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<p>The paper presents the results of experimental studies, devoted to investigation of the vibration treatment influence on the defects and structure formation in Fe–28Mn–12Al–0.9Si–1.4C steel as-cast ingots. It is known that high manganese steels, especially with high aluminum concentration, are very prone to shrinkage defects. Vibration treatment of melt during crystallization is an effective method of decreasing defects and refining structure. This method has not been tested on steels with high manganese and aluminum content yet, so an investigation was formed. The main variable treatment parameters were vibration frequency and the melt pouring temperature. For comparative analysis, ingots were obtained without treatment and under three vibration frequencies—12, 24 and 48&#xa0;Hz. Vibration under 24&#xa0;Hz was determined as the optimal, which ensures maximum shrinkage defects elimination and significant grain refinement. It was shown that higher treatment frequency leads to higher grain refinement but causes huge axial shrinkage porosity. Solidus–liquidus temperatures were approximately determined in the range 1300–1350&#xa0;°C. Correspondingly, optimal melt pouring temperature was determined as 1450&#xa0;°C. Elevating melt pouring temperature to 1500 and 1550&#xa0;°C showed inappropriate microstructure changes, which was manifested in massive dendrite forming, grain growth and decreasing of vibration treatment effects. Results show that 24&#xa0;Hz vibration treatment is simultaneously applicable for defects annihilation and structure refining. At the same time, 48&#xa0;Hz treatment leads to best structure refining, but needs to be combined with defects avoiding methods such as gating system optimization or using exothermal parts of mold.</p>

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Some Effects of Low-Frequency Vibration During Solidification of Fe–28Mn–12Al–0.9Si–1.4C Steel As-Cast Ingots

  • 期刊论文

  • 发表日期：

    2025年2月28日

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  • Oleksiy Smirnov,
  • Mykhailo Voron,
  • Andrii Tymoshenko,
  • Yuliia Skorobagatko,
  • Serhiy Schwab,
  • Anastasiia Semenko

摘要

The paper presents the results of experimental studies, devoted to investigation of the vibration treatment influence on the defects and structure formation in Fe–28Mn–12Al–0.9Si–1.4C steel as-cast ingots. It is known that high manganese steels, especially with high aluminum concentration, are very prone to shrinkage defects. Vibration treatment of melt during crystallization is an effective method of decreasing defects and refining structure. This method has not been tested on steels with high manganese and aluminum content yet, so an investigation was formed. The main variable treatment parameters were vibration frequency and the melt pouring temperature. For comparative analysis, ingots were obtained without treatment and under three vibration frequencies—12, 24 and 48 Hz. Vibration under 24 Hz was determined as the optimal, which ensures maximum shrinkage defects elimination and significant grain refinement. It was shown that higher treatment frequency leads to higher grain refinement but causes huge axial shrinkage porosity. Solidus–liquidus temperatures were approximately determined in the range 1300–1350 °C. Correspondingly, optimal melt pouring temperature was determined as 1450 °C. Elevating melt pouring temperature to 1500 and 1550 °C showed inappropriate microstructure changes, which was manifested in massive dendrite forming, grain growth and decreasing of vibration treatment effects. Results show that 24 Hz vibration treatment is simultaneously applicable for defects annihilation and structure refining. At the same time, 48 Hz treatment leads to best structure refining, but needs to be combined with defects avoiding methods such as gating system optimization or using exothermal parts of mold.