Abstract Elaborated shapes of many car components are the reason for which use casting techniques to fabricate them is a solution well founded from economical point view. Currently applicable regulatory requirements concerning emissions exhaust fumes force carmakers reduce overall weight their products, as this basic precondition reducing fuel consumption. As result, newly launched models contain continuously increasing share thin-walled castings made materials ensure satisfactory level...

Chemical composition and physical parameters of the implant surface, such as roughness, regulate cellular response leading to bone osseointegration. Possible surface modifications include anodization or plasma electrolytic oxidation (PEO) treatment process that produces a thick dense oxide coating superior normal anodic oxidation. Experimental with Plasma Electrolytic Oxidation titanium alloy Ti6Al4V plates PEO additionally treated low-pressure oxygen (PEO-S) were used in this study evaluate...

The paper concerns modeling the microstructure of a hypereutectic aluminum-silicon alloy developed by authors with purpose application for automobile cylinder liners showing high resistance to abrasive wear at least equal that cast-iron liners. With use nanoindentation method, material properties intermetallic phases and matrix in Al-Si containing Mn, Cu, Cr, Ni, V, Fe, Mg as additives were examined. scanning electron microscope equipped an adapter chemical composition microanalysis was used...

Abstract The paper deals with problems related to application of aluminum-silicon alloys for combustion engine cylinder liners.

Abstract The paper presents results of metallographic examination faults occurring in the course founding thin-walled cast-iron castings furan resin sand molds. A non-conformance scab type was Observed on surface casting as well buckles and cold shots. Studied chemical composition by means a scanning electron microscope region defects: microanalysis point surface. Around observed defects discloses high concentration oxides iron, manganese silicon. computer simulation process has been carried...

The research reported in the paper concerned conditions of cooling high-chromium cast iron with about 15% Cr content capable to ensure completeness transformation supercooled austenite into martensite order obtain high hardness value material and thus its resistance abrasive wear. For testing, castings were prepared dimensions 120 mm × 100 15 sand molds which one cavity surfaces was reproduced chills. From castings, specimens for dilatometric tests taken 4 16 plates 50 heat treatment tests....

When manufacturing the welded joints of components made metal–ceramic composites Al-Si/SiC type, we encounter significant difficulties. This is related to presence a ceramic phase in aluminium alloy matrix. The interaction between molten metal matrix and particles weld pool influences complex physicochemical phenomena resulting in, among other things, structure joint. particularly true effect distribution their influence on crystallisation process pool. An important issue reinforcing...

Abstract The cooling rate is one of the main tools available to process engineer by means which it possible influence crystallisation process. Imposing a desired microstructure on casting as early in solidification phase widens significantly scope technological options at disposal aluminium-silicon alloy parts design and application. By changing course thus also material properties individual components. In study reported this paper has been found that increase within range temperatures...

Abstract The paper deals with the effect of microstructure diversified by means variable cooling rate on service properties AlSi7Mg cast alloy refined traditionally Dursalit EG 281, grain refining titanium-boron and modified sodium a variant same barbotage-refined argon simultaneously strontium. For both variants, castings were subject to T6 thermal treatment (solution heat artificial aging). It turned out that after simultaneous barbotage strontium was characterised lower values...

The paper presents results of a study concerning an AlSi7Mg alloy and the effect subjecting liquid metal to four different processes: conventional refining with hexachloroethane; same followed by modification titanium, boron, sodium; purging argon carried out in parallel titanium boron salts strontium; sodium salts.The these processes on compactness material, parameters microstructure, fatigue strength after heat treatment.It has been found that highest (the lowest porosity ratio value) most...

Abstract Technologies which make it possible to improve the working properties of surface layers castings, while utilising traditional materials, are increasingly being used in industrial applications. The life fabrications can be extended as necessary. It is also manufacture fabricates with that normally unobtainable case construction materials and technology.

The research reported in this article has considered the frictional characteristics of three kinds AMS nickel-chromium alloys that are commonly used aerospace industry. These with additions titanium and aluminum AMS5542, alloy AMS5596, non-magnetic, corrosion oxidation resistant, AMS5599. To determine friction coefficient two tribological tests, a strip drawing test pin-on-disc tribometer have been conducted. Three different conditions were considered, dry friction, lubrication using grades...

The relationship between the surface layer microstructure of iron castings after gas tungsten arc weld (GTAW) surfacing and their service properties (friction wear resistance microhardness) has been investigated. A structural analysis fused (remelted) zone, in particular evaluation interphase spacing cementite eutectic λav, is presented. Relationships GTAW process parameters, microhardness zone have developed are Formulae relating hardness to λαv friction rate λav IJCMR/426

Abstract The paper deals with susceptibility of nodular cast iron ferritic-pearlitic matrix on cavitation erosion. Cavitation tests were carried out the use a erosion vibratory apparatus employing vibration exciter operated at frequency 20 kHz. study allowed to determine sequence subsequent stages in which microstructure superficial regions is subject degradation. first features be damaged are graphite precipitates. ferritic alloy turned definitely less resistant compared pearlitic component.

The production of high pressure die casts also brings difficulties regarding the processing waste material.It is mainly formed by runners, overflows and other foundry supplements used and, in case machines using cold chamber, remainder from this chamber.As material often returned to process, we refer it as return material.In therefore essential deal with proportion issue against primary that can be added melt maintain required cast properties.The submitted article monitors quality properties...

Abstract The article presents research results on the microstructure of laser-remelted NiCrBSi coatings deposited with flame spraying. Two types coating powders were used. Commercial Metco 15E powder is strengthened chromium-based carbide and boride phases based a eutectic form Ni(Cr) solid solution matrix borides Ni silicides. second was also but addition 50 mass% metallic tungsten granules. In both cases, identical parameters spraying laser melting processes It found that introducing...