Effect of tempering temperature on microstructure and properties of 45 steel piano string

Abstract

The effect of tempering temperature on microstructure and properties of 45 steel was studied. The string of 45 steel was tempered in the temperature range of 820°C-880 °C by means of metallographic observation and microstructure performance test. The results show that with the increase of tempering temperature, the hardness and yield strength of the sample increase first and then decrease, the tensile strength increases, the impact toughness jumps, and the elongation and reduction of area show an upward trend. The experimental results provide theoretical guidance for 45 steel in the process of making piano strings.

Keywords

• 45 steel
• piano string
• tempering temperature
• microstructure
• mechanical properties