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This research studied the effect of stress relief heat treatment on mechanical properties and microstructure in carbon steel AISI 1045 grade. The specimen was carbon steel AISI 1045 which thickness of 6 mm. The AISI 1045 specimens were welded utilizing a gas metal arc welding (GMAW) process. After welding, the stress relief heat treatment parameters examined in this study included stress relief temperature of 450, 500, 550, 600 and stress relief treatment time of 1 and 5 hour. The resulting materials were examined using the full factorial design of experiments to determine the resulting material hardness, tensile strength testing and microstructure observed with optical microscopy (OM) following ASTM standard. A factorial analysis, which was conducted on the interaction between the stress relief heat treatment temperature and time to the hardness of the heat affected zone and tensile strength, had a 95% confidence level. The results show that the highest hardness and tensile strength achieved during the SRHT was 222 HV and 622 MPa for a SRHT time of 5 hr. and a SRHT temperature of 550 °C. The stress relief heat treatment analysis indicates that a sustainable in the amount of pearlite results in better hardness and tensile strength.

Investigation of Stress Relief Heat treatment on Carbon Steel AISI 1045 Weld