Interface microstructures in the diffusion bonding of a titanium alloy Ti 6242 to an Inconel 625

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02664680· OSTI ID:6875371

Aleman, B; Gutierrez, I; Urcola, J J ^[1]

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1. Centro de Estudios e Investigaciones Tecnicos de Guipuzcoa, San Sebastian (Spain). Dept. of Materials

Surveys carried out by some oil companies have shown a recent and clear trend toward drilling wells to greater depths. As the drilling for oil and gas gets deeper, the requirements of materials for tubing become more stringent, due to the rise in temperature and pressure and also because the tubes have to sustain their own weight. In this paper, Ti6242 alloy has been diffusion bonded to a superalloy INCONEL 625. The microstructures of the as-processed products have been analyzed using optical metallography, scanning electron microscope (SEM), and scanning transmission electron microscope (STEM) techniques. The interdiffusion of the different elements through the interface has been determined using energy-dispersive spectroscopy (EDS) microanalysis in both a SEM and a STEM. Several regions around the original interface have been observed. Starting from the superalloy INCONEL 625, first a sigma phase (Cr[sub 4]Ni[sub 3]Mo[sub 2]), followed by several phases like NbNi[sub 3], [eta]Ni[sub 3]Ti, Cr(20 pct Mo), [beta] Cr[sub 2]Ti, NiTi, TiO, TiNi, and Ti[sub 2]Ni intermetallics, just before the Ti6242 have been identified. Because the diffusion of Ni in Ti is faster than the diffusion of Ti in the superalloy, a Kirkendall effect was produced. The sequence of formation of the different phases were in agreement with the ternary Ti-Cr-Ni diagram.

• OSTI ID: 6875371
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 26:2; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300 -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOY-NI61CR22MO9NB4FE3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
BONDING
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
DATA
DIAGRAMS
EQUIPMENT
EXPERIMENTAL DATA
FABRICATION
FIELD PRODUCTION EQUIPMENT
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL 625
INCONEL ALLOYS
INFORMATION
INTERFACES
INTERMETALLIC COMPOUNDS
IRON ALLOYS
JOINING
MATERIALS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NATURAL GAS WELLS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM AL
NUMERICAL DATA
OIL WELLS
PHASE DIAGRAMS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
WELLS