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采用慢应变速率拉伸方法，研究了Ｆｅ－Ｓｉ试样在空气中拉伸、动态充氢拉伸及在空气中预应变一定量后动态充氢拉伸等实验条件下的断裂过程．结果表明，只有在充氢过程中进行塑性变形才能引起氢致开裂，即塑性变形是氢致开裂的必要条件，氢致开裂过程是氢与位错交互作用的过程．
The fracture process of the Fe-Si samples under air-tension, dynamic hydrogen-tensioning and dynamic hydrogen-tensioning after a certain amount of pre-strain in the air was studied by slow strain rate stretching method. The results show that only plastic deformation during hydrogen charging can cause hydrogen-induced cracking, that is, plastic deformation is a necessary condition for hydrogen-induced cracking. Hydrogen-induced cracking is the interaction between hydrogen and dislocation.