Two different thermo-mechanical controlled process procedures were utilized to modify the microstructure and texture of pipeline steel. Moreover, electrochemical hydrogen charging and hydrogen permeation experiments were used to investigate the effect of texture and microstructure on the HIC susceptibility of tested specimens. The results showed that different used TMCP parameters did not change the microstructure of the tested specimens significantly. It was also concluded that the higher number of reduction steps led to the generation of smaller grains with the same total reduction percentage. The cooling rate was another factor affecting the grain size in which a higher cooling rate resulted in smaller grain size. The hydrogen charging results illustrated that the increase of the grain size led to better resistance of the steel to the HIC cracking. It was observed that the specimen containing a higher density of reversible traps seems to be more susceptible to HIC cracking.

两种不同的热机械控制工艺程序被用来改变管线钢的微观结构和织构。此外，电化学充氢和氢渗透实验被用来研究织构和微观结构对测试样品的 HIC 敏感性的影响。结果表明，不同使用的TMCP参数不会显着改变测试样品的微观结构。还得出的结论是，在总压下率相同的情况下，更多的还原步骤会导致生成更小的晶粒。冷却速度是影响晶粒尺寸的另一个因素，其中较高的冷却速度导致较小的晶粒尺寸。充氢结果表明，晶粒尺寸的增加导致钢更好地抵抗 HIC 开裂。据观察，含有更高密度可逆陷阱的试样似乎更容易发生 HIC 开裂。