Two-step continuous cooling heat treatment applied in a low carbon bainitic steel

被引：0
作者：
de Castro P.J. [1 ]
de Figueiredo Silveira A.C. [1 ]
Ivaniski T.M. [1 ]
Turra C.J. [1 ]
Epp J. [2 ,3 ]
Rocha A.D.S. [1 ]
机构：
[1] Universidade Federal do Rio Grande do Sul, Departamento de Metalurgia, Av. Bento Gonçalves RS, Porto Alegre
[2] Leibniz-Institut für Werkstofforientierte Technologien - IWT, Badgasteiner Str., Bremen
[3] University of Bremen, MAPEX Centre for Materials and Processes, Bremen
来源：
Materials Research | 2021年 / 24卷 / 02期
关键词：
Granular bainite; Heat treatment; Lath-like bainite; Low carbon bainitic steel;
D O I：
10.1590/1980-5373-mr-2020-0334
中图分类号：
学科分类号：
摘要：
Thermo-mechanical treatments using continuous cooling after forging are an established method for producing bainitic steels, mainly because of the elimination of energy intensive additional heat treatment processes. The cooling is usually employed in an uncontrolled manner in the industrial sector, which can be detrimental to the resulting microstructural morphology and, consequently, to the final product properties. In this study, a new controlled two-step cooling route based on the principles of bainitic displacive growth was designed and applied in a 0.18C (wt-%) steel. Inverse finite element method was used on the cooling data to obtain the evolution of temperatures for the samples during cooling, allowing to assess point to point cooling rates. Investigations via X-ray diffraction, optical microscopy analysis and hardness testing revealed a variation of bainitic morphology, namely, the transition from granular bainite to lath-like bainite with relatively high hardness and constituents/ phase boundaries than the pre-treated microstructure. © 2021 Universidade Federal de Sao Carlos. All rights reserved.
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