Hot Isostatic Pressing in the Manufacture of ZhS3DK-VI Alloy Turbine Blades with 50% Returns in the Charge

• Published in: Strength of materials Vol. 54; no. 6; pp. 1043 - 1049
• Main Authors: Klochykhin, V. V., Pedash, O. O., Danilov, S. M., Tyomkin, D. O., Naumyk, O. O., Naumyk, V. V.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.11.2022; Springer; Springer Nature B.V
• Subjects: Alloys; Characterization and Evaluation of Materials; Chemical composition; Chemistry and Materials Science; Classical Mechanics; Heat resistant alloys; Heat treating; Heat treatment; Hot isostatic pressing; Materials Science; Melting; Metal products; Microporosity; Nickel alloys; Nickel base alloys; Power plants; Solid Mechanics; Specialty metals industry; Turbine blades; Turbines; hot isostatic pressing; turbine blade; heat-resistant nickel alloy; returns; heat resistance; chemical composition; structure; mechanical properties
• ISSN: 0039-2316; 1573-9325
• DOI: 10.1007/s11223-023-00479-7

The quality of the blade material and specimens cast from a ZhS3DK-VI heat-resistant nickel alloy with 50% returns in the charge (after preliminary remelting), subject to hot isostatic pressing (HIP) and standard heat treatment, was evaluated. It is established that the chemical composition, macroand microstructure, mechanical and heat-resistant properties of the casting material meet the requirements of standard specifications and engineering documentation. The bending angle on the blades was found to be within 88–126° (according to the OST 1.90.126-85 requirements, it should be no less than 20°). Hot isostatic pressing of the blades at 1210°C and 160 MPa brings about the healing of microporosity and looseness that do not come out at the surface of the componenti (located in the bulk of the metal). The structure of the turbine blades after HIP is practically free of micropores, which contributes to the stabilization of the structure and properties of the material. Single micropores detected after HIP are more than 40 times smaller compared to those revealed in the cast blades before HIP. Thus, it supports the feasibility of fabricating the turbine blades with 50% returns in the charge. Hot isostatic pressing before standard heat treatment is shown to positively influence the complex of physical, mechanical, and service properties of critical cast products from heatresistant nickel alloys for aviation and power plants.