Hot corrosion fatigue characterization of Ni-superalloy C-ring using CT-tomography crystallographic analysis with finite elemental analysis.
- Abstract number
- 336
- Presentation Form
- Poster
- Corresponding Email
- [email protected]
- Session
- Poster Session 3
- Authors
- Dr Maadhav Kothari (1), Dr Laurie Brooking (3), Dr Simon Gray (2), Dr Matthew Andrew (1)
- Affiliations
-
1. Carl Zeiss Microscopy
2. Cranfield University
3. Frazer Nash Consulting
- Keywords
Ni-Superalloy, Crystal Tomography, FEA, Hot Corrosion Fatigue
- Abstract text
Single crystal Ni superalloys are typically are used in power generation and aviation applications due to their unique properties. Recently, incidents of failure due increased temperature around root blade regions has caused Type II hot corrosion leading to cracking in blade roots resulting in catastrophic failure [1]. Understanding the failure mechanism and crack characterisation is vital in solving this industrial issue.
Here we demonstrate a unique workflow of characterization using micro computer tomography, FIB-SEM (figure 1) and laser lamellar preparation in order to characterize crack tips and crack stress in combination with finite elemental analysis.
By extracting the fracture tip, both crystal plasticity and crystal deformity can be studied in detail resulting in orientation tomography of the corroded region of stress. Combining this data with finite elemental analysis we are able to demonstrate a unique technique in c-ring analysis.
Figure 1: Shows the milled out crack region of a C-ring displaying type II hot corrosion.
- References
[1] : L. Brooking, J. Sumner, S. Gray & N. J. Simms (2018) Stress corrosion of Ni-based superalloys, Materials at High Temperatures, 35:1-3, 120-129, DOI: 10.1080/09603409.2017.1392414
