About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Materials Design and Processing Optimization for Advanced Manufacturing: From Fundamentals to Application
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Presentation Title |
An Experience in Development of Modified Invar Alloy: Building the Capacity of Overhead Power Transmission Lines |
Author(s) |
Ashmita Patra, Narahari Prasad Satyanarayana, Gayatri Yadav |
On-Site Speaker (Planned) |
Ashmita Patra |
Abstract Scope |
Growing electricity consumption demands multifunctional alloy core in an electrical conductor, doubling the transmission capacity of overhead high voltage lines. Replacement of high strength steel core by modified invar is a thrust area of research to prevent sagging without extra infrastructure construction. Standard invar has high sag resistance due to its very low coefficient of thermal expansion (CTE) (1.1x10-6 upto 200°C) but limited in tensile strength of 800MPa in 90% cold worked condition. Chemistry of standard invar is modified to increase Curie temperature to 240°C and simultaneously strengthen by FCC vanadium carbide precipitation and cold work to obtain 1300MPa tensile strength without impairing ductility and low CTE characteristics. Stoichiometric V/C ratio avoid excess dissolution of carbon or vanadium in the matrix which deteriorates CTE. Aging after optimised % cold reduction promotes coherent precipitate distribution, facilitating strengthening upon further cold working. Fe-Ni-Co-V-C-Cr alloy under present study has achieved UTS>1300MPa keeping CTE<1.8X10-6. |
Proceedings Inclusion? |
Planned: |