GH4151合金超声喷丸强化数值与试验表征分析OA

To investigate the surface state of GH4151 alloy after ultrasonic shot peening strengthening and analyze its strengthening mechanism,characterization tests and numerical simulation analysis were conducted.The effects of shot diameter on surface morphology,microstructure,and microhardness distribution of GH4151 alloy under peening intensities of 0.15 A and 0.25 A were explored.The difference between the simulated roughness value and the final test evaluation data is less than 10%,confirming the reliability of the simulation prediction.At a peening intensity of 0.15 A,compared with 1.5 mm shots,the use of 2.5 mm shots results in a reduction of approximately 10.9%in roughness Ra and about 10.4%in roughness Rz.The results show that a higher shot peening intensity enhances the weakening effect on the peaks and valleys.Increasing the shot diameter improves the uniformity of the surface macro-morphology.After ultrasonic shot peening treatment,the plastic deformation layer is obvious,and the dispersion of hardness values along the depth direction is reduced.Both surface microhardness and the depth of the affected layer increase significantly,and the uniformity of the hardened layer is improved.