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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium High Temperature Creep Properties of Advanced Structural Materials
Presentation Title Threshold Creep Behaviour of Ni-based Superalloy IN740H
Author(s) Chandan Kumar, Pavan A.H.V., Praveen Kumar
On-Site Speaker (Planned) Praveen Kumar
Abstract Scope Creep deformation of nickel-based superalloy IN740H was studied at temperatures of 750 and 800 °C. The samples were aged at 800 °C after solution-treatment from 4 to ~10,000 h. The tests were performed in compression at a stress in the range of 200 to 450 MPa. The apparent stress exponent, n, changed from 4.5 at 800 °C to 10 at 750 °C. However, effect of prior aging was not observed on the stress exponent. The apparent activation energy, Qc, was calculated to be 565 kJ/mol. The high values of apparent n at 750 °C and Qc suggest a threshold behaviour, i.e., a critical stress value below which creep would not occur. By applying the concept of threshold stress, the true stress exponent and activation energy were calculated to be 4 and 298 kJ/mol, respectively. Subsequently, structure-property correlation was established using transmission electron microscopy and atom probe tomography.
Proceedings Inclusion? Planned:
Keywords Mechanical Properties, High-Temperature Materials, Other

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Microstructure Sensitive Model to Account for the Non-isothermal Creep Behavior of Ni-based Single Crystal Superalloys
CALPHAD Alloy Design for Diffusion-mediated Plasticity-Induced Phase Transformations for Creep Resistant Multicomponent Principal Elemental Alloy
Creep and Creep-ratcheting Behaviour of Selective Laser Melted (SLM) Additively Manufactured (AM) Inconel 718
Creep and Tensile Properties of Five Novel, Computationally Designed Ni-based SX Superalloys
Creep Behavior at Elevated Temperatures of Several Polycristalline Ni-based Superalloys Strengthened by MC-carbides
Creep Behaviors of High-entropy Alloys
Creep Ratcheting of a HP+NbW (MA) Steam Methane Reformer Tube Alloy
Creep Simulations of Refractory High Entropy Alloys
Crystal Plasticity Creep Modeling in Cobalt Based Superalloys
Effect of Alloying Additions on Twinning in Ni-based Superalloys
Effect of the Casting Process on the Microstructure and Creep Properties of a Cast Ni-Based Alloy
F-1: A Study on Microstructure and Mechanical Properties of Fe-Cr-Ni-Al-V Alloys
F-2: Effects of Controlling Ti and Al on Microstructure and Mechanical Properties of Fe-Cr-Co-Al-Ti Ferritic Alloys
F-3: Strengthening Against Creep at Elevated Temperature of HEA Alloys of the CoNiFeMnCr Type Using MC-carbides
Induction of Alternative Shearing Pathways during Creep Deformation of Nickel Based Superalloys via Local Phase Transformation Strengthening
Mechanisms of Creep in Additively Manufactured NiCoCr and ODS-NiCoCr Multi-principal Element Alloys
Role of Cr Content on Creep-rupture Performance in Alumina-forming Austenitic Alloys
The Elevated Temperature Creep, Fatigue, and Fracture Behavior of Nickel-based Superalloys Manufactured by Direct Metal Laser Sintering
Thermal Creep Models Derived from a Comprehensive Multiple Heat 9Cr Tempered Martensitic Steels Database
Threshold Creep Behaviour of Ni-based Superalloy IN740H

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