Hydrodynamic instability in high-speed direct laser deposition for additive manufacturing

G.A. Turichin, E.V. Zemlyakov, O.G. Klimova, K.D. Babkin

High speed direct laser deposition, when product forms from metal powder, transfered by gas-powder jet, supplied coaxially or non-coaxially to focused laser beam, in one of most prospective additive technologies for production parts for aircraft engines. The limit of process productivity is connected with development of hydrodynamic instability of the melt pool in conditions of high power laser action and material supply by gas-powder jet. Theoretical analysis and experiments allowed clarifed a physycal nature of instability apperance, determine a stability conditions and invent a methods which allow avoid instability in deposition process. More...

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