Hydrogen blister (HB) and hydrogen-induced cracking (HIC) of pure iron at various charging times were investigated. The results show that an increase in charging time leads to the increased HB height/width and HIC length/depth, and a change in hydrogen damage morphology. Subsurface HIC initiates and propagates along the grain boundaries, which makes the surface bend outwards to form blister on blister features, suggesting grain boundary cracking-induced blister-blister interaction mechanism. Crystallographic analysis demonstrates that adjacent grain boundary oriented-{100}//ND and {110}//ND exhibits the highest susceptibility to HIC, which offers a pathway to design hydrogen-resistant structural steels through the control of grain boundary.

研究了在不同装料时间下纯铁的氢起泡（HB）和氢致裂化（HIC）。结果表明，充电时间的增加导致HB高度/宽度和HIC长度/深度的增加，以及氢损伤形态的改变。地下HIC沿晶界引发并传播，这使表面向外弯曲，在水泡特征上形成水泡，表明晶界开裂诱导了水泡与水泡的相互作用机制。晶体学分析表明，取向为{100} // ND和{110} // ND的相邻晶界对HIC的敏感性最高，这为通过控制晶界设计耐氢结构钢提供了途径。