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<p>By incorporating Al into the chemical composition of press-hardened steel, its elongation can be significantly improved without compromising strength through the introduction of ferrite and residual austenite into the martensite matrix. Additionally, Al can form a dense oxide layer with oxygen, augmenting the oxidation resistance of press-hardened steel during heat treatment. In this study, two novel PHSs with low and high Al contents were designed to systematically investigate the influence of different Al contents on the microstructure and mechanical properties of press-hardened steel. The two novel PHSs exhibited ultimate tensile strength of 1600&#xa0;MPa and 1520&#xa0;MPa, along with uniform elongation of 4.4% and 7.5%, as well as bending angles of 65.3° and 55.9°, respectively. Interestingly, the analysis of the novel press-hardened steel’s microstructure after tensile and bending deformation revealed distinct strain behaviors of ferrite and martensite during both deformations. Furthermore, it was observed after press hardening processes that the thicknesses of oxide layers in two novel press-hardened steels were 12.7&#xa0;μm and 9.67&#xa0;μm, respectively, attributed to the enrichment of Al and Cr at the bottom of the oxide layer.</p>

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Effect of Al on microstructure and mechanical properties of novel press-hardened steel

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Fengkun Lin,
  • Yuanxiang Zhang,
  • Xiaoming Zhang

摘要

By incorporating Al into the chemical composition of press-hardened steel, its elongation can be significantly improved without compromising strength through the introduction of ferrite and residual austenite into the martensite matrix. Additionally, Al can form a dense oxide layer with oxygen, augmenting the oxidation resistance of press-hardened steel during heat treatment. In this study, two novel PHSs with low and high Al contents were designed to systematically investigate the influence of different Al contents on the microstructure and mechanical properties of press-hardened steel. The two novel PHSs exhibited ultimate tensile strength of 1600 MPa and 1520 MPa, along with uniform elongation of 4.4% and 7.5%, as well as bending angles of 65.3° and 55.9°, respectively. Interestingly, the analysis of the novel press-hardened steel’s microstructure after tensile and bending deformation revealed distinct strain behaviors of ferrite and martensite during both deformations. Furthermore, it was observed after press hardening processes that the thicknesses of oxide layers in two novel press-hardened steels were 12.7 μm and 9.67 μm, respectively, attributed to the enrichment of Al and Cr at the bottom of the oxide layer.