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- Title
MICROSTRUCTURE OF BRAZED JOINTS OF NICKEL ALUMINIDE.
- Authors
MAKSYMOVA, S. V.; KHORUNOV, V. F.; MYASOED, V. V.; VORONOV, V. V.; KOVALCHUK, P. V.
- Abstract
Intermetallic alloys on the base of Ni3Al and NiAl phases belong to the new class of challenging casting structural materials. Application of Ni3Al-based materials allows increasing the service life of parts by 3-4 times, working temperatures of turbine inlet gas by 50-100 °C, reducing the mass of turbines and, as a consequence, increasing their specific thrust and efficiency. The wide application of alloys on Ni3Al base in industry requires the development of technological processes of producing permanent joints, including method of brazing, as the alloys, containing a high percent of γ'-phase, are referred to the class of hard-to-weld ones due to possible crack formation. At present, the nickel brazing filler alloys (BFA), containing silicon and boron as depressants, are used for brazing high-temperature high-alloy nickel alloys, thus leading to formation of brittle phases (silicides, borides) in joints, having a negative influence on fatigue life. Their elimination is connected with long-time conditions of heat treatment or almost impossible. The present work shows the possibility of application of eutectic BFA on nickel base, not containing boron and silicon. The results of metallographic examinations and X-ray spectral microanalysis of brazed joints of intermetallic alloys on the base of γ'-phase (Ni3Al) are given. Shown are the morphological peculiarities of structure formation of brazed joints, produced by high-temperature vacuum brazing and BFA on base of Ni-Cr-Zr and Ni-Co-Cr-W-Mo-Al-Nb-B systems.
- Subjects
MICROSTRUCTURE; BRAZED joint testing; NICKEL-aluminum alloys; CASTING (Manufacturing process); BRAZING
- Publication
Paton Welding Journal, 2014, Issue 10, p15
- ISSN
0957-798X
- Publication type
Article
- DOI
10.15407/tpwj2014.10.03