Investigation of the Effect of Heat Treatment Parameters on Mechanical Properties of AISI 4140 Alloy Steel by Quenching in Water

In this study, the changes in the mechanical properties of AISI 4140 alloy steel, which was hardened by quenching in water, and then tempered by different temperatures, as a result of tempering at different temperatures were investigated experimentally. In this study, tensile and impact test specimens were prepared. These specimens were collected in 2 groups. While the first group of these samples was subjected to hardening by quenching only, the samples in the other group were also subjected to tempering processes after quenching. As a result of the heat treatments, these samples were subjected to tensile tests according to TS 138 EN 10002-1/2004 and to impact tests according to TS EN 10045-1/1999. As a result of the experiments, the changes in the mechanical properties of the samples, which were hardened by quenching, were investigated at different tempering temperatures.