THERMOCHEMICAL TREATMENT ON AISI 8620 STEEL

• DOI: https://doi.org/10.22533/at.ed.3174262401119

• Palavras-chave: Acero, cementación, carbono

• Keywords: Steel, Carburizing, carbon.

• Abstract:

  A thermochemical treatment was performed on an AISI 8620 steel. The purpose of this treatment is to enrich the surface of the steel with carbon by means of the diffusion mechanism, so that the surface layer of the steel contains a higher concentration of carbon than that of its core. As a result, the case-hardened steel acquires a combination of properties: containing higher surface hardness and greater wear resistance, but without losing toughness in the core.

  The cementitious components added were: 90% charcoal and 10% barium carbonate (BaCO₃ ), the temperature in the furnace was 930°C, with a permanence of 8 hours, then the steel piece was cooled in oil for quenching and subsequently tempered at 230°C for a period of 30 minutes.

  The total depth is defined as the perpendicular distance from the limit of the surface to the end of the hardened zone. On the other hand, the microstructure obtained on the surface was of a martensite phase and the core was of a pearlite and ferrite phase, thus achieving a high toughness and wear resistant steel.