Hydrogen enhanced the activity and multiplication of dislocation, so that initiation and propagation of the micro cracks were affected.
氢促进了位错的运行与增殖，从而影响裂纹的萌生与扩展。
Repeated impact can intensify the mobility of atom, reduce critical shear stress, and make the enablement and multiplication of dislocation easy.
多次冲击使原子易动性增强，临界切应力下降，位错易于启动和增殖。
It is because of microstructure refinement, an increase in boundaries and dislocation multiplication.
阻尼性能提高是由于组织细化、界面增多以及位错增殖所致。
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