Effect of extended solid solution of Hf on the microstructure of the laser clad Ni-Fe-Cr-Al-Hf alloys

Journal Article · Sat Aug 01 00:00:00 EDT 1987 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(87)90028-9· OSTI ID:5525097

Singh, J; Mazumder, 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 Hf will provide many beneficial effects for such alloys. The laser cladding technique was used to produce Ni-Fe-Cr-Al-Hf alloys with extended solid solution of Hf. A 10 kW CO/sub 2/ laser with mixed powder feed was used. Optical, scanning electron (SEM) and scanning transmission electron (STEM) microscopy were employed for microstructural studies. Electron probe microanalysis and auger electron spectroscopy were also used for micro-chemical 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.

• Research Organization: Laser Aided Materials Processing Lab., Dept. of Mechanical Engineering, 1206 West Green Street, Univ. of Illinois, Urbana, IL 61801
• OSTI ID: 5525097
• Journal Information: Acta Metall.; (United States), Vol. 35:8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHEMICAL PREPARATION
THERMODYNAMIC PROPERTIES
CHROMIUM ALLOYS
IRON ALLOYS
NICKEL ALLOYS
AUGER ELECTRON SPECTROSCOPY
CARBON DIOXIDE LASERS
COATINGS
GRAIN REFINEMENT
HAFNIUM
HAFNIUM ALLOYS
MICROSTRUCTURE
OPTICAL MICROSCOPY
SCANNING ELECTRON MICROSCOPY
SOLID SOLUTIONS
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE EFFECTS
TRANSMISSION ELECTRON MICROSCOPY
ALLOYS
CRYSTAL STRUCTURE
DISPERSIONS
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELEMENTS
GAS LASERS
LASERS
METALS
MICROSCOPY
MIXTURES
PHYSICAL PROPERTIES
SOLUTIONS
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENTS
360101* - Metals & Alloys- Preparation & Fabrication
360104 - Metals & Alloys- Physical Properties
360102 - Metals & Alloys- Structure & Phase Studies