Aspects of Thermomechanical Processing of 3^rd Generation Advanced High Strength Steels

Abstract:

The production of advanced high strength steels (AHSS) has been rapidly expanding in recent years as these steels allow for considerable reduction in weight and enhancement of car safety due to the unique combination of high strength, toughness and formability. Driven by growing demand for sheet AHSS products from carmakers, steel producers are currently developing AHSS of the so called 3^rd Generation to further facilitate weight reduction of critical safety parts while ensuring crash worthiness and high absorbed energy. Such steels not only possess tensile strength above 1000 MPa but also are being designed for exceedingly high formability: high elongation, bendability, hole expansion and strain hardening. These enhanced properties are to be achieved in final operations of continuous annealing and/or galvanizing. However, due to complicated alloy designs of 3G AHSS the role of each manufacturing stage becomes progressively significant due to its impact on the final microstructure. Therefore, hot strip rolling gains increasing importance as one of the most critical stages responsible for producing the microstructure optimal for achieving the final properties of the sheet products without impairing downstream operations. In other words, hot rolling of AHSS has to be viewed as thermomechanical processing.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 3-8
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.3
• Online since: May 2014
• Authors: Evgueni I. Poliak*, Debanshu Bhattacharya
• Keywords: Advanced High Strength Steel (AHSS), Hot Strip Rolling, Thermo-Mechanical Processing

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