Study of Heat Treatment Regimes During Production of a New Generation of Invar Alloys

Recently in order to create new generation technology there is extensive use of materials based on multifunctional alloys with special physicomechanical properties. This concerns Invar alloy materials, exhibiting minimum thermal expansion values with high strength properties (σu and HV). Scientists of the Magnitogorsk State Technical University together with specialists of the Motovilikhinskie Zavody company (Perm) are implementing a project for creating a mini-plant for manufacturing billets of innovative high-strength Invar class multifunctional alloys. On the example of Invar alloy of the Fe–Ni–Co–V–C system results are presented in this article for the effect of heat treatment regimes on test alloy structure formation and thermal expansion. A fundamental production scheme is demonstrated applied to Motovilikhinskie Zavody conditions for manufacturing nanostructured billets of a new generation of multifunctional alloys, providing the achievement of an increased level of mechanical properties (σu ≈ 1100 MPa) and anomalously low values of linear thermal expansion coefficient (LTEC ≤ 1·10–6 K–1).