Pengaruh Variasi Ukuran Bola Baja pada Proses Dry Shot Peening terhadap Mikrostruktur dan Kekerasan Material Implan AISI 316L
Keywords:Steel Ball, Dry Shot Peening, Solution Annealing, Microstructure, Hardness, AISI 316L
AbstractAISI 316L isÂ a type ofÂ 316 austenitic stainless steelÂ with characteristicÂ very lowÂ carbon content. ThisÂ materialÂ containsÂ several elementsÂ such as molybdenum-chromium-nickel whichÂ are aimed to improve the corrosionÂ and oxidation resistances at high temperature applications.Â The low carbon content and the high level of corrosion resistance of AISI 316L allow this material to be applied to the surgicalÂ implantÂ applications in the human body as well as on the welding applications. Several methods of surface treatment appliedÂ inÂ AISIÂ 316LÂ are aimed to improveÂ the mechanical propertiesÂ andÂ corrosion resistance. DryÂ shotÂ peeningÂ is one of coldÂ deformationÂ processesÂ which is conducted on the material surface to improveÂ the mechanicalÂ strength. The process was performed byÂ firingÂ ballsÂ of steelÂ with particular sizes of 0.5 mm, 1Â mm,Â 2 mm,Â and 3Â mmÂ onÂ specimensÂ with aÂ certain speedÂ that comes fromÂ the pressure ofÂ theÂ air compressor. The results show that parameter of shot angle at the dry shoot peening process has an influence on microstructure and hardness of the AISI 316L austenitic stainless steel. The highestÂ value of hardnessÂ was achievedÂ usingÂ 3 mmÂ diameterÂ of steelÂ ballÂ with the value ofÂ hardness reachedÂ 560Â VHNÂ on metal surfaceÂ then gradually decreased as the depth increased.
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