Kaji eksperimen pengaruh hardening dan tempering terhadap kekuatan tarik dan kekerasan pada baja karbon sedang

Abstract

This study aims to determine the effect of hardening and tempering on tensile strength (ASTM E 8) and hardness (Rockwell) applied to medium carbon steel. The heat treatment process hardening is heated by a furnace at a temperature of 900 °C and 920 °C then held for 30 minutes and cooled quickly and then further processed by Tempering with each being tempered at 500 °C and cooled slowly. The results obtained are in the hardening process with a temperature variation of 900 °C, the hardness value increases from the raw material value of 5.7 HRC to 7.52 HRC and has increased again at a temperature of 920 °C of 8.08 HRC. Tempering process temperature variation of 900/ 500 °C the value is above raw material by 5.7 HRC to 7.24 HRC, down at a temperature of 920/500 °C by 6.4 HRC. For tensile testing of the hardening process against utimate stress, the value for raw material is 516,095 MPa, temperature is 900 °C/451,065 MPa and temperature is 920 °C/389,625 MPa. for yield strength raw material value is 477.4165 MPa, temperature is 900°C/270.8395 MPa, temperature is 920°C/256.4555 MPa, for modulus raw material value is 347.53 GPa, temperature is 900°C/3452605 MPa , the temperature is 920 °C/338.206 MPa, for the elongation value the raw material value is 7.871%, the temperature is 900 °C/11.392%, the temperature is 920 °C/16.448 %. for tempering to utimate stress the raw material value is 516,095 MPa, temperature 900/500 °C is 417,5635 MPa and temperature 920/500 °C is 372.416 MPa. For yield strength raw material value is 477.4165 MPa, temperature 900/500°C 304.1745 MPa, temperature 920/500 °C is 269.818 MPa, for modulus raw material value is 347.53 GPa, temperature 900 /500°C is 353.1525 MPa, temperature 920/500 °C is 366.5695 MPa, for the elongation value the raw material value is 7.871%, temperature 900/500 °C is 11.392%, temperature 920/500 ° C is 13.7665%.