Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 702, Issue -, Pages 343-349Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.07.025
Keywords
Ni-base superalloy; Microstructure; Size effect; Deformation mechanisms; Tensile strength
Categories
Funding
- Strategic Emerging Industry Project of Sichuan Province [SC201351010620]
Ask authors/readers for more resources
A new directionally solidified Ni-base superalloy, M4706, containing three different model microstructures is obtained via changing aging heat treatments. After tensile deformation at 650 degrees C, the microstructures are investigated by scanning electron microscope and transmission electron microscope. Experimental results reveal that the tensile strength decreases gradually with increasing mean gamma' precipitate size from 424 to 734 nm, and plastic deformation is accomplished mainly by dislocations shearing of gamma' precipitates in all three microstructures. Meanwhile, it is also found that as the precipitate size increases, more and more dislocations pass through both gamma and gamma' phases in groups in the slightly deformed specimens. Based on these results, it is deemed that the occurrence of this deformation pattern accounts for the degeneration of the yield strength with precipitate size.
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