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

Journal Article · Sun Feb 15 04:00:00 EST 2015 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2014.11.035· OSTI ID:22476044

Manikandan, S. G.K., ^[1]

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1. Indian Space Research Organization, India, (India)

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.

• OSTI ID: 22476044
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 100; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
CALORIMETRY
FILLER METALS
GAS TUNGSTEN-ARC WELDING
LAVES PHASES
MICROSTRUCTURE
MODIFICATIONS
MOLYBDENUM
SEGREGATION
SOLID SOLUTIONS
WELDED JOINTS
X-RAY DIFFRACTION