Theoretical Foundations of the Use of Severe Plastic Deformation for Formation of Ultrafine Grain Structure in Superalloys

• Published in: Journal of machinery manufacture and reliability Vol. 50; no. Suppl 1; pp. S15 - S22
• Main Authors: Utyashev, F. Z., Sukhorukov, R. Yu, Valitov, V. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2021; Springer Nature B.V
• Subjects: Disintegration; Disks; Engineering; Gas turbine engines; Grain structure; Iron constituents; Machines; Manufacturing; Parameter estimation; Plastic deformation; Processes; Reliability; Strength; Superalloys; Superplastic deformation; Superplasticity; Ultrafines; Wear Resistance of Machines and Structures; Workpieces; upsetting with torsion; deformation-induced boundaries; grain boundary sliding; superplasticity; superalloys; combined deformation
• ISSN: 1052-6188; 1934-9394
• DOI: 10.3103/S1052618821090144

— Parts of gas turbine engines from superalloys on the basis of nickel and iron are fabricated using superplastic deformation of ultrafine-grained semi-fabricated products. This article provides theoretical substantiation of the efficient process of severe plastic deformation for achievement of an ultrafine grain structure in disks and rods from superalloys. The possibility of accumulating the degree required for grain disintegration in workpieces under the conditions of combined deformation, mainly due to the contribution of a rotational constituent, is demonstrated. The analytical dependences of the stressed and strained state of superalloys under the conditions of combined deformation are obtained, and the required energy parameters are estimated.