HUTNICTWO, GÓRNICTWO ›
INŻYNIERIA MATERIAŁOWA ›
2007-3-4 |
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Design, brazing and characterization of metal - ceramics joints
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JOLANTA JANCZAK-RUSCH 
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Vacuum brazing is a reliable and cost-effective process for
production of metal-ceramics joints. The main problem encountered
in brazing metal to ceramics is to achieve optimal wetting of the
ceramic substrate by the molten filler metal. Even if a strong
metallurgical bond is achieved, residual stresses induced during
processing can become intolerable and lead to the joint failure. A
short o[...]
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Effect of ageing on microstructure and impact properties of 9Cr-1Mo steel
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JOANNA HUCIŃSKA
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The influence of long term ageing on microstructure and impact properties
of three commercial 9Cr-1Mo steels has been examined. Previous
investigations indicated the occurrence of temper embrittlement of 9Cr-1Mo
steel after ageing at 550C for 10000 h, and the formation of brittle Laves
phase (Fe,Cr)2Mo at grain boundaries after longer times. This results in an
increase of ductile-brit[...]
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Experimental and computational results of porous silicon formation
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JAROSŁAW JAKUBOWICZ
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The properties of porous silicon prepared at different illumination and
electrochemical conditions were studied. Here, the illumination was applied
from the backside of the wafer (side not immersed in the electrolyte), from the
topside (side immersed in the electrolyte), and for the highly doped silicon,
etching proceeds without illumination. The electrolyte contains HF in the
range of 2-50 w[...]
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Gradient Materials on Aluminium Alloy Basis Obtained from Powders by Hot Forming
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STEFAN SZCZEPANIK
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The paper deals with the manufacturing of multi-layer and gradient materials
from aluminium and aluminium alloys. The materials were prepared by hot
closed-die forging, extrusion and hot consolidation. The formability of multilayer
materials was studied at 400oC at the strain rate of 1 s-1. The multilayer
preforms and preforms with a continuous gradient of chemical composition
were closed-die[...]
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Gradient structure of ductile cast iron
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TOMASZEWSKA AGNIESZKA WOŹNICA HENRYK
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In the article results of a research of the structure of EN-GJS-400-15 grade
with a ferritic-pearlitic cast iron in a sample with a changeable thickness of its
wall have been presented. An assessment of basic qualities of a graphite
precipitations and the matrix of cast iron has been made. Relations in the
amount of a graphite precipitations and the ratio of ferrite to pearlite in the
structu[...]
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Hydrogen Embrittlement of Austenitic-Ferritic Steel
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ANNA GŁOWACKA ADAM GOŁASZEWSKI WIESŁAW ŚWIĄTNICKI
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A fracture of the austenitic-ferritic steel subjected to tensile tests
during hydrogen charging has been investigated using scanning
electron microscope. It has been shown that hydrogen charging
considerably reduces ductility and leads to a brittle fracture which
remains ductile in the non-charged samples. The effect of hydrogen
charging and tensile test conditions on fracture characteristics[...]
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Laser surface re-melting of borided layer
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ALEKSANDRA PERTEK MICHAŁ KULKA KRZYSZTOF WIŚNIEWSKI
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Influence of laser surface modification with re-melting on structure
and properties of borided 41Cr4 steel was investigated.
Microhardness and wear resistance of surface layer was tested.
Crystallite sizes after laser treatment were estimated from half-width
of XRD lines using Scherrer method. Surface layer properties after
laser modification have been compared with the results after classic
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Measurement of Fe-Cr-Ni coatings density in XRD analysis
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BARBARA KUCHARSKA
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The article presents the measurement of the density of heat-resisting steel
coatings using X-ray methods, XRD and GXRD. Coatings of a thickness of
8.5m deposited by the magnetron method were tested using targets made of
AISI310S steel on a substrate of the same steel. The coatings were deposited at
a negative table polarization voltage of -50V and an Ar flow pressure of 0.03
Pa. By us[...]
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Mechanical properties of nickel alloy with intermetallic surface layers
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HALINA GARBACZ
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Multi-layer Al2O3+Ni-Al coatings were produced on Inconel 600
by the glow discharge assisted oxidizing of the substrates pre-coated
with aluminum by magnetron sputtering. The layers have a diffusive
structure and can be produced on parts of complicated shapes. The
Al2O3 layer formed on intermetallic Al-Ni increases its hardness (7,2
GPa) and wear resistance.
This paper is devoted to the infl[...]
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Microstructure of mechanically alloyed Nb15Al10Ti
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MAGDALENA ROZMUS MAREK BLICHARSKI STANISŁAW DYMEK
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The goal of this work was to produce Nb15Al10Ti (at. %) alloy by
milling powders of Nb, Al and intermetallic TiAl phase, via high
energy mechanical alloying and microstructure characterization of the
investigated alloy. Powders after particular time of milling were taken
out to analysis and were investigated by Scaning Electron Microscopy
(secondary electrons, backscattered electrons) as well[...]
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Modification of surface layer of titanium alloy by laser alloying
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RYSZARD FILIP
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The paper presents the results of the laser alloying of Ti-6Al-4V
titanium alloy through remelting surface layer with applied SiC
powder case. It was carried out to modify the microstructure and
properties of the treated zone. Laser process was performed on
samples coated by SiC and C powders in stream of argon in order to
form the complex microstructure in the consequence of laser
irradiati[...]
