Comparative study of bonang gamelan musical instrument between hot forging and Post Cast Heat Treatment/PCHT on microstructure and mechanical properties

Abstract

Abstract Metals have long been used to produce various musical instruments to date. Bonang Gamelan is one of the traditional musical instruments of Karawitan. Tin bronze was the primary choice because this alloy is capable of form and has excellent acoustic properties. This study aims to compare the forging technique with post cast / PCHT heat treatment at a temperature of 550 °C with changes in microstructure and mechanical properties of Cu-20wt.% Sn and Cu-22wt.%Sn. Characterization of mechanical properties includes hardness/VHN, tensile strength σs), and bending (σb). The forging and post-cast heat treatment/PCHT can improve the mechanical properties of hardness, tensile strength, and bending of the bonang gamelan product. The heat treatment process at 550 °C followed by holding time for 4 hours, followed by quench was able to produce grain growth and homogenization of the eutectic phase. The modulus of elasticity of the bonang gamelan specimen to the tensile strength was inversely proportional to the bending strength.