Ni-Co Alloys for Steam Turbine Blade Restoration by Welding Application

Research Area: Volume 4,Issue 5, Sept. 2015 Year: 2015
Type of Publication: Article Keywords: Gas Turbine Blade, Welding, Mechanical Testing, Restoration
Authors:
  • I. Rosales
  • M. A. Quintana
  • J. A. Rodriguez
  • R. Guardian
  • L. Falcon-Franco
Journal: IJEIR Volume: 4
Number: 5 Pages: 757-761
Month: September
Abstract:
Ni-Co alloys boron doped were fabricated by induction melting technique. The deposition of the alloys with and without boron was applied by using the TIG welding method (tungsten inert gas). Microstructure analyses of the deposited alloys in the cross-section were performed under SEM techniques. Interface displayed directionally solidified fine equiaxed grains, while columnar grains where observed in the filler with some diffusion degree inner the metal base superior zone. Tension tests have shown that welded samples Ni-Co boron doped present improved resistance, moreover, the samples present good cohesion at the interphase since the fracture occurs in filler material. Numerical analyses were performed and zones of maximum stresses and strains can be detected. These modeling results support with high approximation degree the experimental analyses.

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