Determination of Residual Stresses After Laser Remelting of Flame Sprayed Fe-Ni-Co-Mo Coating

Zoran Bergant; Janez Grum

doi:10.4028/www.scientific.net/MSF.681.468

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HomeMaterials Science ForumMaterials Science Forum Vol. 681Determination of Residual Stresses After Laser...

Determination of Residual Stresses After Laser Remelting of Flame Sprayed Fe-Ni-Co-Mo Coating

Abstract:

In this paper, the residual stresses on flat specimens, made from 12-nickel precipitation hardening maraging hot-working tool steel coated with Fe-Ni-Co-Mo and subsuquent laser remelted using Nd:YAG laser, were determined using the hole drilling method. In this newly proposed multi-step process for hot working tool steel reparation, the residual stresses are generated during each step by different physical mechanisms. The flame spraying is a highly productive technique to replace worn out material but with limited bonding to the substrate material. Subsequent laser remelting improves coating's bonding with substrate, coating's density and deoxidation to improve wear resistance, erosion and corrosion resistance of the flame sprayed coatings. After laser remelting, the tensile stresses in coatings slightly reduces or shifts into compressive which in turns improves the crack initiation resistance of the repaired surface of the thermomechanicaly loaded die casting tool.

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Periodical:

Materials Science Forum (Volume 681)

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468-473

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.681.468

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Online since:

March 2011

Authors:

Zoran Bergant, Janez Grum

Keywords:

Flame Spraying, Hole-Drilling Method, Laser Remelting

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