A comparative study on the carbon diffusion characteristics in c 0.20-cr 1.14 carburized alloy steel

Abstract

Gas carburization, which is heat treated with CO2 gas, is a common heat treatment method used for mass production. This method is used to improve the mechanical properties of most metal products, such as mechanical parts, automotive parts, and aircraft. The experiment was carried out in an RX gas atmosphere containing propane gas in an alloy steel containing C 0.2 wt% And Cr 1.14 wt%. As a result, the Vickers hardness was measured at 725 HV at a carburizing depth of 0.1 mm and 570 HV at 1.5 mm. Observation of the carburized specimens by optical microscope revealed that ferrite and pearlite structures were observed in the pre-carburized structure, but most layered martensite structure appeared after carburization. Simulation results show that the carburizing capacity of the surface layer was up to 0.7% C when the carbon potential was 1.0-1.1 wt% and the diffusion carbon potential was 0.75 wt%. However, when the carbon potential was 1.0 wt% and the diffusion carbon potential was 0.85 wt%, the surface layer was carburized to 0.8 % C. In the future, we will study corrosion resistance and abrasion resistance among the mechanical properties that are necessary to be used as automotive parts in order to contribute to the prolongation of the life span of automobile parts.