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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Materials Design and Processing Optimization for Advanced Manufacturing: From Fundamentals to Application
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:

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