This work is devoted to the experimental investigation of the effect of laser shock peening (LSP) on the thermo-mechanical properties of metals. ARMCO iron was chosen as the model material for the study. Samples were subjected to LSP, and were tested following the procedure of the self-heating (Risitano) technique. To investigate the damage that was induced by heating, the fatigue tests were coupled with infrared thermography measurements. The results of the study showed that the LSP procedure qualitatively changes the temperature evolution in ARMCO iron during cyclic loading. The heating (energy dissipation) of the LSP treated specimen was several times higher than that of the specimen in the initial state. To explain the structural mechanisms of energy dissipation, the microstructure of the specimens was examined using transmission (TEM) and scanning (SEM) electron microscopy, as well as electron backscattering diffraction (EBSD). The results of the structural investigation confirm the qualitative change of defect evolution caused by LSP treatment.

中文翻译：

---

LSP对ARMCO铁在循环载荷下的结构演变和自热的影响

这项工作致力于激光冲击强化 (LSP) 对金属热机械性能影响的实验研究。ARMCO 铁被选为研究的模型材料。样品经过 LSP，并按照自加热 (Risitano) 技术的程序进行测试。为了研究加热引起的损坏，疲劳测试与红外热成像测量相结合。研究结果表明，LSP 程序定性地改变了循环加载过程中 ARMCO 铁的温度变化。LSP 处理的试样的加热（能量耗散）比初始状态的试样高几倍。为了解释能量耗散的结构机制，使用透射 (TEM) 和扫描 (SEM) 电子显微镜以及电子背散射衍射 (EBSD) 检查样品的微观结构。结构研究的结果证实了由 LSP 处理引起的缺陷演变的质变。