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Title: Laves phase in alloy 718 fusion zone — microscopic and calorimetric studies

Microstructural characterization of alloy 718 fusion zone welded with both solid solution and age hardenable filler metal has been done. The microsegregation and the aging response were studied by employing three levels of weld cooling rate. Gas Tungsten Arc welding process was used. The fusion zone of solid solution filler metal has been responding to the aging treatment due to the weld process conditions and weld metal chemistry. However the weld metal composition was modified due to the higher molybdenum (Mo) content in solid solution filler metal. The effect of this modification on the phase reaction temperatures was studied and the same was compared with the conventional filler metal. - Graphical abstract: Display Omitted - Highlights: • Interdendritic segregation has been controlled by weld cooling rate. • Laves phase formation has been studied with cooling rate and weld metal chemistry. • Aging response with solid solution filler metal has been demonstrated. • Reduction in Laves phase and alloying element segregation has been confirmed. • Reaction temperatures were found modified because of Mo addition.
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Indian Space Research Organization, India, (India)
  2. University of Utah, Salt Lake City, UT (United States)
  3. Indian Institute of Technology Madras (India)
Publication Date:
OSTI Identifier:
22476044
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 100; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; CALORIMETRY; FILLER METALS; GAS TUNGSTEN-ARC WELDING; LAVES PHASES; MICROSTRUCTURE; MODIFICATIONS; MOLYBDENUM; SEGREGATION; SOLID SOLUTIONS; WELDED JOINTS; X-RAY DIFFRACTION