Microstructural features of friction welded MA 956 superalloy material
- Pusan Univ. (Korea, Republic of). Dept. of Metallurgical Engineering
- Univ. of Toronto, Ontario (Canada). Dept. of Metallurgy and Materials Science
The microstructural features of MA 956 friction welds were examined using a combination of optical microscopy and transmission electron microscopy (TEM). The MA 956 base material contained a uniform distribution of small diameter (<20 nm) Y{sub 2}O{sub 3} particles. Limited numbers of larger diameter (>100 nm), spherically shaped Al{sub 2}O{sub 3}, Ti(C,N), Y{sub 2}O{sub 3}-Al{sub 2}O{sub 3}, and Al-Ti-Y containing particles were also observed in the MA 956 base material. In the recrystallized region, the grain size was largest at the bondline and increased markedly in the radial direction of the welded joint. Increasing the forging pressure from 50 to 150 MPa during the friction welding operation markedly increased the strain rate and decreased the grain size at the joint centerline. The friction welding operation substantially altered the particle chemistry, dimensions, and shape in the joint region. The number of aluminum-rich or titanium-rich particles was substantially decreased and large irregularly shaped particles were formed.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 438565
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 27, Issue 12; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
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