Ermittlung der Rissanfälligkeit von Baustählen beim Stückverzinken

Feldmann, Markus; Bleck, Wolfgang; Langenberg, Peter; Pinger, Thomas; Tschickardt, Dirk; Völling, Alexander

doi:10.3139/120.100811

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…In addition, a drilled hole with a radius of 3 mm at the end of a central cut is provided as a defined notch instead of a preinduced crack. From these two adaptions the name long notch-tip tension specimen, LNT for short, is derived and used to characterize this test method [31]. At the upper ends of the specimen, each leg was provided with a drilled hole for clamping in a test fixture to apply mechanical loading, Figure 1.…”

Section: Specimen Geometrymentioning

confidence: 99%

“…In these two studies, the influences of the zinc alloy and the residual stress and microstructure states of the samples were mixed owing to the test setup, so that a clear quantification of the individual influencing parameters was impossible. Against this background, a test method was developed by which decoupling, and quantification of the influences could be realized [25, 26, 31, 32]. Using the test method with long notch‐tip tension specimen, the ductility of steels can be tested with the simultaneous effect of hot liquid zinc, and the specific susceptibility to cracking can be determined as a material or system characteristic.…”

Section: State Of the Artmentioning

confidence: 99%

“…The zinc bath was located directly underneath the load application device in an electrically fired ceramic crucible with a capacity of 350 kg of liquid zinc. The testing device was fixed to a forklift so that the long notch‐tip tension sample could be lowered into the molten zinc and pulled out after the test was finished [31, 33].…”

Section: Test Descriptionmentioning

confidence: 99%

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Susceptibility of structural steel to liquid metal embrittlement during hot‐dip galvanizing in zinc 5 %‐aluminum alloy

Pinger¹,

Schäfer²,

Geßler

2022

Materialwissenschaft Werkst

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The phenomenon of liquid metal embrittlement has been known in the field of batch hot-dip galvanizing for decades. With the increasing use of zinc alloys with higher content of aluminum, the question arises regarding the specific liquid metal embrittlement effects of such alloys on structural steels. The influence of a zinc 5 %-aluminum alloy during galvanizing on structural steel grades S355 and S700 was investigated and compared with the results obtained in a conventional pure zinc melt. Furthermore, the effect of the low-melting alloying element tin in both the zinc 5 %-aluminum and zinc alloys was investigated. Specimens were prepared and mechanically loaded during immersion in a liquid zinc alloy. The tests revealed the consistently ductile behavior of S355 steel without any cracking or reduction of the strain capacity under the influence of liquid zinc 5 %-aluminum alloy and pure zinc. Steel grade S700 shows reduced deformability in zinc 5 %aluminum alloy but better behavior in comparison to that in pure zinc. Upon the addition of tin, the zinc 5 %-aluminum alloy behaves very positively with no reduction in the ductility of the steel, whereas the same addition in pure zinc leads to a drastic drop in ductility.Keywords: Liquid metal embrittlement / hot-dip galvanizing / zinc 5 %-aluminum-alloy / structural steel / high-strength steel Das Phänomen der Flüssigmetallversprödung ist im Bereich der Stückverzinkung seit vielen Jahrzehnten bekannt. Mit der zunehmenden Anwendung von Zinklegierungen mit hohem Aluminium-Anteil ist die Frage zu klären, wie sich diese Zinkschmelzen im Hinblick auf eine mögliche Flüssigmetallversprödung von Baustählen verhalten. Vor diesem Hintergrund wurde eine Untersuchung durchgeführt zur Bestimmung der Wirkung einer Zink 5 %-Aluminium-Legierung bei der Stückverzinkung auf Baustähle der Güten S355 und S700 und mit Ergebnissen, die in analogen Versuchen in einer konventionellen Zinkschmelze erzielt wurden, verglichen. Weiterhin wurde der Effekt des niedrigschmelzenden Elements Zinn sowohl in der Zink 5 %-Aluminium-als auch der reinen Zinkschmelze untersucht. Hierfür wurden Proben angefertigt und im eingetauchten Zustand in der Zinkschmelze mechanisch belastet. Die Tests zeigen ein durchgehend duktiles Verhalten des Stahls S355 ohne Anzeichen einer Rissbildung oder Reduzierung der Dehnbarkeit

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Section: Specimen Geometrymentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

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Susceptibility of structural steel to liquid metal embrittlement during hot‐dip galvanizing in zinc 5 %‐aluminum alloy

Pinger¹,

Schäfer²,

Geßler

2022

Materialwissenschaft Werkst

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“…7) was developed on the basis of the fracture mechanics CT test, but with a hole containing the hot spot for crack initiation in the zinc melt instead of a sharp crack introduced by fatigue. This so-called LNT test (Long Notched Tension test) allows the application of horizontal forces during the galvanizing process of the specimen that cause local strains at the bottom of the hole to simulate the strain conditions of real large-scale structural components when in contact with the zinc melt [29]. Fig.…”

Section: Strain Capacity: Basic Test To Identify the Role Of The Paramentioning

confidence: 99%

New rules in DASt‐Richtlinie 022 for avoiding liquid metal assisted cracking (LMAC) of prefabricated structural steel components during hot‐dip galvanizing

