| About this Abstract |
| Meeting |
Superalloys 2024
|
| Symposium
|
Superalloys 2024
|
| Presentation Title |
A-7: Effects of Zirconium Additions on the Microstructure and Stress-rupture Properties in Polycrystalline Ni-base Superalloys |
| Author(s) |
Yang Zhou, Yanna Cui, Bo Wang, Jiamiao Liang, Shuping Li, Jun Wang |
| On-Site Speaker (Planned) |
Yang Zhou |
| Abstract Scope |
In present work, comprehensive investigations were conducted to examine the distribution behavior of the minor alloying element Zr, its impact on microstructural evolution and effect on the high-temperature stress-rupture properties in IN 100 superalloys. The results indicate that the presence of Zr influences the eutectic phase in as-cast alloys, resulting in a reduction in the ă channel width and an increase in both the volume fraction and size of the ă' phase. Through time of flight-secondary ion mass spectrometry and transmission electron microscope analysis, Zr is found to segregate along the eutectic front in the form of Ni5Zr in 900 °C stress-ruptured samples, rendering IN 100 alloys enhanced creep resistance at elevated temperatures. Heat treatment at 1200 °C could effectively eliminate the eutectic structure, thus mitigating the segregation of Zr. A maximum endurance life in IN 100 alloys at 900 °/314 MPa and 950 °/225 MPa is reached when Zr content is approximately 700 ppm. Synergistic effects including the eutectic content, volume fraction and the degree of rafting of the ă' phase together with the dislocation network structure were analyzed and discussed, contributing to the improved stress-rupture properties in IN 100 alloys. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |