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<p>Cast samples of heat-resistant ZhS3DK-VI nickel alloy modified with yttrium in combination with titanium carbonitride or niobium were studied. The chemical composition of the samples is satisfactory and meets the requirements of OST 1.90.126-85. The heat resistance, strength, and ductility characteristics of the studied samples, after hot isostatic pressing and standard heat treatment, meet the regulatory requirements. The impact toughness value of the alloy containing niobium is slightly below the developer’s requirements but remains within regulatory standards. In the microstructure of the alloy with titanium carbonitride, the grain boundaries are mainly thin with the presence of carbides with a&#xa0;size not exceeding 4 μm, as well as carbonitrides in the form of globular clusters near the grain boundaries. As for the alloy with niobium, the grain boundaries are coarser due to the release of carbonitrides up to 7 μm in size, as well as plate-like carbides up to 10 μm. Thus, complex modification with yttrium and titanium carbonitride ensures the formation of a&#xa0;more favorable structure, significantly improving the mechanical and heat-resistant properties of the ZhS3DK-VI nickel alloy.</p>

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Complex modification of heat-resistant ZhS3DK-VI alloy with yttrium and titanium carbonitride, and niobium

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • D. O. Tomkin,
  • O. O. Pedash,
  • O. O. Naumyk,
  • V. V. Naumyk

摘要

Cast samples of heat-resistant ZhS3DK-VI nickel alloy modified with yttrium in combination with titanium carbonitride or niobium were studied. The chemical composition of the samples is satisfactory and meets the requirements of OST 1.90.126-85. The heat resistance, strength, and ductility characteristics of the studied samples, after hot isostatic pressing and standard heat treatment, meet the regulatory requirements. The impact toughness value of the alloy containing niobium is slightly below the developer’s requirements but remains within regulatory standards. In the microstructure of the alloy with titanium carbonitride, the grain boundaries are mainly thin with the presence of carbides with a size not exceeding 4 μm, as well as carbonitrides in the form of globular clusters near the grain boundaries. As for the alloy with niobium, the grain boundaries are coarser due to the release of carbonitrides up to 7 μm in size, as well as plate-like carbides up to 10 μm. Thus, complex modification with yttrium and titanium carbonitride ensures the formation of a more favorable structure, significantly improving the mechanical and heat-resistant properties of the ZhS3DK-VI nickel alloy.