Multiscale Investigation of Microcracks and Grain Boundary Wetting in Press-Hardened Galvanized 20MnB8 Steel

Author:

Arndt Martin1,Kürnsteiner Philipp23ORCID,Truglas Tia2,Duchoslav Jiri4ORCID,Hingerl Kurt4,Stifter David4,Commenda Christian1,Haslmayr Johannes1,Kolnberger Siegfried1,Faderl Josef1,Groiss Heiko2ORCID

Affiliation:

1. Voestalpine Stahl GmbH, Voestalpine-Straße 3, 4020 Linz, Austria

2. Christian Doppler Laboratory for Nanoscale Phase Transformations, Center for Surface and Nanoanalytics (ZONA), Johannes Kepler University Linz, Altenberger Straße 69, 4040 Linz, Austria

3. Department Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany

4. Center for Surface and Nanoanalytics (ZONA), Johannes Kepler University Linz, Altenberger Straße 69, 4040 Linz, Austria

Abstract

Grain boundary wetting as a preliminary stage for zinc-induced grain boundary weakening and embrittlement in a Zn-coated press-hardened 20MnB8 steel was analyzed using electron backscatter diffraction, Auger electron spectroscopy, energy dispersive X-ray analysis, atom probe tomography and transmission electron microscopy. Microcracks at prior austenite grain boundaries were observed. Structures that developed after microcrack formation were identified: for example, Zn/Fe intermetallic phases with grain sizes smaller than 100 nm were present at the crack surfaces and the wedge-shaped crack tips. An electrolytically coated reference sample that underwent the same heat treatment as the press-hardened material but without the application of tensile stress was investigated in order to find the initial cause of the microcracks. On this sample, Zn, in the order of one atomic layer, was found along prior austenite grain boundaries several micrometers away from the actual Zn/Fe phases in the coating. The resulting grain boundary weakening with the Zn wetting of prior austenitic grain boundaries during austenitization and/or hot forming is a necessary precondition for microcrack formation.

Funder

Christian Doppler Research Association

Austrian Federal Ministry of Labour and Economy

National Foundation for Research, Technology and Development, Austria

Publisher

MDPI AG

Subject

General Materials Science,Metals and Alloys

Reference39 articles.

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3. Influence of the starting microstructure of an advanced high strength steel on the characteristics of Zn-Assisted liquid metal embrittlement;Bhattacharya;Mater. Sci. Eng. A,2021

4. Liquid metal embrittlement susceptibility of zinc-coated martensitic sheet steels;Pant;Mater. Sci. Eng. A,2023

5. Liquid metal embrittlement susceptibility of two Zn-Coated advanced high strength steels of similar strengths;Bhattacharya;Mater. Sci. Eng. A,2021

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