Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
EFFECTS OF CARBURIZING AND CARBONITRIDING THROUGH CHEMICAL, MICROGRAPHIC AND HARDNESS ANALYSIS ON JIS SCM 420 STEEL
Submission Author:
Bruno Mello de Freitas , AM
Co-Authors:
Bruno Mello de Freitas, Genilson Colares Da Silva, Joaquim Souza de Oliveira, José Costa Macêde de, Adalberto Gomes de Miranda
Presenter: Bruno Mello de Freitas
doi://10.26678/ABCM.COBEM2021.COB2021-1960
Abstract
The thermochemical treatments of Carburizing and Carbonitriding through the diffusion of carbon and nitrogen on the surface of steels increase the hardness and the wear resistance of the material. However, they are required to assess the efficiency of such treatments. This work analyzed the effects of LPG gas carburizing and LPG ammonia nitride treatments on SCM 420 steel, which is a steel, used to manufacture equipment and motorcycle gear, followed by water quenching and air tempering. The comparison was made by Optical Emission Spectrometry, HMV hardness measurement and optical microscopy. The results showed that the percentage of carbon increased significantly in the carburized and carnonitrided samples, with 378.4% and 330.7%, respectively. The hardness was added in both treatments, but more on the surface of the carburized steel and the micrographs revealed the solubility of Carbon in Austenite, in addition to the formation of the tempered martensite microstructure. Therefore, the processes were efficient in changing the surface of the material, but leaving the core of the piece tenacious.
Keywords
SCM 420 steel, Thermochemical treatments, Microscopy, Toughness, Chemical analysis
