Estudo de caso: elaboração da curva de revenimento de uma liga fundida de aço do tipo E

Abstract

With the growing demand for E-grade steel components in a foundry, a detailed case study was conducted on one of the critical manufacturing processes: post-quenching tempering heat treatment and its temperature variations. This study aimed to develop a tempering curve for E-grade steel within a temperature range of 550°C to 630°C, with a 10°C interval for each treatment, and a treatment duration of two hours. To construct the tempering curve, test specimens were first normalized at 920°C for 3 hours with a heating ramp rate of 150°C per hour. Following normalization, the specimens were quenched from 900°C with the same heating rate as used during normalization. Subsequently, the specimens were tempered at various temperatures to generate the hardness versus temperature curve. Hardness measurements were performed using the Brinell hardness test with a portable Kingtester durometer. The resulting tempering curve provides valuable insights into the relationship between tempering temperature and hardness for E-grade steel components.