Abstract

Shot peening is a treatment used to increase surface hardness and wear resistance. In this study, the effect of shot peening on the microstructure, hardness and wear resistance of AZ31 magnesium alloy was investigated. For this purpose, specimens were exposed to shot peening operation using steel pellets for periods of 20, 40, 60, and 80 min. Microstructures were investigated using a scanning electron microscope (SEM) and X-Ray diffraction (XRD). In addition, the Vickers method and the pin on disk method were used to measure the hardness and wear for testing, respectively. The results showed that the shot peening operation resulted in grain refining on the surface, in addition, the wear resistance increased with increasing shot peening time. This is because of grain refining on the surface and the micro strains created by shot peening. Assessment of surface wearing indicated the application of an adhesive wear mechanism on the untreated specimen and the abrasive wear mechanism in the shot peened specimens. Moreover, by increasing the duration of shot peening, the abrasive wear decreased due to increased hardness.

中文翻译：

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喷丸处理对AZ31镁合金组织和磨损行为的影响

摘要

喷丸处理是一种用于增加表面硬度和耐磨性的处理。本研究研究了喷丸处理对AZ31镁合金的组织，硬度和耐磨性的影响。为此，将样品使用钢丸进行喷丸处理，时间为20、40、60和80分钟。使用扫描电子显微镜（SEM）和X射线衍射（XRD）研究了微结构。另外，使用维氏法和销钉盘法分别测量硬度和磨损以进行测试。结果表明，喷丸处理可以使表面细化，此外，耐磨性随喷丸处理时间的增加而增加。这是由于表面上的晶粒细化和喷丸产生的微应变。对表面磨损的评估表明，在未处理的试样上应用了粘合剂磨损机理，而在喷丸处理的试样中则采用了磨料磨损机理。此外，通过增加喷丸处理的持续时间，由于增加了硬度，减少了磨料磨损。