Features of 2017A and AlSi9Mg aluminum alloys friction stir welded with root-side heating

• Autorzy: Mroczka K. , Pietras A. , Jura J.

Identyfikatory

DOI

10.7494/mafe.2016.42.2.105

Warianty tytułu

PL

Właściwości stopów 2017A i AlSi9Mg zgrzewanych metodą friction stir welding z podgrzewaniem grani zgrzeiny

• Języki publikacji: EN

Abstrakty

EN

Aluminum alloys 2017A and AlSi9Mg (hypo-eutectic silumin) were friction stir welded with a relatively high linear velocity (over 1 m/min) and use of an additional heat source from the root side of the weld. Macrostructure investigation (with high-resolution images) showed no effect of heating on weld quality. The welding process caused significant fragmentation of the secondary phases in the AlSi9Mg alloy. Furthermore, it was proven that the material above the weld nugget was not mixed and contained micro-defects that were not caused by welding. Also, it contained cavities on the boundaries between Si-particles and the matrix. Based on hardness distribution, a slight strengthening of the cast alloy was observed at the bottom and middle parts of the weld. However, the hardness of the 2017A alloy initially decreased and then increased due to natural aging. This means that the FSW process produced a metastable state in the alloy.

PL

Stop aluminium 2017A i podeutektyczny silumin AlSi9Mg zgrzewano, stosując metodę friction stir welding (FSW). Zastosowano dużą prędkość liniową, powyżej 1 m/min, oraz dodatkowe podgrzewanie grani zgrzeiny. Badania makrostruktury wykazały brak wpływu podgrzewania na jakość złącza. Proces zgrzewania spowodował znaczną fragmentację faz występujących w stopie AlSi9Mg. Ponadto udowodniono, że materiał występujący powyżej jądra zgrzeiny nie jest mieszany i może zawierać mikrodefekty, które nie powstały w wyniku zgrzewania. Zaobserwowano również nieciągłości na granicach cząstek Si/osnowa. Na podstawie rozkładu twardości stwierdzono niewielkie umocnienie stopu odlewniczego pośrodku dolnej części zgrzeiny. Natomiast twardość stopu 2017A najpierw zmalała, a następnie wzrosła w wyniku starzenia naturalnego. To oznacza, że proces zgrzewania wytworzył metastabilny stan tego stopu.

Słowa kluczowe

EN

aluminum alloys; friction stir welding; heating; structure; mechanical properties

PL

stopy aluminium; nagrzewanie; struktura; właściwości mechaniczne

• Wydawca: AGH University of Science and Technology Press
• Czasopismo: Metallurgy and Foundry Engineering
• Rocznik: 2016
• Tom: Vol. 42, no. 2
• Strony: 105--115
• Opis fizyczny: Bibliogr. 26 poz., rys., tab., wykr.

Twórcy

autor

Mroczka K.

• Pedagogical University of Cracow, Poland

autor

Pietras A.

• Institute of Welding, Gliwice, Poland

autor

Jura J.

• Pedagogical University of Cracow, Poland

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).