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Your search for microstructure resulted in 40 matches...

MICROSTRUCTURE EVOLUTION DURING PERITECTIC L + Al6Mn(Fe) → α-Al + α-AlMnFeSi PROCESS IN AlFeMnSi ALLOYS


In this work, the course of peritectic L + Al6Mn(Fe) → α-Al + α-AlMnFeSi transformation taking place in AlFeMnSi alloys was traced. The specific microstructural effects in the transformed primary p...

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QUANTITATIVE ANALYSIS OF CAST IRON MICROSTRUCTURE IN TERMS OF THE APPARATUS AND METHODOLOGY


In this work the results of the application of different imaging techniques and image analysis systems for measurements of chosen either stereological parameters or geometrical features for some of morphology model...

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NITROGEN AND BORON EFFECT ON STRUCTURAL TRANSFORMATIONS TAKING PLACE IN DUCTILE IRON DURING AUSTEMPERING TREATMENT


The role of interstitial elements, i.e. nitrogen and boron, in the process of ductile iron solidification and heat treatment of castings was discussed. Austempering of ductile iron aims at obtaining an ausferritic ...

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EFFECT OF TESTING CONDITIONS AND OXIDATION ON WETTING BEHAVIOUR IN Al/Ni SYSTEM


The wettability tests were carried out under a vacuum at 700°C in the drop/substrate couples, where drop is pure aluminium (99.999%), substrate - Ni (99.8%) and Niox (oxidized). Test were carried out...

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SELECTED PROBLEMS OF A TECHNOLOGY OF THE AZ91 MAGNESIUM ALLOY MELT TREATMENT


As expected, the increasing demand for magnesium alloy castings has already become a fact. Considering this situation, a rich program of the studies on this particular subject has been initiated and put into operat...

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RECYCLING OF WASTE FLY ASH FORMED DURING COMBUSTION OF HARD COAL FOR USE IN MOULDING MIXTURES MANUFACTURE


The article is a compilation of the most important results obtained during execution of own research project regarding the possibility of using fly ash formed during combustion of hard coal as a base granular material ...

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THE EFFECT OF Ca ADDITION ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AZ91 ALLOY


This paper presents the results of research work related with the effect of calcium on the microstructure and mechanical properties of AZ91 alloy. Samples of appropriately prepared alloy grades containing the addition of calcium in different conce...

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CHANGES IN THE MICROSTRUCTURE OF PA9 ALLOY UNDER THE EFFECT OF SQUEEZE PRESSURE


This paper presents the results of research on an impact of external pressure applied in the squeeze casting process on the structure of PA9 alloy. Samples for the research were obtained by casting the tested PA9 alloy into a die under a varying p...

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THE ASSESSMENT OF CHANGES OF THE STRUCTURE OF DUCTILE CAST IRON DEPENDING ON THE TIME AND TEMPERATURE OF THE METALLURGIC PROCESS


The results of technological tests (chemical composition, solidification curves, microstructure) of ductile cast iron smelting in the Foundry Research Institute in an induction furnace. In the case of crystallization of spheroidal graphite no long...

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CAST Al-Si MATRIX COMPOSITES REINFORCED WITH INTERMETALLIC PHASES


In the present paper research results of microstructure and selected mechanical properties of composite on EN AC-AlSi11 alloy matrix with reinforcement in the form of particle of Cr-Fe-C alloy (composite ex situ) and carbonitrides Ti, Zr, V (compo...

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THE COMPARISON OF THE MICROSTRUCTURE AND THE MECHANICAL CHARACTERISTIC OF AUSTEMPERED DUCTILE CAST IRON AND STEEL SUBJECT TO DYNAMIC DEFORMATION USING THE TAYLOR TEST


The article attempts to compare the resistance of austempered ductile cast iron and S215 steel to dynamic loads. The samples were subject to research using the Taylor test methodology at different speeds of deformation, in order to determine the c...

