Abstract
Abstract Paper presents results of laser additive manufacturing. Deposition of nickel based super alloy Inconel 625 was performed. Laser metal deposition is advanced manufacturing process dedicated for prototyping and low scale series production. Inconel 625 is nickel based super alloy, with high heat resistance properties. Therefore due material properties and chemical composition is characterized as a difficult to machining [1, 2]. Additive manufacturing process using focused photons beam for selective deposition of metallic powder in laser engineered net shaping (LENS) method can be used as alternative technology. High energy density of controllable laser beam combining with coaxial delivery system allow to precise deposited metallic powder. Manufacturing process are based on selective melting of additional material using laser radiation and crystallization process. An additional material in form of filler wire as well as metallic powder can be used. Advantages of using metallic powder are higher level of process control, nevertheless adequate selection of process parameters are required. High energy density of laser beam and rapid crystallization process affect on metallographic structure of deposited material. Thermal energy absorbed in material affect on phase transformation.Molten powder mixing with base material changing metallographic structure. Chemical composition of obtained overlay weld are combination of base and additive material. Therefore to achieve stable crystallization process chemical composition of additive material wassimilar to base material. Additional alloying elements could affect on mechanical properties. Deposition process using TruLaserCell 1005 laser machine was performed. To determine properties of manufactured material metallographic analysis and destructive tests were performed.
Highlights
Inconel is an advanced nickel based alloy with wide application potential, mostly used in welding and coating applications
Additive manufacturing process using focused photons beam for selective deposition of metallic powder in laser engineered net shaping (LENS) method can be used as alternative technology
Initial conditions in prototyping process are differ, laser beam absorption increasing during depositions of subsequent layers, this phenomena are related to volume of heat accumulated in material
Summary
Inconel is an advanced nickel based alloy with wide application potential, mostly used in welding and coating applications. Laser additive deposition is modern technology using for cladding and rapid prototyping of metals. Due to using metallic powders or filler wire as an additional material and laser beam as a heat source precision deposition process can be carried out. Nickel based alloys use for modification and prototyping processes are extensively studied by many researchers. Numerous publication of rapid prototyping, padding welding, cladding are related to modification of surface properties and elements manufacturing using SLM method [3,4,5,6,7]. Prototyping process are based on selective deposition of additional material. Paper present possibility of use Inconel 625 and LENS deposition technology for prototyping of cuboids shape solid specimen and studied properties of deposited material using destructive tests and metallographic analysis
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