Prediction of solidification cracking by an empirical-statistical analysis for laser cladding of Inconel 718 powder on a non-weldable substrate

M. Alizadeh-Sh, S. P. H. Marashi, E. Ranjbarnodeh, R. Shoja-Razavi, João Pedro Oliveira

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

This paper presents an empirical-statistical approach to predict solidification cracking during laser cladding of Inconel 718 powder on A-286 Fe-based superalloy. This approach is based on a linear regression analysis and empirical-statistical correlations between the key processing parameters (laser power, P; powder feed rate, F; and scanning speed, V) and the geometrical attributes of single laser cladding tracks. These correlations were used for the development of a processing map which assesses the effects of the geometrical characteristics on the solidification cracking and the required conditions to obtain crack-free clads. Scanning electron microscopy was used for microstructural characterization. Thermodynamic calculations using the non-equilibrium Scheil solidification model were also employed. The empirical-statistical analysis showed that the processing parameters directly associated with the height and angle of single laser cladding tracks are P2[Formula presented]2 and P0.5[Formula presented]1, respectively. The processing map revealed that the dilution ratio is the governing macrostructural attribute required to avoid solidification cracking. Indeed, a substrate dilution ratio lower than 25% shifts the cladding composition to an alloy regime, which has lower susceptibility to solidification cracking. The role of this macrostructural feature in reducing the susceptibility of the fusion zone to solidification cracking is thoroughly discussed.

Original languageEnglish
Article number106244
JournalOptics And Laser Technology
Volume128
DOIs
Publication statusPublished - 1 Aug 2020

Keywords

  • Dilution ratio
  • Inconel 718
  • Laser cladding
  • Processing map
  • Solidification cracking
  • Thermodynamic simulation

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