Characterization and wear resistance of laser surface melting AZ91D alloy

Ye, Jun; Sun, Guixun; Jia, Siqi

doi:10.1016/j.jallcom.2007.01.047

Cited by 37 publications

(19 citation statements)

References 12 publications

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“…This was not observed in the remelted zone, which proves that the remelting process caused a more uniform distribution of alloy components with reference to the non-remelted material. Analogous observations were made by the authors of study [18]. Besides, the EDX investigations showed a lack of essential changes in the concentration of oxygen in the remelting area when compared with the material of the core.…”

Section: Resultssupporting

confidence: 82%

“…The changes in both the structure and the morphology of phases triggered this way may lead to creating a material with a new spectrum of properties [1][2][3][4][5][6][7][8][9][10][11]. Modification of magnesium alloys surface layer is an interesting research issue of a high application potential [12][13][14][15][16][17][18][19]. These materials, rated as the most innovative and prospective metallic materials, are distinguished by low density and high specific strength.…”

Section: Introductionmentioning

confidence: 99%

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Structural Aspects of Remelting of the AZ91 Magnesium Alloy Surface Layer

Iwaszko

Strzelecka²

2016

Archives of Foundry Engineering

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In this study, modification of the AZ91 magnesium alloy surface layer with a CO 2 continuous wave operation laser has been taken on. The extent and character of structural changes generated in the surface layer of the material was being assessed on the basis of both macro-and microscopy investigations, and the EDX analysis. Considerable changes in the structure of the AZ91 alloy surface layer and the morphology of phases have been found. The remelting processing was accompanied by a strong refinement of the structure and a more uniform distribution of individual phases. The conducted investigations showed that the remelting zone dimensions are a result of the process parameters, and that they can be controlled by an appropriate combination of basic remelting parameters, i.e. the laser power, the distance from the sample surface, and the scanning rate. The investigations and the obtained results revealed the possibility of an effective modification of the AZ91 magnesium alloy surface layer in the process of remelting carried out with a CO 2 laser beam.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Structural Aspects of Remelting of the AZ91 Magnesium Alloy Surface Layer

Iwaszko

Strzelecka²

2016

Archives of Foundry Engineering

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“…Currently, the concept of functional lightweight materials is a priority and the most investigated worldwide field of material science and engineering concerning the production and processing of new developed engineering materials. Previous studies about the effects of laser beam effect on various materials, including magnesium alloys as well as tool steels, based on the authors own long-term investigation, summarizing the experience of laser surface treatment reveal that, there are chemical composition and structure changes which are different from those occurring during conventional heat treatment [9,[17][18][19][20][21][22][23][24][25][26][27]. This causes, that the laser treated elements shows higher hardness (especially for TaC alloyed steel surface - Fig.…”

Section: Investigation Resultsmentioning

confidence: 99%

“…It was also found that the examined layers consists of three subzones -the remelted zone, the heat influence zone with a dendritic structure and the substrate material (Fig. 25) [26][27]. Further investigations should revealed the exact morphology and nature of these sublayers after alloying with different ceramic powders, different process parameters.…”

Section: Investigation Resultsmentioning

confidence: 99%

Long-Term Development Perspectives of Selected Groups of Engineering Materials Used in the Automotive Industry/ Długoterminowe Perspektywy Rozwoju Wybranych Grup Materiałów Inżynierskich Stosowanych W Przemyśle Motoryzacyjnym

Tański¹,

Dobrzańska-Danikiewicz²,

Labisz³

et al. 2014

Archives of Metallurgy and Materials

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The purpose of the article is to present the results of comparative quantitative analysis of selected materials (steel, magnesium and aluminium alloys) and manufacturing technologies, to indicate their development outlooks and to present its application opportunities particularly in the automotive industry. Moreover in this article describes the application of the computer-integrated prediction of development for objectivised selection of a material and surface treatment technology, so that product properties can be achieved as are expected by a client. In a broad array of applications of the computer-integrated prediction of development in the field of material engineering, including materials surface engineering, experiment planning can be distinguished, usually including the selection of: a research material, surface treatment technology, construction solution and/or methods to review the final outcome achieved against the anticipated outcome. A material for the planned materials science experiments and its surface treatment technology, the application of which contributes most to meeting the high requirements set by a prospect product used, was selected in this work using a dendrological matrix of technology value. The dendrological matrix falls into to a group of contextual matrices allowing presenting graphically a quantitative assessment of the factor, phenomenon or process investigated while taking into account two analysis factors placed on the X and Y axis of the matrix. An evaluation classifying the three groups of materials analysed, i.e. casting magnesium alloys, casting aluminium alloys, constructional steels and their surface treatment technologies, to the individual quarters of the matrix was made based on the results of own materials science and heuristic experiments supported with a review of the literature.Considering the three groups of materials subjected to an expert assessment using a dendrological matrix being inherent part of materials surface engineering development prediction methods. Aluminium cast alloys has achieved here the best position. It was further demonstrated that laser treatment is a technology with the highest potential and attractiveness in the context of applying aluminium casting alloys for surface treatment. The metallographic examinations carried out give grounds to state that the ceramic powder alloying or feeding process will be carried out successfully in case of the aluminium alloy substrate, the powder particles will be distributed uniformly in the investigated surface layer, and that the particular layers is without cracks and failures and tightly adhere to the cast aluminium material matrix.With regard to the above, dynamic development achieved by exploitation of numerous application and development opportunities, especially strong prospects in the automotive industry, aviation industry, military sector, sport sector and in civil engineering is a recommended by appliance of long-term action strategy.Keywords: engineering materials, surface treatment, automotive...

