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<p>This study investigates the sensitivity of the Magnetic Barkhausen Noise (MBN) technique for the nondestructive evaluation of microstructural changes and hardness variations in the 22MnB5 high strength steel subjected to different heat treatment conditions. For this purpose, tempering experiments were performed on multiple samples of 22MnB5 steel with an aluminum–silicon coating, using different cooling conditions to promote the formation of distinct microstructural states. MBN measurements were conducted to analyze the influence of these conditions on the magnetic response of the material. The results indicated that the MBN signal profiles exhibit distinct patterns for each cooling condition, particularly the position and amplitude of the envelope peaks, indicating changes in phase composition and hardness. Furthermore, the presence of the aluminum–silicon coating influenced the magnetic response due to the formation of an interfacial layer during the heat treatment. These findings demonstrate that the MBN technique is an effective nondestructive tool for monitoring thermally induced microstructural changes in advanced high-strength steels.</p>

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Magnetic Barkhausen Noise Evaluation of 22MnB5 High Strength Steel Microstructure After Heat Treatment

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月2日

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  • Matheus Passos Sarmento Santos,
  • Freddy Armando Franco Grijalba,
  • Marcos Flavio de Campos,
  • Paula Fernanda da Silva Farina

摘要

This study investigates the sensitivity of the Magnetic Barkhausen Noise (MBN) technique for the nondestructive evaluation of microstructural changes and hardness variations in the 22MnB5 high strength steel subjected to different heat treatment conditions. For this purpose, tempering experiments were performed on multiple samples of 22MnB5 steel with an aluminum–silicon coating, using different cooling conditions to promote the formation of distinct microstructural states. MBN measurements were conducted to analyze the influence of these conditions on the magnetic response of the material. The results indicated that the MBN signal profiles exhibit distinct patterns for each cooling condition, particularly the position and amplitude of the envelope peaks, indicating changes in phase composition and hardness. Furthermore, the presence of the aluminum–silicon coating influenced the magnetic response due to the formation of an interfacial layer during the heat treatment. These findings demonstrate that the MBN technique is an effective nondestructive tool for monitoring thermally induced microstructural changes in advanced high-strength steels.