Effect of Coiling Temperature on Bainite Transformation in Hot-Rolled Automotive Sheet Steel

Abstract

Advanced-High-Strength-Steel (AHSS) is used extensively in automotive applications for its excellent formability, high strength with weight-reduction capacity, and improved crashworthiness. An industrially processed as-cast AHSS slab sample (0.3C, 2.0Si, 2.5Mn) was hot-rolled after fully austenitized at 1200oC, followed by isothermal holding to simulate coiling temperature ranging from 500oC-600oC for 24 hours, later air cooled to room temperature. Bainite transformation was studied at sub-critical temperature during coiling of AHSS sheet. A mixture of ferrite, bainite, and retained austenite was evident in the hot-rolled microstructure. The effect of different coiling temperatures on morphology and mechanical properties (tensile, hardness, cold rollability) is discussed.

Department(s)

Materials Science and Engineering

Second Department

Mechanical and Aerospace Engineering

Keywords and Phrases

Automotive Steel; Bainite Transformation; Coiling Temperature; Cold Rollability; Hot Rolled Sheet

International Standard Book Number (ISBN)

978-093076737-2

International Standard Serial Number (ISSN)

1551-6997

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Association for Iron and Steel Technology, All rights reserved.

Publication Date

01 Jan 2025

Link to Full Text

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