Aktuelle Forschungsergebnisse zur Rissbildung in feuerverzinkten Stahlkonstruktionen

Feldmann, Markus; Ulbrich, Detlef; Breitschaft, Gerhard

doi:10.1002/dibt.200930018

DIBT Mitteilungen

2009

DOI: 10.1002/dibt.200930018

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Aktuelle Forschungsergebnisse zur Rissbildung in feuerverzinkten Stahlkonstruktionen

Markus Feldmann

Detlef Ulbrich

Gerhard Breitschaft

Abstract: Abstract1. Vorbemerkung2. Kurzfassung des Forschungsberichtes 16.132 “Stichprobe zur Erfassung der Verzinkungsschäden an in den Jahren 2000 bis 2005/2006 hergestellten Stahlbauten im Gebiet der Bundesrepublik Deutschland”2.1. Anlass und Zielsetzung2.2. Erste Maßnahmen2.3. Maßnahmen für den gebauten Bestand2.4. Zusammenstellung der geprüften Konstruktionen2.5. Durchführung der Prüfungen vor Ort2.6. Ergebnis der Prüfungen2.7. Zusammenfassung, Schlussfolgerungen und Empfehlungen

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Influence of strength and cold forming on liquid metal embrittlement due to hot-dipping of high strength structural steels

Luithle¹

2018

Materials Testing

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Two structural steels were cold deformed and tested via tensile tests to investigate the dependence of cold deformation on liquid metal embrittlement during hot-dipping. It was found that the reduction in area of tensile specimens with a low degree of deformation showed, when tested in liquid zinc, the highest degradation compared with a tensile test in air that had been heated to 450 °C. An increasing degree of deformation leads to a decreasing tendency to form brittle cracks. The material conditions of steel S355J2 with the highest degree of deformation manifested nearly no influence on liquid metal embrittlement. For steel S460N, the amenability to a reduction in area of the highly deformed material was degraded when compared to tests in hot air. The reason for these differences in the extent of liquid metal embrittlement during hot-dipping might have to do with a difference in microstructure, in particular with respect to the grain size and the deformation of the microstructure.

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Influence of strength and cold forming on liquid metal embrittlement due to hot-dipping of high strength structural steels

Luithle¹

2018

Materials Testing

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Liquid Metal Assisted Crack Formation in Zinc Melts, Representation of the Damage Pattern Using 3D Computed Tomography

Körber

Hoche

Oechsner

2017

Practical Metallography

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In the past, liquid metal induced galvanizing cracks were either analyzed on the metallographic section in the respective partially ground plane of view, or the exposed main fracture surface was examined in the scanning electron microscope (SEM). Thus, possibly existing secondary cracks remained undetected. Three-dimensional computed tomography (CT) allows for a representation of all cracks including their branchings and ramifications and makes possible an analysis of an overall picture of the network of cracks. Differences in the effect of different zinc melts can be further identified by means of 3D analysis and the load situations that promote the crack initiation during hot-dip galvanizing can be differentiated more clearly using laboratory samples. Key results are the representation of cracks parallel to the direction of the main load (B-cracks) which are oriented with the pearlite bands and apparently penetrate significantly deeper into the base material than the macroscopically visible crack which is orientated perpendicular to the direction of the main load (A-crack). A relationship between the occurrence of B-cracks and the used zinc alloys could only conditionally be shown. Examinations on flat samples, which had been dipped into various metal melts under load-free condition, yielded more or less comparable results, in particular for molten pure tin and molten pure lead. In this case, the pearlite phase is preferentially damaged even without introducing an external load into the samples.

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Aktuelle Forschungsergebnisse zur Rissbildung in feuerverzinkten Stahlkonstruktionen

Cited by 2 publications

References 3 publications

Influence of strength and cold forming on liquid metal embrittlement due to hot-dipping of high strength structural steels

Influence of strength and cold forming on liquid metal embrittlement due to hot-dipping of high strength structural steels

Liquid Metal Assisted Crack Formation in Zinc Melts, Representation of the Damage Pattern Using 3D Computed Tomography

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