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EFFECT OF SUBSTRATE OXIDATION OF NICKEL ON WETTING BEHAVIOUR IN INDUSTRIAL ALLOY 226D/Ni SYSTEM


The aim of this study was to determine the impact of technological factors (surface treatment and contact time) on the kinetics of wetting of nickel substrates by a liquid aluminum alloy. Wetting kinetics studies were carried out in vacuum at 700&...

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The exploitation of TTT diagrams in the CAPCAST system


The presented paper is a description of one of the modules of the CAPCAST system which allows determination of recommended materials made of ductile cast iron which show specific properties or may achieve the desired properties after an appropriat...

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The use of TTT diagrams of low-alloy ductile cast iron to develop a technology for the production of ADI


The presented paper is a description of the significance of CCT and TTT diagrams in the processes of heat treatment of ductile cast iron, and especially during the production of ADI. A review of literature in the subject was made. Own research inc...

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Analysis of the chemical composition of AlMnFe and AlFeMnSi intermetallic phases in the interdendritic eutectics in the Al-alloys


In this study a simple procedure for the in situ identification of the intermetallic phase precipitates in the interdendritic eutectic in both wrought and cast AlFeMnSi alloys has been established and then verified by ...

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The optimisation of heat treatment parameters for selected cast AlZnMgCu(Mn) alloys


The publication presents the results of optimisation of parameters of complex heat treatment of as-cast AlZnMgCu(Mn) alloys consisting in retrogression and reaging (RRA, Retrogression and Re-aging). For comparison...

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Research on ablation casting technology for aluminium alloys


The article presents preliminary results of research on ablation casting technology. The guidelines for the design of equipment to carry out the process are described. Based on the above mentioned instructions a test stand was developed and built....

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Computer simulation of stresses occurring as a result of applied heat treatment


On the basis of assumed curves of treatment the distribution of temperature fields was determined in selected model castings achieved during heat analysis, then assuming these values as boundary conditions an integrated strength analysis was carri...

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Tests to produce a white cast iron die casting


The manufacturing of cast iron castings by pressure die casting method, evaluation of castings microstructure and process analysis were the purpose of the experiments. White cast iron castings were fabricated and then these castings were annealed....

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Shaping the microstructure and properties of silumin castings in molds cooled with water mist


The paper presents the possibility of obtaining highquality silumin castings with enhanced mechanical properties. It ensures the effective use of the multipoint water mist cooling system which is managed by a dedicated computer program....

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Effect of tungsten on the solidification process, microstructure and properties of silumin 226


The effect of tungsten on the solidification process, microstructure and mechanical properties of silumin 226 under the conditions close to equilibrium during pressure die casting was discussed. An increase in both mechanical and plastic propertie...

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High-temperature oxidation of cast steel in water vapour


The article presents the results of studies of the oxidation process conducted at 900°C for 12 hours in an atmosphere of water vapour on cast heat-resistant steel with a diversified structure (ferritic-austenitic, austenitic, and austenitic wi...

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The microstructure and properties of cast alloyed G200CrNiMo4-3-3 steel


The subject of the study is the analysis of the microstructure and mechanical properties of cast G200CrNiMo4-3-3 steel. The investigated alloyed cast steel, containing approximately 2% C, is nearly an ideal material for the hot mill work rolls, an...

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New ledeburite cast steel with precipitation hardened matrix


A new ledeburite cast steel was designed based on a matrix precipitation hardened with intermetallic compounds of a chemical composition enriched by adding about 4.25% V totally balanced with carbon. A martensitic-austenitic matrix with a ledeburi...

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The AlFeMnSi intermetallics competition in the interdendritic eutectics in AlSi cast alloys influenced by cooling rate and transition metals content


Microscopic observations and quantitative analysis of the microstructure image were used to analyze the solidification course and morphology evolution in polyphase eutectics in the AlSi casting alloys with transition metals Fe and Mn. The utility ...

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Structural determinants of the mechanical properties of A359 + Al2O3 composites after multiple remelting


The article discusses the possibilities of applying direct multiple remelting as an easy as well as substantially and economically justified method of recycling composites with an A359 alloy matrix reinforced with Al2O3 parti...

