Title: Influence of laser deposition technique on surface integrity of 12 Ni maraging tool steel

Authors: Zoran Bergant; Janez Grum

Addresses: Faculty of Mechanical Engineering, Laboratory for Materials Testing and Heat Treatment, Ašker?eva 6, SI-1000 Ljubljana, Slovenia ' Faculty of Mechanical Engineering, Laboratory for Materials Testing and Heat Treatment, Ašker?eva 6, SI-1000 Ljubljana, Slovenia

Abstract: The aim of this investigation is to study the material properties of two coating deposition techniques on 12 Ni maraging tool steel specimens. The first technique is the Nd:YAG laser cladding with coaxial powder injection and the second is the hybrid process of flame spraying with subsequent Nd:YAG laser remelting of sprayed coating. The subsequent precipitation annealing is necessary to obtain the material with similar properties as base material. The surface integrity was studied based on macro- and microstructural examination, chemical analysis and the microhardness and the residual stress distribution. All specimens were precipitation-hardened on required hardness. The through-depth residual stresses were measured and compared. The research shows that the material quality of laser-cladded layers is better than that of layers that were sprayed and laser remelted.

Keywords: laser cladding; maraging steel; surface integrity; laser remelting; residual stresses; flame spraying; coating deposition; microhardness; microstructure; precipitation annealing; laser deposition; nickel; tool steel.

DOI: 10.1504/IJMMP.2013.052643

International Journal of Microstructure and Materials Properties, 2013 Vol.8 No.1/2, pp.17 - 26

Published online: 30 Apr 2013 *

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