Wyniki wyszukiwania - BazTech

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Wpływ wybranych parametrów spawania łukowego na jakość złączy odlewniczych stopów magnezu

Tuz L., Kolasa A.

Przegląd Spawalnictwa

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2013

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R. 85, nr 2

45-49

PL

W artykule przedstawiono wpływ wybranych parametrów spawania łukowego na jakość złączy spawanych odlewniczych stopów magnezu należących do grupy Mg-Al-Zn. W badaniach zastosowano dwie metody spawania łukowego w osłonie gazów obojętnych: elektrodą topliwą (MIG) i nietopliwą (TIG). Przedstawiono wyniki obserwacji wizualnych wykonywania złączy doczołowych, oraz ich ocenę makroskopową. W pracy skoncentrowano się na określeniu wpływu takich parametrów jak: rodzaj i natężenie prądu, napięcie łuku i prędkość spawania na wartość energii liniowej wykonywanych złączy oraz ich jakość (brak pęknięć gorących i porowatości).

EN

The paper presents results of an experimental studies of the influence of some arc welding parameters on weldability of Mg-Al-Zn cast magnesium alloys. The metal inert gas (MIG) and tungsten inert gas (TIG) arc welding were chosen for the test. Results of visual inspection and macrostructure analysis of butt welds are presented. The main aim of the study was to assess the influence of polarity, welding speed, current and voltage on the shape of welds. It allowed to determine the value of necessary for linear energy input in order to obtain welded joints without hot cracking and porosity hazard.

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Precipitation evolution and surface modification of magnesium alloys

Tański T., Król M., Dobrzański L.A., Malara S., Domagała-Dubiel J.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 61, nr 2

87--149

EN

Purpose: The purpose of this publication is to present the results of own long-term research summarising the experience concerning as casting magnesium alloys, and in especially a thermal analysis describing the process of alloys crystallisation, standard heat treatment according to the occurring phase transitions and precipitation processes, surface treatment with the CVD and PVD methods, laser surface treatment of surface layers, as well as using the methods of Computer Materials Science. Design/methodology/approach: The research concerned in the first place an analysis of Mg-Al-Zn alloys crystallisation kinetics. Optimisation investigations for heat treatment conditions taking into consideration different cooling mediums were performed in order to identify fully the structure of the investigated magnesium casting alloys. Investigations were carried out of the structure and properties of coatings produced with the CVD and PVD methods on the investigated Mg-Al-Zn alloys. The last stage of investigating the presented Mg-Al-Zn alloys applied to laser surface treatment enabling to produce a quasi-composite structure of MMCs characterised by the gradient of phase composition as well as functional properties by feeding hard ceramic particles, in particular carbides and oxides, into the surface of the materials produced. Findings: Valuable and original results were achieved based on the broad scope of the research performed both, in cognitive and applicational terms, concentrated mainly on the analysis and influence of chemical composition and technological heat and surface treatment processes on the structure and properties of the investigated alloys. Practical implications: The properties of the core and surface layer of the part produced can be customised most advantageously by selecting the part’s material and its structure and properties formation processes appropriately along with the surface layer type and technology ensuring the required functional properties. Originality/value: The knowledge gathered for years concerning light metal alloys, and in particular Mg-Al-Zn alloys, of an undoubtedly valuable cognitive character, is dedicated not only to students but also postgraduates and researches to improve the conditions of education.

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Quantitative procedure for evaluation of microstructure of cast Mg-Al-Ca-Sr magnesium alloy

Rzychoń T.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 1 spec.

139--142

EN

In this paper the microstructural characterization of ingot MRI-230D magnesium alloy and quantitative procedure for evaluation of microstructure are presented. The optical and scanning electron microscopy were used to study the morphology of microstructural compounds in this alloy. The X-ray diffraction was used to determination of phase composition. The as-cast microstructure of MRI-230D magnesium alloy containing aluminum, calcium and strontium consists of the dendritic α-Mg and such intermetallic compounds as: Al2Ca, Al4Sr and AlxMny. In the purpose quantitative description of microstructure semi-automatic procedures using Met-Ilo image analysis were developed. Prepared semi-automatic procedures allow a fast determination of phase content in MRI-230D alloy using light microscopy and will be useful in the quality control of MRI-230D ingots.