6 results listed
A composite surface layer of wear plate
was manufactured by using centrifugal casting and M7C3
carbide
particles as reinforcement. Spherical cast iron was chosen as
matrix material. During casting, the machine was operated
at 50-500 rpm. The samples were microstructurally
characterized by optical microscopy. Energy Dispersive
Spectrometer (EDS) and X-ray Diffraction (XRD) were used to
determine chemical compositions of carbides and the
microstructure of the composite structure. The carbide
reinforcement powders were arranged in the thick composite
layer of 300-1600 µm thickness on the sample surfaces by
centrifugal casting. The increase of the reinforcement size,
amount and revolution of the casting increased the thickness
of the composite texture.
International Iron & Steel Symposium
UDCS
S. Osman YILMAZ
Tanju TEKER
Friction welding is one of the most economical
and highly productive methods in joining similar and dissimilar
metals. It is widely used in the automotive and
aerospace industrial applications. In the present study, the
continuous drive rotary friction welding was conducted on
AISI1040 and high chromium white cast iron rods under
different rotational speeds (1600, 1700 and 2000 rpm).
Microstructural studies were carried out by Optical
Microscopy (OM), Energy Dispersive Spectrometry (EDS).
The microhardness variation across the joint zone was
determined. The characteristics such as hardness and
microstructural changes showed by friction processed welds were
compared to base materials.
International Iron & Steel Symposium
UDCS
Tanju TEKER
Eyyüp Murat KARAKURT
Mustafa ÖZASLAN
In this study, high chromium white cast iron and
AISI1030 steel with nickel interlayer were combined by
friction welding method, using different friction times (8, 10
and 12 s). Welding morphologies were analyzed by optical
microscopy (OM), energy dispersive spectrometry (EDS) and
microhardness analysis. Accordingly, as indicated in the
literature, weld joints were divided into four zones as
extremely deformed zone, deformed zone, partially deformed
zone and base metal. Consequently, depending on increasing
friction time, atom transitions occurred in the weld zones.
Moreover, the highest microhardness values were obtained in
the weld joint with 10 s.
International Iron & Steel Symposium
UDCS
Tanju TEKER
Eyyüp Murat KARAKURT
FeTi and FeB particulates having 150 µm were
inoculated to molten 27Cr high chromium white cast iron as 0.5 wt.%
and over 50 °C above the melting temperature. Samples were
analyzed using optical microscopy and XRD to examine the
influence of the addition of titanium and boron. The effect of
inoculant on the size and carbide volume fraction were determined.
The microstructures of the samples were examined by matrixstructure of austenitic and M7C3 carbides with austenite layer
surrounding the carbides. From the heat treatment results, it can be
say that the size of the austenite reduced, and the decomposition of
the austenite resolved M7C3 carbides.
International Iron & Steel Symposium
UDCS
S. Osman YILMAZ
Tanju TEKER
In this study; Fe-1Nb and Fe-10Nb (at.%) binary alloys
were boronized at 950 °C for 3 hours. Effect on the formation of
boride layer of increasing amount of niobium in pure iron was
experimentally investigated. Microstructural changes occurring
on the surfaces of the samples after boronizing process were
examined by optical microscope (OM), and microhardness and
boride layer thickness were measured separately for each sample.
Typical sawtooth morphologies were observed on the surface
coatings. As a result, hardnesses of boron layers obtained from the
surface of the samples were much higher than base metal. In
addition, it was found that boride layer thickness was decreased
with increasing niobium content in pure iron.
International Iron & Steel Symposium
UDCS
Tanju TEKER
Osman YILMAZ
Eyyüp Murat KARAKURT
In this study, Hardox 450 reinforced and FeW based
metal matrix composites (MMC) were combined on AISI 1020
steel substrate by using plasma transferred arc welding (PTAW)
process. The new created coated surfaces were examined by using
optic microscopy (OM), energy dispersive spectrometry (EDS)
and microhardness tests. The microstructure studies of the
superficial layers of the coating revealed presence of a mixture of
the dendritic phase structure of ferrit (α). The results show that;
the change of hardness and the size of dendrites formed on the
coated surfaces changed by the variation of the processing
parameters. Hardox 450 + 10 wt.%FeW composite coating was
the most appropriate combination in terms of hardness
performance.
International Iron & Steel Symposium
UDCS
Tanju TEKER
Eyyüp Murat KARAKURT