Feldmann

Pinger²,

Schäfer

et al. 2009

Steel Construction

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Hot‐dip galvanizing is one of the most efficient ways of providing durable corrosion protection for prefabricated steel components. It contributes greatly to the sustainability of steel structures. Technical rules for the design of steel components for zinc coating and for the execution of the hot‐dip galvanizing process have been developed over a period of 100 years. The state of the art has been implemented in the standards EN ISO 1461 [1] and EN ISO 14713 [2] and in recommendations of the galvanizers. It was understood that the technology applied would cover the specific requirements that result from the steel used, the usual way of structural detailing, the fabrication up to the point of galvanizing the steel component and the pretreatment and hot‐dip galvanizing process in the galvanizing plant so that any relevant cracking that might impair the structural safety should not normally occur. Over the years 2000–2006, however, the use of newly developed zinc alloys for the zinc baths [3] – which were introduced at the same time as the use of steel components with larger dimensions and material thicknesses and also with steels of higher strength and with new production techniques, – resulted in significant damages in the shape of the formation of cracks that were filled with zinc and the alloying elements of the zinc melt. The cracks had formed in the zinc bath because zinc melt alloying elements could always be found between the grain boundaries of the steel. Hydrogen embrittlement, which up until then had often been considered as a prevailing hazard, could be excluded; “liquid metal assisted cracking” (LMAC) or “liquid metal embrittlement” (LME), which up to then had been not considered in the design and execution of hot‐dip galvanized steel components and was even not properly mentioned in EN ISO 1461 and EN ISO 14713, could be identified as the relevant cause. A survey of the relevant literature revealed that LMAC in hot‐dip galvanizing had been investigated in studies and tests since 1930 [7]–[23], but only in particular non‐coordinated projects with different approaches depending on the individual problem. These studies provided the first qualitative information, but due to shortcomings in the documentation were not applicable for concluding a general concept. Therefore, new research projects had to be carried out to analyse the LMAC phenomenon systematically, aiming to establish a method that allows quantification of the influences of structural detailing, steel type and semi‐finished products, fabrication of steel components in the workshop and pretreatment and hot‐dip galvanizing in the galvanizing plant in such a way that they can be implemented in a “limit state concept” for LMAC. That would enable clear rules to be derived for all parties involved in the supply of hot‐dip galvanized structural steel components. This work is interdisciplinary because metallurgy, materials mechanics, structural engineering approaches with respect to structural safety, galvanizing technology and simulation tech...

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“…Hierzu wird eine in den plastischen Bereich hinein belastete Baustahlprobe betrachtet, z. B. die LNT-(Long Notched Tension)-Probe, die von flüssiger Zinkschmelze umgeben ist [5], [6], [8].…”

Section: Durch Flüssigmetallversprödung Beeinflusste Dehnbarkeit Des unclassified

Die neue DASt‐Richtlinie zur Vermeidung von Rissbildung beim Feuerverzinken

Feldmann

Pinger²,

Sedlacek

et al. 2008

Stahlbau

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Über gehäufte Risserscheinungen an feuerverzinkten Stahlkonstruktionen einhergehend mit Standsicherheitsproblemen ist in letzter Zeit mehrfach berichtet worden [1] bis [6]. Ein mit zahlreichen Vertretern der betroffenen Industriekreise, der Behörden und der Universitäten sowie Beobachtern aus England und Italien und einem Berater aus Österreich besetzter Unterausschuss “DASt‐Richtlinie Rissfreies Verzinken” wurde deswegen gegründet, in dem eine Technische Regel erarbeitet wird, die die Vermeidung von Rissbildung beim Feuerverzinken von den vielfältigen Ursachen her angeht und die Einzelbeiträge quantitativ in den Zusammenhang eines Grenzzustands der Rissbildung bringt. So werden Zulässigkeitsgrenzen für Stahlbau und Verzinkung angeboten mit der gleichzeitigen Möglichkeit, auch zukünftige Neuentwicklungen zu berücksichtigen. Zusammen mit wesentlichen Ergänzungen zur Überwachung und zu vorhandenen allgemeinen Normen werden Voraussetzungen für das problemlose und weiterhin einfache Feuerverzinken im bauaufsichtlichen Bereich geschaffen. Grundlagen, Ziel und Konzept der neuen DASt‐Richtlinie werden im Folgenden vorgestellt.

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Ermittlung der Rissanfälligkeit von Baustählen beim Stückverzinken

Cited by 12 publications

References 7 publications

Susceptibility of structural steel to liquid metal embrittlement during hot‐dip galvanizing in zinc 5 %‐aluminum alloy

Susceptibility of structural steel to liquid metal embrittlement during hot‐dip galvanizing in zinc 5 %‐aluminum alloy

New rules in DASt‐Richtlinie 022 for avoiding liquid metal assisted cracking (LMAC) of prefabricated structural steel components during hot‐dip galvanizing

Die neue DASt‐Richtlinie zur Vermeidung von Rissbildung beim Feuerverzinken

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