Hot-Corrosion Behaviour of NiCoCrW Superalloy Fabricated by Selective Laser Melting
Abstrak
In this study, a NiCoCrW (K447A) superalloy was fabricated using selective laser melting (SLM). The hot-corrosion behaviour of the SLM-fabricated NiCoCrW (K447A) was investigated in Na<sub>2</sub>SO<sub>4</sub> at 900 °C. Microstructural analysis and hot-corrosion testing revealed its anisotropic behaviour in different build directions. The corrosion resistance along the build direction (XOY plane) was superior to that perpendicular to the build direction (YOZ plane). The stability of grain boundaries in the XOY plane is enhanced by the fine grains and a larger carbide area fraction, effectively hindering the diffusion of S and O<sub>2</sub> at grain boundaries. Furthermore, the more uniform distribution of carbides in the XOY plane reduces the local stress concentration, contributing to the stability of the protective oxide film. The enhanced hot-corrosion resistance is attributed to the formation of a more continuous and dense corrosion layer on the XOY surface.
Topik & Kata Kunci
Penulis (6)
Bo Han
Tao Dong
Geng Liu
Jie Su
Wenchao Yu
Ao Wang
Akses Cepat
- Tahun Terbit
- 2025
- Sumber Database
- DOAJ
- DOI
- 10.3390/met15040338
- Akses
- Open Access ✓