This study investigates the influence of a deep cryogenic treatment-abrasive water jet (DCT-AWJ) composite surface modification process on the surface integrity of 7075 aluminum alloy, with single abrasive water jet (AWJ) treatment as the control. Surface morphology, phase composition, residual stress, and microhardness were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and microhardness testing. Under AWJ treatment, the surface roughness increases with jet pressure (0.864, 1.082, and 1.325~$\mu$m at 5, 10, and 15~MPa). Under DCT-AWJ treatment, the roughness decreases with increasing cryogenic treatment time but increases with jet pressure, and it is lower tha... More >

The water jet surface modification technology does not introduce thermal stress and thermal deformation during operation, reducing changes in the material's phase transformation temperature or grain growth, and avoiding problems related to thermal stress and deformation. It contains no chemical substances, posing no environmental pollution, and features low cost. It enables treatment of surfaces in narrow spaces, deep grooves, and on small components, and can operate under complex environmental conditions. Moreover, it is easy to mechanize and automate, showing great application prospects across many industries. This paper first reviews the development history and working principles of high-... More >