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Nanostructuring of metals by hydrostatic extrusion
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MAŁGORZATA LEWANDOWSKA
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Nanostructured metals which exhibit superior properties to their
microcrystalline counterparts are prospective materials for large
number of applications. As a consequence, there is a great interest in
the development of fabrication methods. Currently available methods
suffer from a relatively low scale of production and low cost
effectiveness. In this context, the possibility of forming
nan[...]
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New way of forming the optimum microstructure of two-phase TiAl based alloys
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WOJCIECH SZKLINIARZ
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Based on the available literature data and our long-term experience, this
paper characterises the microstructure of two-phase TiAl based alloys, its
influence on properties of the alloys, and possibilities of forming it in
manufacturing processes. It presents a new original way of forming the
microstructure that is regarded as the optimum for this group of alloys, without
plastic deformation,[...]
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Ni5Zr+V' eutectic in Ni3Al-Cr intermetallic alloy
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MIROSŁAW PILAWA ELŻBIETA JEZIERSKA
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The paper discusses detailed transmission electron microscopy
investigations of as-cast samples of Ni3Al-based intermetallic alloy. Due to
strong chemical microsegregation in the interdendritic regions different
secondary phases were present: Ni5Zr+' eutectic and L10 martensite. Attention
is focused on morphological features and chemical composition of the eutectic.
It was found that [...]
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Oxidation resistant FeAlCrSi and SiCx coatings on ferritic AISI 430 SS steel
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BOGDAN G.WENDLER SUN BIN
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Ferritic stainless steels are widely used in household goods, automotive
industry, water heaters, solid oxide fuel cells, fusion reactors and many others
owing to (among others) their good corrosion resistance, heat resistance and
good appearance. One of critical issues for further applications is oxidation and
oxide scale formation on the surface of these alloys at high temperatures. In
this[...]
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Polyphase Sintering of Copper - Iron - Iron Boride Cermets
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JERZY NOWACKI
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Polyphase sintering of iron, copper and boron powder mixture of
concentration of 5 - 15 wt. of copper and 9 wt. of boron has been
analyzed. It was found that an addition of copper to a powder mixture
allows full controlling the quantity of liquid phase during the sintering
by the mass concentration of Cu. Structure and properties of the
generated cermets can be changed over a wide range depen[...]
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Revealing and evaluation of carbides in MAR M247 Ni based superalloy
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AGNIESZKA SZCZOTOK
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The work presents carbide phases occurring in a structure of MAR
M247 Ni based superalloy. The ways of revealing these phases and
results of using optical, scanning electron and transmission
microscopy as well as X-ray phase analysis for researches are
presented (Fig. 1÷10). The author’s attention has been concentrated
on the carbides morphology and places of occurrence.
INTRODUCTION
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Stress relaxation in ceramic-elastomer composites
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KATARZYNA KONOPKA ANNA BOCZKOWSKA
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The present paper describes the properties of ceramic-polymer
composites obtained via infiltration of porous SiO2 by polynitrileurea-
urethane elastomer.
The composites exhibit a high compression strength together
with the ability to sustain large deformation. The presence of the
elastomeric phase prevents the composite from rapid failure. The
elastomer overlaps the ceramic skeleton and prev[...]
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Structural tensegrity in materials science
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ELŻBIETA JEZIERSKA
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The three-dimensional architecture of dislocation network on grain
boundary as well as self-assembly formation of polytwinned structure
can be described in terms of tensegrets, i.e., structural elements that
are held together through attractive and repulsive forces.
Tensegrity concept is used to indicate the balance among tension
and compression that causes same objects to maintain their stru[...]
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Surface treatments of magnesium alloys
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JERZY ROBERT SOBIECKI
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The magnesium and its alloys have increasingly been used in various fields
of industry because of high relative strength. However this material exhibits
low corrosion and wear resistance. These properties could be improved by
surface engineering treatments. The paper presents the review of surface
treatments which are nowadays applied to magnesium alloys. The coatings
produced by chemical and[...]
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Texture Analysis in Die-Upset Forged Nd-Fe-B Magnets
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DANIELA DEREWNICKA HANNA KRZTOŃ MARCIN LEONOWICZ
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Die-upset forging of Nd-Fe-B magnets results in the production
of anisotropic crystallographic structure. The degree of anisotropy
depends on the parameters of the deformation process. The
investigation of the crystallographic orientation has been carried out
using transmission electron microscopy. It has been found that
directional crystal growth is the dominant mechanism during the early
s[...]
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Transport properties in calcium-doped cobalt oxide
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ŁUKASZ CIENIEK JAN KUSIŃSKI GUIDO BALDINOZZI CLAUDE PETOT GEORGETTE PETOT-ERVAS
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In this work, experimental data on electrical conductivity,
Seebeck's effect and diffusion, of (Co,Ca)O single crystals (0.26,
0.84, 2 and 4.43 mol % CaO), are discussed. For oxygen partial
pressures higher than 10-3 atm, we have found  values close to
those obtained for the undoped oxide. Furthermore, TLM and TEM
examinations, coupled to EDS and EELS analyses, revealed the
pre[...]
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Tribological properties of sliding materials containing glassy carbon
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MYALSKI JERZY ŚLEZIONA JÓZEF
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The paper presents the results of research into mechanical and
tribological properties of materials with a polymer matrix intended for
work in friction couples under heavy load conditions. Apart from
traditional fillers, such as graphite or brass, glassy carbon was used
for the modification of the properties. Based on studies of the friction
coefficient and the wear, usefulness of glassy carb[...]
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