A hardness study on laser cladded surfaces for selected bead overlap conditions

Paper #:
  • 2017-01-0285

Published:
  • 2017-03-28
Abstract:
Laser cladding is used to coat a surface of a metal to enhance the metallurgical properties of a substrate such as corrosion and wear resistance. For a surface cladding operations, overlapping bead geometry is required. Single bead analyses do not provide a complete representation of essential properties. The research scope targets the coaxial laser cladding process specifically for P420 stainless steel clad powder using a fiber optic laser with a 4.3 mm spot size on a low/medium carbon structural steel plate (AISI 1018). Many process parameters influence the bead geometrical shape, and the bead characteristics are varying for different overlap bead conditions. The complex temperature distributions in the process could cause subsequent large variations in hardness values. The bead overlap configurations experiments performed with 40%, 50% and 60% bead overlaps for a three pass bead formation. A three dimensional transient fully coupled thermal-metallurgical-mechanical finite element (FE) model was developed to simulate hardness variations in the laser cladded component for cladding of P420 stainless steel clad powder onto a AISI 1018 substrate material. For the simulation, the thermo-physical and thermo-mechanical data of the clad and substrate materials in the range of room temperature to the melting temperature are assigned as an input data for the analysis. The FE model will be used for process planning strategies. The numerical results of the microhardness, melt pool, and heat affected zone (HAZ) will be compared with Vickers microhardness measurements, melt pool and HAZ geometry. The results will provide relevant information for process planning decisions and will provide a baseline for predicting properties of metal additive manufactured components.
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