Hydrogen embrittlement (HE) is a crucial problem for many advanced high strength steels (AHSS) used in the automotive industry. To contribute to the microstructural understanding on the resistance against hydrogen embrittlement a complex phase (CP) steel and dual phase (DP) steel were investigated systematically in the present work. Both steels have the same tensile strength, but different microstructures. Thermal desorption spectroscopy (TDS) and electrochemical permeation (EP) were used to study the effect of plastic pre-deformation on the chemical diffusivity and solubility. The results were used to parametrize a fully coupled diffusion-mechanical finite element (FE) model. Constant load tests (CLTs) were applied on electrochemical pre-charged notched samples to evaluate the role of hydrogen charging on the mechanical properties. A local evaluation of the CLTs with the fully coupled FE model revealed local limit strain curves (LSC). Comparing these curves yields a very strong effect of the microstructure on the resistivity on hydrogen embrittlement.

氢脆（HE）是许多用于汽车工业的高级高强度钢（AHSS）的关键问题。为了有助于对抗氢脆性的微观结构的理解，在本工作中系统地研究了复相（CP）钢和双相（DP）钢。两种钢具有相同的拉伸强度，但组织不同。用热脱附光谱法（TDS）和电化学渗透法（EP）研究了塑料预变形对化学扩散性和溶解度的影响。结果用于参数化完全耦合的扩散机械有限元（FE）模型。将恒负荷测试（CLT）应用于电化学预充电的带缺口样品，以评估氢气对机械性能的作用。使用完全耦合的有限元模型对CLT进行的局部评估显示了局部极限应变曲线（LSC）。比较这些曲线会产生微观结构对氢脆性电阻率的非常强的影响。