The Effect of Quenching Temperature Differences Using Oil as a Medium on the Hardness of 20Sn Bronze Alloy

Abstract

Bronze is a metal mixture of copper (Cu) and white tin (Sn) that is widely used in the manufacture of traditional musical
instruments such as gamelan, as it has good acoustic properties and high wearability. However, bronze's weakness lies in the
potential for material deterioration due to long-term repeated use, which can affect sound quality. One option that can be used
to increase the hardness of material properties, especially the hardness of bronze, is heat treatment using the quenching
method. In this study, the general results of the Vickers hardness test showed that the highest increase in hardness occurred in
specimens with heat treatment at 300°C using oil cooling media, with a value of 97.1 kgf/mm². On the other hand, the lowest
hardness value was found in the raw material specimen, which amounted to 79.24 kgf/mm². The higher the quenching treatment
temperature, the hardness tends to decrease. This can be seen at 400°C and 500°C.