Morphology of weld heat-affected zone liquation cracking in Ta-modified cast alloy 718

Journal Article · Wed Nov 01 00:00:00 EST 1989 · Metallography (An International Journal); (USA)

DOI:https://doi.org/10.1016/0026-0800(89)90033-5· OSTI ID:7171860

West, S L; Baeslack, W A ^[1]; Kelly, T J ^[2]

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1. Ohio State Univ., Columbus, OH (USA). Dept. of Welding Engineering
2. General Electric Co., Cincinnati, OH (USA). Aircraft Engine Business Group

The authors' discuss some problems involved in the use of alloy 718 which is a precipitation-hardenable, nickel-base superalloy developed in the early 1960s for medium temperature (540-705{sup 0}C) aerospace applications. The use of Nb as a substitute for Al and Ti leads to a susceptibility to liquation cracking in the weld heat-affected zone (HAZ). This problem is discussed in detail in the article.

• OSTI ID: 7171860
• Journal Information: Metallography (An International Journal); (USA), Vol. 23:3; ISSN 0026-0800
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
MATERIALS TESTING
NICKEL BASE ALLOYS
MORPHOLOGY
ALUMINIUM
CHEMICAL COMPOSITION
CORROSION RESISTANCE
CRACKING
GRAIN BOUNDARIES
NIOBIUM
PRECIPITATION HARDENING
TANTALUM ADDITIONS
TEMPERATURE EFFECTS
TITANIUM
ALLOYS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DECOMPOSITION
ELEMENTS
HARDENING
INDUSTRY
METALS
MICROSTRUCTURE
NICKEL ALLOYS
PYROLYSIS
TANTALUM ALLOYS
TESTING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties
360105 - Metals & Alloys- Corrosion & Erosion
360104 - Metals & Alloys- Physical Properties