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Residual stresses in laser cladded and remelted surfaces of 12-Ni maraging steel [Elektronski vir]
Bergant, Zoran ; Grum, Janez, 1946-
In this paper, the residual macrostresses through the surfaced layers, made by two different reparation techniques are determined and compared. The first reparation technique is the Nd:YAG laser ...cladding with coaxial powder injection and the second, the hybrid process of flame spraying with subsequent Nd:YAG laser remelting of sprayed coating. The base material for surface reparation is 12-nickel maraging tool steel. The aim of the repair experiment is to achieve the similar mechanical properties in the fusion zone and in the base material. The residual stresses in laser cladded layers are increasing with depth and are compressive. The major contribution of high compressive stresses is the phase transformation from austenite to martensite while the minor is the material shrinkage which generally leads to tensile stress in the clad layer. The residual stresses generated during flame spraying are tensile and are increasing with the coating thickness. After subsequent laser remelting the values of residual stresses decrease due to microstructure changes during the remelting process.
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