Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 46, Issue -, Pages 1-11Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.11.015
Keywords
Isothermal compression bonding; Dynamic recrystallization; Microstructures; Grain boundary; Misorientation
Funding
- National Key Research and Development Program [2018YFA0702900]
- National Natural Science Foundation of China [U1508215, 51774265]
- National Science and Technology Major Project of China [2019ZX06004010]
- Key Program of the Chinese Academy of Sciences [ZDRW-CN-2017-1]
- CAS Interdisciplinary Innovation Team
Ask authors/readers for more resources
As an advanced solid state bonding process, plastic deformation bonding (PDB) is a highly reliable metallurgical joining method that produces significant plastic deformation at the bonding interface of welded joints through thermo-mechanical coupling. In this study, PDB behavior of IN718 superalloy was systematically investigated by performing a series of isothermal compression tests at various processing conditions. It was revealed that new grains evolved in the bonding area through discontinuous dynamic recrystallization (DDRX) at 1000-1150 degrees C. Electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) results revealed that the bonding of joints is related with interfacial grain boundary (IGB) bulging process, which is considered as a nucleation process of DRXed grain under different deformation environments. During recrystallization process, the bonded interface moved due to strain-induced boundary migration (SIBM) process. Stored energy difference (caused by accumulation of dislocations at the bonding interface) was the dominant factor for SIBM during DRX. The mechanical properties of the bonded joints were dependent upon the recrystallized microstructure and SIBM ensued during PDB. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available