Abstract
The peening solution treatment was performed on AC4CH aluminum alloy by ultra-high-temperature and high-pressure cavitation (UTPC) processing, and the peening natural aging was examined. Furthermore, peening artificial aging treatment by low-temperature and low-pressure cavitation (LTPC) was performed, and the time course of peening natural aging and peening artificial aging were compared and investigated. It was found that when the AC4CH alloy is processed for an appropriate time by UTPC processing, compressive residual stress is applied and natural aging occurs. In addition, the UTPC processing conditions for peening natural aging treatment with high compressive residual stress and surface hardness were clarified. After peening artificial aging by LTPC processing, the compressive residual stress decreases slightly over time, but the compression residual stress becomes constant by peening natural aging through UTPC treatment. In contrast, it was found that neither natural nor artificial peening natural aging occurs after processing for a short time.
Highlights
ultra-hightemperature and high-pressure cavitation (UTPC) processing aimed at natural aging and low-temperature and low-pressure cavitation (LTPC) processing for comparison were performed on the rolled tempered material
When formed atatthe theinjection injectioncenter, center,and andaaapeening peeningregion regionisis isformed formedaround aroundthe thetransition transitionregion regionofof ofthe the at the injection center, and peening region formed around the transition region the erosion region
Peening solution treatment was performed on AC4CH by UTPC processing to investiPeening solution treatment was performed on AC4CH by UTPC processing to invesgate peening natural aging
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The mechanism of high-pressure water jet action on materials has been well understood for decades [1]. Shot peening [2,3] and fine particle peening [4] are techniques for mechanically striking surfaces with particles to impart compressive residual stress. Another processing technology modifies surfaces with an abrasive water jet formed by adding an abrasive to water pressurized to about 300 MPa [5,6]
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