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<p>A&#xa0;method for assessing the mechanical properties and deformation capacity of the high-temperature area of the heat-affected zone (HAZ) during fusion welding of the ZhS6-type hard-to-weld polycrystalline nickel-based alloys was developed. The proposed method is based on the use of miniature flat proportional two-layer test pieces, cut from a&#xa0;nickel-based superalloy plate with a&#xa0;single layer of the deposited metal on its edge. The gauge section of such a&#xa0;specimen contains longitudinally interfused layers of the base metal and the highly ductile surfaced metal of Inconel 625 alloy. Through longitudinal tensile testing of such specimens within the temperature range of 20–1100 °C, the critical fracture strain for the high-temperature area of the HAZ was experimentally determined, and the corresponding ultimate tensile strength was calculated. At temperatures of 600–1000 °C, the high-temperature area (HTA) of the HAZ in ZhS6U and ZhS6K nickel-based superalloys exhibits a&#xa0;low-ductility state, with a&#xa0;critical fracture strain of 0.3–1 %. The obtained results expand the understanding of the hot crack formation mechanism during fusion welding, compared to previous studies carried out using the standard Varestraint test method.</p>

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Evaluation of the mechanical properties of the high-temperature area in the heat-affected zone during deposition of a difficult-to-weld nickel-based superalloy

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • O. V. Yarovytsyn,
  • M. O. Cherviakov,
  • H. D. Khrushchov,
  • I. R. Volosatov

摘要

A method for assessing the mechanical properties and deformation capacity of the high-temperature area of the heat-affected zone (HAZ) during fusion welding of the ZhS6-type hard-to-weld polycrystalline nickel-based alloys was developed. The proposed method is based on the use of miniature flat proportional two-layer test pieces, cut from a nickel-based superalloy plate with a single layer of the deposited metal on its edge. The gauge section of such a specimen contains longitudinally interfused layers of the base metal and the highly ductile surfaced metal of Inconel 625 alloy. Through longitudinal tensile testing of such specimens within the temperature range of 20–1100 °C, the critical fracture strain for the high-temperature area of the HAZ was experimentally determined, and the corresponding ultimate tensile strength was calculated. At temperatures of 600–1000 °C, the high-temperature area (HTA) of the HAZ in ZhS6U and ZhS6K nickel-based superalloys exhibits a low-ductility state, with a critical fracture strain of 0.3–1 %. The obtained results expand the understanding of the hot crack formation mechanism during fusion welding, compared to previous studies carried out using the standard Varestraint test method.