Title

MODELING STEEL TRANSFORMATION BEHAVIOR FROM COOLING BEHAVIOR BY THE KUYUCAK METHOD

MODELING STEEL TRANSFORMATION BEHAVIOR FROM COOLING BEHAVIOR BY THE KUYUCAK METHOD

Authorship

Sarmiento, Gustavo Sánchez; Riofano, Rosamel Melita Muñoz; Canale, Lauralice Campos Franceschini; Totten, George Edward; Gastón, Analía

Sarmiento, Gustavo Sánchez

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Riofano, Rosamel Melita Muñoz

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Canale, Lauralice Campos Franceschini

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Totten, George Edward

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Gastón, Analía

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DOI

10.5151/2594-5327-16966

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Abstract

Heat treatment is performed to achieve the desired as-quenched and tempered mechanical properties of steel. Heat treatment of steel involves heating the steel to an elevated temperature, typically the austenitizing temperature, often with subsequent quenching into a vaporizable liquid medium such as water, oil or aqueous polymer quenchant. In the laboratory, steel quenching is studied by inserting thermocouples into a probe or an actual part to determine the time- temperature profile (cooling curve) during the quenching process. However, this is not always possible. Recently, Kuyucak has described a process involving the measurement of the temperature increase of the quenchant in the vicinity of the cooling metal surface as a function of time. From this time-temperature data, cooling curves of the metal being quenched may be calculated which are then used to predict microstructure and hardness. This paper describes the successful utilization of this process to predict the as-quenched properties of AISI 4140 steel under laboratory quenching conditions when using water as the quenchant.

Heat treatment is performed to achieve the desired as-quenched and tempered mechanical properties of steel. Heat treatment of steel involves heating the steel to an elevated temperature, typically the austenitizing temperature, often with subsequent quenching into a vaporizable liquid medium such as water, oil or aqueous polymer quenchant. In the laboratory, steel quenching is studied by inserting thermocouples into a probe or an actual part to determine the time- temperature profile (cooling curve) during the quenching process. However, this is not always possible. Recently, Kuyucak has described a process involving the measurement of the temperature increase of the quenchant in the vicinity of the cooling metal surface as a function of time. From this time-temperature data, cooling curves of the metal being quenched may be calculated which are then used to predict microstructure and hardness. This paper describes the successful utilization of this process to predict the as-quenched properties of AISI 4140 steel under laboratory quenching conditions when using water as the quenchant.

Keywords

Kuyucak; Cooling curve; Quenching; Hardness.

Kuyucak; Cooling curve; Quenching; Hardness.