Laser cladding of Ni+Cr+Al+rare earth alloys for improved oxidation and hot corrosion. Annual progress report, November 1985-November 1986

Technical Report · Sat Nov 01 04:00:00 EST 1986

OSTI ID:6418563

Mazumder, J; Kar, A; Singh, J

Alloys and coatings for alloys for improved high-temperature service life under aggressive atmosphere are of great contemporary interest. There is a general consensus that addition of reactive elements such as hafnium will provide many beneficial effects for such alloys. The laser-cladding technique was used to produce nickel-iron-chromium-aluminum-hafnium alloys. The laser cladding technique was used to produce Ni-Fe-Cr-Al-Hf alloys with extended solid solution of Hf. A 10-kW carbon dioxide laser with mixed powder feed was used for laser cladding. Optical, scanning electron microscopy (SEM) and scanning transmission electron (STEM) microscopy were employed for microstructural evolution of alloys produced during laser cladding processes. The electron probe microanalysis and the auger electron spectroscopy were also used for microchemical analysis of different phases. Microstructural studies revealed a high degree of grain refinement, considerable increase in solubility of Hf in matrix and Hf-rich precipitates and new metastable phases. The microstructural development in this laser clad Ni-Fe-Cr-Al-Hf alloy is reported.

• Research Organization: Illinois Univ., Urbana (USA). Dept. of Mechanical and Industrial Engineering
• OSTI ID: 6418563
• Report Number(s): AD-A-179794/3/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
AUGER ELECTRON SPECTROSCOPY
CARBON DIOXIDE LASERS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CLADDING
COATINGS
CORROSION
CORROSION PROTECTION
CRYSTAL STRUCTURE
DEPOSITION
DISPERSIONS
ELECTRON SPECTROSCOPY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
GAS LASERS
HAFNIUM ALLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
IRON ALLOYS
LASERS
LEPTONS
MATERIALS
MICROANALYSIS
MICROSCOPY
MICROSTRUCTURE
MIXTURES
NICKEL ALLOYS
OXIDATION
PROCESSING
PROTECTIVE COATINGS
REFINING
SOLID SOLUTIONS
SOLUBILITY
SOLUTIONS
SPECTROSCOPY
SURFACE COATING