Complex modification of heat-resistant ZhS3DK-VІ alloy with yttrium and titanium carbonitride

Keywords

heat-resistant nickel alloy, cast sample, chemical composition, modification, yttrium, titanium carbonitride, hot isostatic pressing, macro- and microstructure, mechanical properties, impact toughness, long-term strength.

Cite as

Danilov S. M., Tomkin D. O., Pedash O. O., Naumyk O. O., and Naumyk V. V. Complex modification of heat-resistant ZhS3DK-VІ alloy with yttrium and titanium carbonitride. Physicochemical Mechanics of Materials. 2024. 60(3), 137-143.

https://doi.org/10.15407/pcmm2024.03.137

Abstract

Samples cast from heat-resistant nickel ZhS3DK-VІ alloy, complex modified with yttrium and titanium carbonitride in various combinations, after hot isostatic pressing (HIP) and subsequent heat treatment, were investigated. For comparison, complex modifi­cation was performed with the simultaneous use of yttrium and cerium. It was established that the chemical composition (taking into account the presence of yttrium in the alloys), as well as the mechanical and heat-resistant properties of the cast samples meet the requi­rements of OST 1.90.126-85, with the exception of the impact ductility of the samples without titanium carbonitride, which is almost twice lower than the additional require­ments put forward by the developer for responsible aircraft castings, and also for the sam­ples with titanium carbonitride. The best modifying effect was obtained with the complex modified alloy with 0.075% titanium carbonitride. In other options, there is a coarse­ning of the structure, and for the samples without titanium carbonitride, melting of the eutectic (γ-γ)′-phase is also observed, which probably contributs to the reduction of im­pact toughness. As a result of HIP, micropores and loosening which do not reach the surface of the parts (located in the internal volumes of the metal) are healed, which contributes to the stabili­zation of the  material structure and properties.

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