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<p>The article concerns the hot stamping of the B-pillar made of 7075 aluminum alloy. The first tests were carried out on a simple U-shaped element to determine the thermoplastic treatment’s parameters. Cooling the material from 475&#xa0;°C to 120&#xa0;°C at a cooling rate not lower than 62.8&#xa0;°C/s allowed obtaining a high-strength product (above 560&#xa0;MPa, hardness above 175 HV1). The determined parameters were verified while stamping the B-pillar, and the optimization of the process allowed to obtain high dimensional and shape accuracy (below 0.5&#xa0;mm in critical measurement points at the parameters of pressure 0.5 and 3&#xa0;MPa) and good surface quality (roughness Ra &lt; 0.5&#xa0;μm for ester oil-based lubricant for hot forming). The changes in properties were explained by TEM microstructure studies and FEM simulations.The MgZn<sub>2</sub> strengthening precipitates were observed during structural tests, which confirms that all heat treatment processes (solutioning and artificial aging) were performed correctly. Three-point bending tests (crashworthiness) have proved that a hot-formed aluminum pillar absorbs the same energy as a steel pillar (made of 22MnB5, currently used in automobile bodies). A ready-to-use industrial process has been developed that enables the reliable production of any components made of 7075 aluminum.</p>

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Hot forming strategy for lightweight, energy-absorbing B-pillars using 7075 aluminum alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月30日

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  • Mateusz Skwarski,
  • Karol Jaśkiewicz,
  • Sławomir Polak,
  • Zbigniew Gronostajski,
  • Łukasz Dworzak,
  • Krzysztof Śliz,
  • Sławomir Uzar,
  • Sonia Boczkal,
  • Grzegorz Korpała

摘要

The article concerns the hot stamping of the B-pillar made of 7075 aluminum alloy. The first tests were carried out on a simple U-shaped element to determine the thermoplastic treatment’s parameters. Cooling the material from 475 °C to 120 °C at a cooling rate not lower than 62.8 °C/s allowed obtaining a high-strength product (above 560 MPa, hardness above 175 HV1). The determined parameters were verified while stamping the B-pillar, and the optimization of the process allowed to obtain high dimensional and shape accuracy (below 0.5 mm in critical measurement points at the parameters of pressure 0.5 and 3 MPa) and good surface quality (roughness Ra < 0.5 μm for ester oil-based lubricant for hot forming). The changes in properties were explained by TEM microstructure studies and FEM simulations.The MgZn2 strengthening precipitates were observed during structural tests, which confirms that all heat treatment processes (solutioning and artificial aging) were performed correctly. Three-point bending tests (crashworthiness) have proved that a hot-formed aluminum pillar absorbs the same energy as a steel pillar (made of 22MnB5, currently used in automobile bodies). A ready-to-use industrial process has been developed that enables the reliable production of any components made of 7075 aluminum.