Improved safety standards and reduced automotive body-in-white weight have led to a strong interest in martensitic press hardening steel (PHS). As the sensitivity to hydrogen embrittlement of martensite increases at higher strength level, the very small uptake of diffusible hydrogen by aluminized PHS during the austenitization stage of the hot press forming process is of concern. The hydrogen uptake was found to reduce the plasticity of the PHS considerably. The PHS with a higher strength was more susceptible to hydrogen-induced brittle fracture. The present work reports that vanadium additions, which serve to trap the hydrogen, considerably reduce the negative impact of the hydrogen uptake in aluminized 1800 MPa and 2000 MPa PHSs. The contribution also proposes a mechanism for the uptake of hydrogen during the processing of aluminized PHS.

更高的安全标准和减少的汽车白车身重量引起了人们对马氏体冲压硬化钢（PHS）的浓厚兴趣。随着对马氏体氢脆性的敏感性在较高的强度水平下增加，在热压成型过程的奥氏体化阶段，渗铝的PHS对极少量的可扩散氢的吸收是值得关注的。发现吸收氢会大大降低PHS的可塑性。具有较高强度的PHS更容易受到氢引起的脆性断裂的影响。本工作报告说，钒的添加可以捕集氢，大大降低了镀铝的1800 MPa和2000 MPa的PHS中氢吸收的负面影响。该文稿还提出了一种在铝化PHS加工过程中吸收氢的机制。