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<p>The term “Monday morning” iron refers to metal that has been held in a furnace over an extended period, typically over a weekend. A key characteristic of these irons is their poor potential for graphite nucleation, often accompanied by a high amount of undercooled graphite. Foundries face a labor-intensive process to enhance the quality of this metal before casting. The undesirable microstructure is commonly attributed to the loss of carbon, that is, a change in the melt’s chemistry. In this context, the current study examines the role of micro-inclusions in Monday morning irons under three conditions: after a prolonged holding time, following the addition of new carbon, and when the metal is ready for production use. The findings reveal that the poor nucleation condition is not due to carbon loss, but rather to a lower number density of micro-inclusions, especially sulfides. Additionally, there is a notable change in sulfide morphology, with the particles in the ready iron being rounder.</p>

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Characteristics of “Monday Morning” Base Iron

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月29日

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  • Cathrine Hartung,
  • Bente Kroka,
  • Robert Schmidt,
  • Mike Riabov,
  • David Kesse,
  • Leander Michels

摘要

The term “Monday morning” iron refers to metal that has been held in a furnace over an extended period, typically over a weekend. A key characteristic of these irons is their poor potential for graphite nucleation, often accompanied by a high amount of undercooled graphite. Foundries face a labor-intensive process to enhance the quality of this metal before casting. The undesirable microstructure is commonly attributed to the loss of carbon, that is, a change in the melt’s chemistry. In this context, the current study examines the role of micro-inclusions in Monday morning irons under three conditions: after a prolonged holding time, following the addition of new carbon, and when the metal is ready for production use. The findings reveal that the poor nucleation condition is not due to carbon loss, but rather to a lower number density of micro-inclusions, especially sulfides. Additionally, there is a notable change in sulfide morphology, with the particles in the ready iron being rounder.