<abstract xmlns="http://www.w3.org/1999/xhtml">In production it is necessary to achieve conditions that lead to the minimum decarburization of a steel product’s surfaces. In this study, the hypo-eutectoid carbon steel C45 was annealed in air in the temperature range <italic>T</italic>a = 600–1100 °C. The annealing times were between <italic>t</italic>a = ½ h and <italic>t</italic>a = 2 h. Different decarburizations occurred in different microstructures: ferrite–pearlite (<italic>T</italic>a = 600 °C and 700 °C, <italic>T</italic>a &lt; AC1, no visible decarburization); ferrite–austenite (<italic>T</italic>a = 760 °C, AC1 &lt; <italic>T</italic>a &lt; AC3, visible decarburization); austenite at the beginning, ferrite– austenite after the incubation period (<italic>T</italic>a = 850 °C, AC3 &lt; <italic>T</italic>a &lt; 912 °C, visible decarburization); and austenite (<italic>T</italic>a= 950 °C and 1100 °C, <italic>T</italic>a> 912 °C, visible decarburization and overheating of steel). The edges were more prone to decarburization and to overheating. Stress relieving, normalizing and annealing before quenching of the steel C45 can be carried out in air.</abstract>

In production it is necessary to achieve conditions that lead to the minimum decarburization of a steel product’s surfaces. In this study, the hypo-eutectoid carbon steel C45 was annealed in air in the temperature range Ta = 600–1100 °C. The annealing times were between ta = ½ h and ta = 2 h. Different decarburizations occurred in different microstructures: ferrite–pearlite (Ta = 600 °C and 700 °C, Ta < AC1, no visible decarburization); ferrite–austenite (Ta = 760 °C, AC1 < Ta < AC3, visible decarburization); austenite at the beginning, ferrite– austenite after the incubation period (Ta = 850 °C, AC3 < Ta < 912 °C, visible decarburization); and austenite (Ta= 950 °C and 1100 °C, Ta> 912 °C, visible decarburization and overheating of steel). The edges were more prone to decarburization and to overheating. Stress relieving, normalizing and annealing before quenching of the steel C45 can be carried out in air.

Decarburization of the Carbon Steel C45 During Annealing in Air

Materials and Geoenvironment

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Decarburization of the Carbon Steel C45 During Annealing in Air"}

In production it is necessary to achieve conditions that lead to the minimum decarburization of a steel product’s surfaces. In this study, the hypo-eutectoid carbon steel C45 was annealed in air in the temperature range Ta = 600–1100 °C. The annealing times were between ta = ½ h and ta = 2 h. Different decarburizations occurred in different microstructures: ferrite–pearlite (Ta = 600 °C and 700 °C, Ta  912 °C, visible decarburization and overheating of steel). The edges were more prone to decarburization and to overheating. Stress relieving, normalizing and annealing before quenching of the steel C45 can be carried out in air.

In production it is necessary to achieve conditions that lead to the minimum decarburization of a steel product’s surfaces. In this study, the hypo-eutectoid...

Decarburization of the Carbon Steel C45 During Annealing in Air

Published Online: May 31, 2019

Page range: 167 - 178

Received: May 17, 2018

Accepted: Nov 30, 2018

DOI: https://doi.org/10.2478/rmzmag-2019-0005

Keywords
annealing, hypo-eutectoid steel, air, oxidation, decarburization

© 2018 Matija Zorc et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Decarburization of the Carbon Steel C45 During Annealing in Air

Published Online: May 31, 2019

Page range: 167 - 178

Received: May 17, 2018

Accepted: Nov 30, 2018

DOI: https://doi.org/10.2478/rmzmag-2019-0005

Keywordsannealing, hypo-eutectoid steel, air, oxidation, decarburization

© 2018 Matija Zorc et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
annealing, hypo-eutectoid steel, air, oxidation, decarburization