PENGARUH VARIASI WAKTU SHOT PEENING TERHADAP STRUKTUR MIKRO DAN KEKERASAN PERMUKAAN PADA MATERIAL IMPLAN AISI 304
ABSTRACT: AISI 304 stainless
steel is a type of implant material with a relatively low cost. However, its mechanical
properties need to be improved so it can compensate the AISI 316L and titanium
alloy materials. Fatigue characteristic is also one of the important criteria
that must be evaluated in order to achieve overall service performance when the
material is under dynamic loads. The hardness surface and the nano-structures
formation can delay the propagation of fatigue crack initiation and can reduce
the corrosion rate. This study is conducted to determine the changes in
microstructure and hardness of AISI 304 for shot peening process. The surface
treatment by shot peening process is performed by setting the variation of the
shooting time of 0, 5, 10, 20, 30 and 40 minutes at a shooting pressure of 7
bar using the Steel Shot diameter of 0.6 mm with a hardness of 40-50 HRC. The
distance between the nozzle and the specimen surface is set at 100 mm. The
microstructure is analyzed by optical microscope with a magnification of 100
times and photographed using optilab, which is connected to a computer. Surface
hardness is tested using a Micro Vickers with indentation load of 10 grams for
10 seconds. The results show that refined microstructure layer is formed in the
shot peening surface and the hardness is also increased gradually as well as
shot peening time of 0, 5, 10, 20, 30 and 40 minutes. This also increase the
hardness number of 241, 404, 418, 437, 481 and 496 VHN. To sum up, the shot
peening can be used to refine the grain and to increase the hardness.
Penulis: Trio Nur Wibowo,
Priyo Tri Iswanto, Bambang Hari Priyambodo, Nur Amin
Kode Jurnal: jptmesindd160324