New Ms-formula for exact microstructural prediction of modern 3rd generation AHSS chemistries

SCRIPTA MATERIALIA

卷:200

Article

Kaar, Simone^1,3  Steineder, Katharina²  Schneider, Reinhold¹  Krizan, Daniel²  Sommitsch, Christof³ 

[1] Univ Appl Sci Upper Austria, Res & Dev Dept, Stelzhamerstr 23, A-4600 Wels, Austria

[2] Voestalpine Stahl GmbH, Business Unit Coil, Res & Dev Dept, Voestalpine Str 3, A-4020 Linz, Austria

[3] Graz Univ Technol, Inst Mat Sci Joining & Forming, Kopernikusgasse 24-1, A-8010 Graz, Austria

关键词: Metastable phases;    Martensitic phase transformation;    M-s-temperature;    Modeling;    Steels;   

DOI  :  10.1016/j.scriptamat.2021.113923

来源: Elsevier

【 摘 要 】

The exact adjustment of the individual microstructural constituents, in particular the optimum volume fraction of metastable retained austenite (RA), is imperative in case of the 3(rd) generation advanced high strength steels (AHSS). Moreover, it is of vital importance to avoid the formation of fresh martensite (alpha') upon final cooling, otherwise the resulting mechanical properties of these novel steel grades will be pronouncedly deteriorated. Therefore, an accurate estimation of the martensite start (M-s) temperature is essential for modelling and development of this steel group. In this context, the present contribution proposes a new relation for the M-s temperature prediction with a remarkably wide composition range based on the 3(rd) generation AHSS chemistries. Moreover, the new M-s formula allows for an accurate determination of the M-s temperature for both, extremely low and very high C contents, which is not the case in any M-s formula known from literature. (C) 2021 The Author(s). Published by Elsevier Ltd on behalf of Acta Materialia Inc.

【 授权许可】

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