Neutron Diffraction Research of Residual Stress in Metal Plates Deposited on Rigid Substrate by DLMD Method
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eutron Diffraction Research of Residual Stress in Metal Plates Deposited on Rigid Substrate by DLMD Method I. D. Karpova, *, S. A. Rylova, V. T. Ema, A. E. Blagova, S. Y. Ivanovb, c, E. V. Zemlyakovb, c, and K. D. Babkinb, c aNational
Research Center “Kurchatov Institute,” Moscow, 123182 Russia St. Petersburg State Marine Technical University, St. Petersburg, 190121 Russia c Institute of Laser and Welding Technologies, Peter the Great St. Petersburg Polytechnic University, St. Petersburg, 195251 Russia *e-mail: [email protected] b
Received July 7, 2019; revised July 27, 2019; accepted August 6, 2019
Abstract—One of the features of direct laser metal deposition (DLMD) method is presence of high residual stress in produced parts. The information about residual stress distribution is critically important for the competent organization of production processes in additive manufacturing. To study residual stress distribution in large thin-walled parts produced by DLMD, two model samples were manufactured. Small thickness of the samples allowed using the calculation technique that does not require measurement of the lattice parameter of stress-free sample. It is shown that stress distribution in thin-walled plate built on a rigid substrate considerably differs from distribution in plate built on a flexible substrate. Keywords: neutron diffraction, residual stress, direct laser metal deposition, steel, AISI 410, nickel-chromium alloy, Inconel 625 DOI: 10.1134/S1027451020070198
INTRODUCTION Direct laser metal deposition (DLMD) is an additive manufacturing technique, which is increasingly used for an efficient production of large thin-walled parts of complex shape. The component is formed from a metal powder, which is delivered by compressed gas-powder jet to the laser heated zone [1, 2]. Due to high heating rates and high temperature gradients during the deposition, high residual stress arises in such components. High residual stress can reduce the lifetime of the part and can cause its premature failure [3–5]. Thus, the information about stress distribution in deposited parts is extremely necessary for the proper organization of production processes and post-production heat treatment. Neutron diffraction is the only nondestructive method that allows direct strain measurements in the depth of bulk polycrystalline samples and correct residual stress calculation. For this reason, the neutron method is actively used for the stress studies in additive manufactured samples. The subjects of previous neutron studies [6–8] were thin-walled specimens from AISI 316 stainless steel [6], AISI 410 stainless steel [7] and Inconel 625 nickel-chromium alloy [8] deposited on flexible substrates. Such substrates are not used in industry due to their deformation during the deposition process. This study was aimed to the research of residual stress dis-
tribution in metal plates manufactured by DLMD method on rigid substrate. SAMPLES MANUFACTURE The model samples were manufactured at the Institute of Laser and Welding Technologies, St. Pet
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