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喷丸强化是提高机械零件疲劳寿命的一种常用的表面处理工艺，广泛地用于飞机、汽车及其他制造行业。球形铁丸时零件表面的冲击作用，会使其表层产生残余压应力，能减小零件承载时所产生的拉应力，从而提高其疲劳寿命。为量化分析喷丸强化的效果，用含2％Cu的锻造钢粉末制成连杆和试验试律，对其在喷丸和未喷丸状态下的疲劳特性进行了比较。由于零件的疲劳特性与其表面残余应力有关，所以采用X-射线衍射分析法来测定零件表面应力大小和应力深度，并确定喷丸强化的最优工艺参数。试验结果表明，经喷丸处理的连杆与试棒的疲劳强度明显高于未喷丸连杆与试棒的疲劳强度。
Shot peening is a common surfacing process used to increase the fatigue life of mechanical parts and is widely used in the aircraft, automotive and other manufacturing industries. Spherical iron ball when the impact of the surface of the parts, will make the surface residual compressive stress, can reduce the tensile stress generated when the part bearing, thereby increasing its fatigue life. In order to quantitatively analyze the effect of shot peening, the connecting rod and test test were made by using forged steel powder containing 2% Cu, and the fatigue characteristics of shot peening and non-shot peening were compared. Due to the fatigue characteristics of the parts related to the residual stress on the surface, X-ray diffraction analysis is used to determine the surface stress and stress depth of the part and to determine the optimum process parameters for shot peening. The test results show that the fatigue strength of shot peening rod and test rod is obviously higher than the fatigue strength of non-shot peening rod and test rod.