Bending damages in galvanized ductile cast irons

Cocco, Vittorio Di; Iacoviello, Francesco; Carlino, Francesco; Natali, S.

doi:10.1016/j.prostr.2018.06.036

Cited by 3 publications

(2 citation statements)

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“…alvanized specimens are analysed by means a LOM with and without chemical etching in order to evaluate the role of graphite nodules during the coating formation (without etching) and the intermetallic phases formation kinetic (by nital 2% etching for 60 s). Considering the observation of unetched coating sections ( Figure 2) it is possible to underline that the presence of graphite nodules is observed also in the coating for each investigated dipping time [19]. Starting from 180 s up to 900 s, it is observed the presence of many dark round zones which can be the effect of carbon dispersed in the zinc.…”

Section: Coating Formation Kineticsmentioning

confidence: 78%

“…More studies, oriented to the intermetallic phases damage, have been carried out [15][16][17][18] in order to better understand the behaviour of the intermetallic phases in tensile and in compression loads. In the last years a new cheap class of cast irons, the Ductile Cast Irons (DCIs) became more and more interested in galvanizing protection [19]. This is due to the performances of DCIs which are characterized by mechanical properties similar to the medium and low carbon steels [20][21][22][23][24].…”

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confidence: 99%

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Intermetallic phase kinetic formation and thermal crack development in galvanized DCI

Bellini

Carlino²

2019

Frattura Ed Integrità Strutturale

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A new class of material characterized by mechanical properties close to the traditional low and medium carbon steel is the Ductile Cast Irons (DCIs). High castability and low production costs allow them to be used in many fields, ranging from automotive to piping. In this class of iron-based alloy the content of carbon is mainly localized in the graphite nodules, which are dispersed in a metallic matrix characterized by different phases: ferrite, austenite, pearlite, martensite or their mix, depending on the chemical composition and the heat treatment. Metallic matrix is subjected to the corrosion phenomenon, and, for this reason, the study and the development of traditional and innovative protection techniques are important, mainly in critical applications. Hot dip galvanizing is one of the investigated protections because the zinc is able to protect the iron-based alloys thanks to the reduction potential that is lower than the iron one. In this work, a ferritic-pearlitic DCI (GS500) is galvanized by using a pure Zn bath at 440°C in order to generate a zinc coating at different dipping time. The presence of thermal cracks is observed by means of a Scanning Electron Microscope (SEM).

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Section: Coating Formation Kineticsmentioning

confidence: 78%