Abstract

Presently the additive technologies in manufacturing are widely developed in all industrialized countries. Replacing the traditional technology of casting and machining with additive technologies, one can significantly reduce material consumption and labor costs. They also allow obtaining products with desired properties. The most promising for manufacturing large-sized products is the additive technology of high-speed direct laser deposition. Using this technology allows to create complex parts and construction to one technological operation without using addition equipment and tools. This technology allows decreasing of consumption of raw materials and decrease amount of waste. Equipment for realization of DLD technology is universal and based on module design principle. DLD is based on layer-by-layer deposition and melting of powder by laser beam from using a sliced 3D computer-aided design (CAD) file. The materials used are powders based on Fe, Ni, and Ti. This chapter presents the results of machine design and research HS DLD technology from various materials.

Effect of Powder Fraction 09CrNi2MoCu on the Structure and Properties of the Obtained Samples Using the Direct Laser Deposition

“…The method of direct laser deposition is that the powder is applied to the surface of the substrate, in the area of the laser beam, using a compressed gas jet. Under the influence of laser radiation, the powder particles melt and fall into the molten pool, after crystallization a weld bed of a certain shape and size forms, thus it is possible to weld the layers on each other infinitely many times, thereby obtaining pre-modeled parts of the desired geometric dimensions [2]. Thus, it becomes possible to relatively fast production of the parts of complex geometric shape that are not inferior to products obtained by traditional methods in quality, physical and mechanical properties [3][4][5][6].…”

Effect of Process Parameters on Microstructure and Mechanical Properties of Direct Laser Deposited Cold-Resistant Steel 09CrNi2MoCu for Arctic Application

“…Steel is widely used in shipbuilding, mechanical engineering, aircraft manufacturing and aerospace industry due to their universal properties. Direct laser deposition (DLD) makes it possible to obtain parts from various alloys with different wall thicknesses, surpassing the physic mechanical properties of parts made by traditional production technologies [1][2][3][4][5][6][7]. The fabrication of parts from cold-resistant steel is one of the newest areas of production of the 21st century, which are widely used in the Arctic and northern regions, strategically important areas of production.…”