| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
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Recent Advances in Titanium Science and Technology: MPMD/SMD Symposium Honoring Professor Dipankar Banerjee
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| Presentation Title |
High-Temperature Deformation and Damage Behavior a γʹ-Lean Ni-based Superalloy: A Case Study of IN740H |
| Author(s) |
Chandan Kumar, Praveen Kumar |
| On-Site Speaker (Planned) |
Praveen Kumar |
| Abstract Scope |
A need for high efficiency and advancements in thermal power plant technologies necessitate operations at steam temperatures of 760 °C and pressures of 35 MPa. Under such high-temperature and high-pressure conditions, a transition from currently used steels to Ni-based superalloys, which have conventionally been used in aero-engines, for boilers is required for long-term structural integrity. Here, we highlight the phenomena of temperature- and strain-dependence of dynamic strain aging, strain rate- and temperature-dependence of yield strength anomaly, temperature-dependence of threshold creep behavior, and strain-dependence of creep-fatigue interaction at high temperatures (up to 800 °C) in a polycrystalline Ni-based superalloy IN740H, which contains a low volume fraction of γ′ (~25%) and is considered for fabricating boilers in the advanced supercritical power plants. Comprehensive microstructure evolution has been performed to establish structure-property relationships and to highlight the common theme of controlling the high-temperature deformation and damage evolution in a γʹ-lean Ni-based superalloy. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Copper / Nickel / Cobalt, High-Temperature Materials, Mechanical Properties |