Cracking behavior and formability of Zn-Al-Mg coatings
| Autor: | Bart J. Kooi, Bekir Salgın, Masoud Ahmadi, Yutao Pei |
|---|---|
| Přispěvatelé: | Advanced Production Engineering, Nanostructured Materials and Interfaces |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Cracking
Digital image correlation Materials science Steel substrates Mechanical Engineering technology industry and agriculture Lüders banding Microstructure Corrosion Mechanics of Materials Ultimate tensile strength mental disorders TA401-492 Formability General Materials Science Zn-Al-Mg coatings Deformation (engineering) Composite material Materials of engineering and construction. Mechanics of materials Electron backscatter diffraction |
| Zdroj: | Materials & Design, Vol 212, Iss, Pp 110215-(2021) Materials & design, 212:110215. ELSEVIER SCI LTD |
| ISSN: | 0261-3069 |
| DOI: | 10.1016/j.matdes.2021.110215 |
| Popis: | Zn-Al-Mg coatings are important materials for the corrosion protection of steel sheets. However, susceptibility towards cracking limits the formability performance of these coatings. In this study, we focus on the effect of the underlying steel substrate on cracking behavior in these coatings. In order to elucidate this, a high-strength low-alloy (HSLA) steel substrate and an interstitial-free (IF) steel substrate are coated with two different ZnAlMg coatings with and without binary eutectic microstructures. Meticulous in-situ tensile and bending tests are conducted in a scanning electron microscope. To quantify the strain distribution and damage incidents, micro and macro digital image correlation techniques are utilized in order to illuminate the associated cracking causes across length scales. Furthermore, electron backscatter diffraction method is applied to study the role of crystallographic orientation on the cracking tendency. Crack opening and crack area fractions are correlated with the applied strain and bending angles. The findings denote that the discontinuous yielding (Luders banding) of the HSLA steel substrate generates substantial surface roughening and heterogeneous deformation in the coatings that facilitates cracking. In contrast, the IF steel induces a more uniform deformation within the coatings leading to much reduced crack size and crack area fraction. This study has resulted in a key element of a guideline towards crack-resistant and formable Mg-alloyed zinc coatings. |
| Databáze: | OpenAIRE |
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