| About this Abstract |
| Meeting |
Superalloys 2024
|
| Symposium
|
Superalloys 2024
|
| Presentation Title |
C-7: Option of HIP Implementation Scheme and its Effects on the Mechanical Properties of a Nickel-based Single-crystal Superalloy |
| Author(s) |
Siliang He, Longfei Li, Song Lu, Yunsong Zhao, Jian Zhang, Qiang Feng |
| On-Site Speaker (Planned) |
Siliang He |
| Abstract Scope |
The micropores and residual eutectic in nickel-based single crystal (SX) superalloys can promote crack initiation in the SX turbine blades during service, threating the components safety. Hot isostatic pressing (HIP) treatment is an effective technique to reduce micropores and enhance the mechanical properties of the alloys. This work investigated the effect of two typical HIP implementation schemes on a nickel-based SX superalloy compared with a conventional heat treatment scheme (without HIP). The results show that the HIP-treated samples had fewer micropores, residual eutectic and better mechanical properties than that of the non-HIP sample. The HIP treatment can increase the yield strength, elongation and reduction in area of tensile properties at 760 °C compared with the non-HIP sample, but had no noticeable effect on that at 980 °C. The HIP treatment on the solution-treated sample enhanced the creep rupture life more than that of the as-cast sample at 980 °C/ 250 MPa, but had no influence on it at 1100 °C/ 130 MPa. The HIP effect on the fatigue rupture cycles was closely related to the type of crack initiation site. The HIP treatment significantly prolonged the rupture cycles of low-cycle fatigue (LCF) at 760 °C and high-cycle fatigue (HCF) at 850 °C of HIP-treated samples by changing the crack initiation sites, but had no impact on that at 980 °C. Comparing different HIP implementation schemes on microstructures and comprehensive mechanical properties, the HIP treatment on the solution-treated sample was better than that on the as-cast sample. This work can improve the mechanical properties and provide guidance for HIP implementation scheme of nickel-based SX superalloys. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |