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<p>Knowledge of the interfacial heat transfer coefficient (HTC) during automotive hot stamping is crucial for predicting the microstructure and associated mechanical properties of the as-formed part<b>.</b> In this work, aluminum–silicon (Al-Si) coated 22MnB5 steel blanks were hot stamped in a hydraulic press equipped with flat steel dies instrumented with a pyrometer to measure blank surface temperature and subsurface thermocouples. Two Al-Si coating weights were considered: 80&#xa0;g/m<sup>2</sup> and 150&#xa0;g/m<sup>2</sup>. An inverse heat conduction analysis was performed on subsurface temperature data to infer the surface heat flux and die surface temperatures. As interfacial pressure increased, time-averaged HTCs increased before saturating between 6 and 10&#xa0;MPa. In principle, the HTC is impacted by both the thickness and roughness of the intermetallic layer. It was observed that longer furnace dwell times led to thicker intermetallic coatings by ~ 10 µm but did not affect roughness or the HTC. Higher coating weights corresponded to a rougher surface out of the furnace, and lower HTCs within the press by 16% and 19% at furnace dwell times of 6 and 12&#xa0;min, respectively. This suggests that the roughness of the intermetallic coating, and not its thickness, governs the HTC in the hot stamping of Al-Si coated 22MnB5 steel.</p>

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Influence of the coating on the interfacial heat transfer coefficient in hot stamping of Al-Si coated 22MnB5 steel

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Ardhendu S. Bhattacharya,
  • Kedar N. Adhvaryu,
  • Arpan R. Singh,
  • Cliff Butcher,
  • Kyle J. Daun

摘要

Knowledge of the interfacial heat transfer coefficient (HTC) during automotive hot stamping is crucial for predicting the microstructure and associated mechanical properties of the as-formed part. In this work, aluminum–silicon (Al-Si) coated 22MnB5 steel blanks were hot stamped in a hydraulic press equipped with flat steel dies instrumented with a pyrometer to measure blank surface temperature and subsurface thermocouples. Two Al-Si coating weights were considered: 80 g/m2 and 150 g/m2. An inverse heat conduction analysis was performed on subsurface temperature data to infer the surface heat flux and die surface temperatures. As interfacial pressure increased, time-averaged HTCs increased before saturating between 6 and 10 MPa. In principle, the HTC is impacted by both the thickness and roughness of the intermetallic layer. It was observed that longer furnace dwell times led to thicker intermetallic coatings by ~ 10 µm but did not affect roughness or the HTC. Higher coating weights corresponded to a rougher surface out of the furnace, and lower HTCs within the press by 16% and 19% at furnace dwell times of 6 and 12 min, respectively. This suggests that the roughness of the intermetallic coating, and not its thickness, governs the HTC in the hot stamping of Al-Si coated 22MnB5 steel.