Using water jet peening to strengthen local area of high-hardness carburized and quenched parts is a promising technology for surface modification. This paper focuses on the application of surface layer modification

and introduces the characteristics and applications of pure water jet

injection and suspension water jet in turn. On the basis of comprehensively comparing the characteristics of various jets

it is proposed that the suspension water jet is an ideal jet method in surface modification

and the problems existing in the modification of the suspension water jet peening are discussed. The jet formation

parameter measurement

nozzle shape and service life need to be further studied. Moreover

the surface integrity of modified layer

the fine process after water jet peening

the effective modification of high stress concentration area

the continuity of the formation of jet

and stability and other issues need to be concerned. On the basis of solving the above-mentioned mechanism problems

as well as improving the jet modification equipment

engineering application research on specific parts such as gears

blades

and spline shafts can be carried out.