Análise microestrutural do aço A36 submetido a diferentes meios de têmpera

Abstract

The tempering process is one of the critical steps in the steel production process, having great importance in determining the quality of the material. The cooling means are directly linked to the quality of the product, as its structure and properties vary according to the cooling medium. In this work, 3 A36 steel proofe bodies were heated at a temperature of 900 °C for 30 minutes, thus reaching their austenitization temperature, and then up to room temperature, but in different media. The first was cooled in a solution of emulsion polymer (ethylene glycol), the second was cooled in mineral oil and the third in water at room temperature. When all the pieces had cooled down and reached room temperature, a cut was made in the middle of the pieces, where they were sanded and etched with 3% nital. After such processes, the pieces were analyzed under a digital microscope and submitted to a Rockwell hardness test.