Abstract
High-speed waterjet peening technology has attracted a lot of interest and is now being widely studied due to its great ability to strengthen metal surfaces. In order to further improve the mechanical properties of metals, self-excited oscillation pulsed waterjets (SOPWs) were used for surface peening with an experimental investigation focused on the surface topography and properties. By impinging the aluminum alloy (5052) specimens with SOPWs issuing from an organ-pipe oscillation nozzle, the hardness and roughness at various inlet pressures and stand-off distances were measured and analyzed, as well as the residual stress. Under the condition of optimum stand-off distances, the microscopic appearances of peened specimens obtained by SEM were displayed and analyzed. Results show that self-excited oscillation pulsed waterjet peening (SOPWP) is capable of improving the surface quality. More specifically, compared with an untreated surface, the hardness and residual stress of the peened surfaces were increased by 61.69% and 148%, respectively. There exists an optimal stand-off distance and operating pressure for creating the highest surface quality. SOPWP can produce almost the same enhancement effect as shot peening and lead to a lower surface roughness. Although such an approach is empirical and qualitative in nature, this procedure also generated information of value in guiding future theoretical and experimental work on the application of SOPWP in the industry practice.
Highlights
Nowadays, the properties and work reliability of many metallic materials are in need of improvement with the development of scientific technology and industrialization processes, such as the precision instrument and aircraft industries [1]
Investigation into thethe surface peening by self-excited oscillation pulsed waterjets (SOPWs)
In paper,we weperformed performedananexperimental experimental investigation into surface peening by SOPW
Summary
The properties and work reliability of many metallic materials are in need of improvement with the development of scientific technology and industrialization processes, such as the precision instrument and aircraft industries [1]. Ti6Al4V by waterjet peening without abrasive particles They determined the reason for metallic piece volume loss and verified the viability and the application of pure waterjet peening in the field of surface strength. Sadasivam et al [19] made an experiment to study the effects of elastic pre-stress and boundary in the process of abrasive waterjet peening. Experiments show that under the same circumstances, the organ-pipe nozzle can produce jets of instant pressure 1.5–2.5 times higher than ordinary nozzles [22] Due to these characteristics of SOPW, it is very suitable to be applied in the process of surface peening, with great advantages being generated. ItItserves to the waterjet peening technology to provide useful informationfor forbetter betterapplications applications of oscillation pulsed waterjet so as so to as provide useful information ofself-excited self-excited oscillation pulsed waterjet peening (SOPWP)
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