Margono Margono, Bambang Hari Priyambodo and Rizqi Ilmal Yaqin
Keywords: AISI 304, Shot Peening, Hardness, Corrosion
Abstract:
<p class="MsoNormal" style="margin-left:0cm;text-indent:0cm;mso-list:l0 level1 lfo1;
tab-stops:list 0cm">AISI 304 is one of the materials used for
biomaterials. However, its mechanical properties and corrosion resistance need
to be improved. Therefore we need a surface treatment that can improve its
mechanical properties and corrosion resistance. Shot peening is a method of
improving mechanical properties and corrosion resistance by firing a high-speed
steel ball at a metal surface. This study examines the effect of the shot
peening process on the hardness and corrosion rate of AISI 304. Shot peening
was carried out by varying the sizes of steel balls (0.2, 0.5, and 0.8) mm diameter
and a pressure of 9 Bar in 20 minutes. The hardness of the steel balls is 40 -
50 HRC. The Vickers hardness test was carried out with a load of 5 gf for 10
seconds. Corrosion rate testing was carried out in bovine serum media. The
hardness results show that the farther the depth distance from the surface of
the shot peening result, the lower the hardness. Meanwhile, the closer the
depth to the surface of the shot peening result, the higher the hardness. The
corrosion rate of shot peening with a steel ball diameter of 0.5 is lower than
that of shot peening with a steel ball diameter of 0.2 mm and 0.8 mm. The
corrosion rate value of shot peening specimens with a steel ball diameter of
0.5 mm was 0.117 mpy, 3 times lower than that of non-treated specimens, which
was 0.378 mpy.</p>
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