Weld solidification and HAZ liquation in a metastable-beta titanium alloy—Beta-21S

Beta-21S is a new, metastable-beta titanium alloy (nominal composition, Ti--15Mo--2.7Nb--3Al--0.2Si), which exhibits excellent oxidation resistance and mechanical properties at elevated temperatures. From a weld solidification standpoint, this alloy chemistry is of particular interest because its ma...

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Bibliographic Details
Published inMaterials characterization Vol. 30; no. 2; pp. 147 - 154
Main Authors Baeslack, W.A., Liu, P.S., Paskell, T.
Format Journal Article
LanguageEnglish
Published New York, NY Elsevier Inc 01.03.1993
Elsevier Science
Subjects
360101 - Metals & Alloys- Preparation & Fabrication
ALLOYS
ALUMINIUM ALLOYS
Applied sciences
ARC WELDING
Cross-disciplinary physics: materials science; rheology
DATA
Exact sciences and technology
EXPERIMENTAL DATA
FABRICATION
GAS METAL-ARC WELDING
GAS TUNGSTEN-ARC WELDING
HEAT AFFECTED ZONE
HEAT TREATMENTS
INFORMATION
JOINING
JOINTS
MATERIALS SCIENCE
Metals. Metallurgy
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
NUMERICAL DATA
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
PHASE TRANSFORMATIONS
Physics
SEGREGATION
SILICON ADDITIONS
SILICON ALLOYS
SOLIDIFICATION
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
WELDED JOINTS
WELDING
ZONES
Heat treatment
Welding
Experimental study
Metastable phase
Solidification
Weld
Phase transformation
Welded joint
Titanium Alloys
Heat affected zone
Microstructure
Micrography
Dendritic structure
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Summary:Beta-21S is a new, metastable-beta titanium alloy (nominal composition, Ti--15Mo--2.7Nb--3Al--0.2Si), which exhibits excellent oxidation resistance and mechanical properties at elevated temperatures. From a weld solidification standpoint, this alloy chemistry is of particular interest because its major beta-stabilizing elements (Mo and Nb) both exhibit equilibrium partitioning ratios (k sub 0 ) greater than unity, indicating their simultaneous partitioning during weld solidification to the initial solid to form (i.e. dendrite cores), and correspondingly their depletion in the final regions of solidification (i.e. dendrite interstices). Such elemental partitioning, if retained down to room temperature, may be expected to promote local variations in the postweld aging response. The objectives of the present investigation were to characterize GTA weld solidification and HAZ liquation phenomena in Beta-21S and to examine the influence of residual microsegregation in the weld zone on alpha precipitation during postweld heat treatment.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:1044-5803
1873-4189
DOI:10.1016/1044-5803(93)90018-Q