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Effect of molybdenum on the crystallization, microstructure and properties of silumin 226


The article presents the results of studies of hypoeutectic silumin with a molybdenum addition used for pressure casting. The studies included a thermal-derivative analysis of the crystallization process, a metallographic analysis of the microstru...

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Microstructure of selected 7xxx series aluminum alloys obtained by semi-continuous casting


The study was conducted for two selected 7xxx series aluminum alloys according to PN-EN 573-3:2010 - Polish version. The analysis of ingots was carried out on 7003, 7003S and 7010, 7010K alloys with a similar ratio of zirconium content. Symbols S ...

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Perspectives and directions of the development of new generation lead-free soldering alloys and their application possibilities in the consumer electronics lead-free soldering technology


The new technological challenges and the high economical and commercial potential connected with the development of new generation soldering alloys used in the consumer electronics lead-free soldering technology is a subject which is gaining incre...

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Analysis of non-metallic inclusions in AZ91 alloy casts with process foundry return in high-pressure die casting


The article presents research results of the process foundry return influence in the AZ91 alloy charge on the change in the structure of castings made by the high-pressure casting method, with special consideration of the formation of non-metallic...

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Optimization of grain refinement and modification of the eutectic in hypo- and transeutectic Al-Si alloys


The procedures of grain refinement and modification of a silicon eutectic in hypo- and transeutectic silumins belong to important factors shaping their microstructure as well as physico-mechanical and technological properties. Due to this fact, th...

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Stability of metal-ceramic slurry after multiple re-melting of A359 aluminum alloy based composite reinforced with Al2O3 particles


The sessile drop method was adopted to investigate the effect of multiple re-melting and casting of metal matrix composite on the structural stability of metal-ceramic slurry. Commercial aluminum matrix composite made of the A359Al alloy reinforce...

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Effect of vanadium on the crystallization process, microstructure and properties of Al-Si alloy EN AC-46000


The paper presents the results of the study of Al-Si alloys with a vanadium addition used in pressure casting. The hypoeutectic Al-Si alloy grade EN AC-46000 was applied as the initial alloy. The master alloy AlV10 was introduced into the initial ...

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The evaluation of microporosity and mechanical properties in high strength aluminum alloys with the use of numerical analysis and computed tomography


One of the aspects of sustainable development is the reduction of the concentration of CO2 in the atmosphere. This could be achieved for example by the reduction of fuel consumption. That is why the research for the new construction and...

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Influence of TiN nanoparticles on the microstructure and hardness of arc overlaid welding layers


Electrodes for manual arc overlay welding with coating containing nanomodifier TiN in concentrations between 0.2% and 1.5% were developed and manufactured. Samples of welded overlay layers with electrodes were both examined by electron microscopy ...

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Electrolyte coatings of chromium with nanodiamonds on sintered steels


Sintered ferrous components were coated with electrochemical chromium coatings modified with nanodiamond particles. The nanodiamond particles were produced by detonation synthesis with an average grain size 8 nm. The objective of this study was to...

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A comparison of the oxygen, nitrogen and hydrogen content in ductile iron castings and their effect on microstructure and mechanical properties


Two different spheroidization methods were compared in terms of the effect they may have on gas content (oxygen, nitrogen and hydrogen) in ductile iron castings and process efficiency.Two methods of cast iron treatment were investigated, i.e...

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Tribological characterization of high porosity aluminum based composite materials


The present work aims to study the effect of the reinforcing phase on dynamic coefficient of friction and mass wear of specimen with different compositions under various friction conditions.Porous materials with different compositions and re...

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Alternative technology of obtaining ausferrite in the matrix of spheroidal cast iron


This study presents selected issues regarding the process of obtaining ausferrite from spheroidal cast iron without the application of thermal treatment to the casts. An ausferritic matrix, as well as strong mechanical properties, also ensures hig...

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Effect of chromium on the crystallization process, microstructure and properties of hypoeutectic Al-Si alloy


The paper presents the results of studies of hypoeutectic silumin with a chromium addition used for pressure casting. A silumin with the composition similar to that of EN AC-46000 was used as the initial one. In order to introduce chromi...

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