Metallurgical assessment of large size tensioning components for the precompression structure of the ITER central solenoid

• An adapted fabrication and processing route including vacuum induction melting (VIM) and electroslag remelting (ESR) or vacuum arc remelting (VAR), combined with hot transformation steps involving where applicable redundant multidirectional forging, was successfully applied to the production of inconel 718 large size tensioning components for the precompression structure of the ITER central solenoid. • Material production involved a wide variety of gauges and product shapes, whose final properties are very consistent thanks to a repeatable and well mastered production process. • The material of tensioning components is submitted to a tight specification. Products feature an outstanding cleanliness, fineness and homogeneity of the microstructure, as confirmed by extensive macro and microscopic observations, which enable final properties to meet or exceed specification requirements.