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Abstract <p>Porosity in the materials of parts has different morphology and localization, but the phenomenology and the mechanisms of pore nucleation generally have a similar physical origin. GOST 19200 defines the following types of porosity: gas, shrinkage, and graphite. For macroporosity, a semi‑empirical criterion for porosity formation is introduced, reflecting the fact that individual volumes of melt may become isolated from the bulk liquid phase and will not be fed by the melt. For microporosity, the Niyama criterion is used. An assessment of the structural defectiveness of processed materials is proposed based on the content of diffusible hydrogen.</p>

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Influence of Alloy Porosity on the Phenomenology of Defect Formation and Fracture of Component Materials

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • A. V. Ragutkin,
  • M. E. Stavrovskiy,
  • I. M. Sidorov,
  • E. S. Postnikova,
  • S. V. Aleksandrova,
  • V. A. Vasil’yev

摘要

Abstract

Porosity in the materials of parts has different morphology and localization, but the phenomenology and the mechanisms of pore nucleation generally have a similar physical origin. GOST 19200 defines the following types of porosity: gas, shrinkage, and graphite. For macroporosity, a semi‑empirical criterion for porosity formation is introduced, reflecting the fact that individual volumes of melt may become isolated from the bulk liquid phase and will not be fed by the melt. For microporosity, the Niyama criterion is used. An assessment of the structural defectiveness of processed materials is proposed based on the content of diffusible hydrogen.