Herein, the effect of multiple laser shock peening (LSP) on fatigue performance of aluminized steel and de-twinning behavior during cyclic deformation are investigated. Results reveal their fatigue lives successively increase within LSP times ranging from 0 to 3. Instead, life degradation is noticed after 4th LSP due to damaged adsorption layer. Consequently, the negative thermal ablations release compressive residual stress and form σ phase, accelerating crack propagation. Thus, triple LSP impacts are determined as optimal condition for fatigue resistance of aluminized steel. According to twinning dislocation initiations and glide directions, the underlying de-twinning mechanisms during cyclic deformation are also discussed.

在此，研究了多次激光冲击强化 (LSP) 对镀铝钢疲劳性能和循环变形过程中去孪晶行为的影响。结果表明，它们的疲劳寿命在 LSP 次数从 0 到 3 的范围内连续增加。相反，由于吸附层损坏，在第 4 次 LSP 后注意到寿命下降。因此，负热烧蚀释放残余压应力并形成σ相，加速裂纹扩展。因此，三重 LSP 冲击被确定为镀铝钢抗疲劳性的最佳条件。根据孪生位错起始和滑动方向，还讨论了循环变形过程中潜在的去孪生机制。