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“…Experimental verification of the applied apparatus solutions was based on both macro-and microstructural assessment of the obtained effects. Comparative analysis of the variants used and the obtained microstructural results allowed the authors to indicate the deficiencies and limitations of particular solutions and to single out the best solution that would be useful for modifying the surface layers of magnesium alloys, as well as other materials having a strong oxygen affinity.Key words: remelting treatment, GTAW technology, AZ91 magnesium alloy.Surface modification of AZ91 magnesium alloy using GTAW technology [14][15][16][17][18][19]. To this end, both lasers with continuous operation characteristics and pulse lasers are used.…”

mentioning

confidence: 99%

Surface modification of AZ91 magnesium alloy using GTAW technology

Iwaszko

Strzelecka

Kudła

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. In this study, surface remelting treatment of the AZ91 magnesium alloy by means of welding using a non-consumable electrode in an inert gas shield was carried out. Three variants of surface treatment were used, i.e. the single torch variant with a single heat source without cooling down the samples, the single torch variant with a single heat source and a cooling system with liquid nitrogen, and the double welding torch variant with a double heat source in the torches operating in a tandem configuration. Experimental verification of the applied apparatus solutions was based on both macro-and microstructural assessment of the obtained effects. Comparative analysis of the variants used and the obtained microstructural results allowed the authors to indicate the deficiencies and limitations of particular solutions and to single out the best solution that would be useful for modifying the surface layers of magnesium alloys, as well as other materials having a strong oxygen affinity.Key words: remelting treatment, GTAW technology, AZ91 magnesium alloy.Surface modification of AZ91 magnesium alloy using GTAW technology [14][15][16][17][18][19]. To this end, both lasers with continuous operation characteristics and pulse lasers are used. Among the advantages of using the laser beam one can mention is the short time of process execution, the possibility of precise concentration of the beam on a particular surface, as well as obtaining high temperature gradients in the material. The use of methods that are alternative to laser technologies, e.g. conventional welding arc heat sources, is sporadic. Difficulties may occur during the remelting treatment carried out by means of welding methods. Those difficulties are often the effect of the physical and chemical properties of magnesium and magnesium alloys, and particularly their strong oxygen affinity, whose consequence is the presence of a compacted, non-conductive MgO oxide layer on the material surface. Until recently, welding heat sources were used almost only for joining materials and their regeneration. This situation has been systematically changing in recent years. The GTAW method has been used, among others, by the authors of study [20], who subjected the AK7 aluminium alloy to surface treatment. The favourable microstructural changes triggered by remelting of the alloy resulted in an increase in hardness and resistance to abrasion. In turn, in study [21] iron castings were subjected to GTAW method treatment, and equally satisfactory treatment results were obtained. The GTAW method was used also by D. Wenbin et al. in study [22] to form a composite structure in the surface layer of the AZ31 magnesium alloy. Within this study assessment of the GTAW method effectiveness in the remelting treatment of the AZ91 magnesium alloy surface layer was conducted, as well as the comparative analysis of various apparatus and parameter variants.

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Characterization and wear resistance of laser surface melting AZ91D alloy

Cited by 37 publications

References 12 publications

Structural Aspects of Remelting of the AZ91 Magnesium Alloy Surface Layer

Structural Aspects of Remelting of the AZ91 Magnesium Alloy Surface Layer

Long-Term Development Perspectives of Selected Groups of Engineering Materials Used in the Automotive Industry/ Długoterminowe Perspektywy Rozwoju Wybranych Grup Materiałów Inżynierskich Stosowanych W Przemyśle Motoryzacyjnym

Surface modification of AZ91 magnesium alloy using GTAW technology

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