3 results listed
Hot work tool steels are generally used in plastic
forming processes of metals as extrusion dies and punches. Service
life of these parts are related to their surface defects and
dimension changes arising from exposure to high pressure and
wear at high temperatures during plastic forming. Therefore, it is
important to enhance the surface properties of these parts to
extend their lifespan and mitigate the consequences of surface
defects and wear damage. Simulating damages on the dies
occurring during their service period is critical to estimate their
lifetime.
A homemade impact-sliding wear testing machine was designed
and used for accelerated simulation for observing performance of
quenched and tempered hot work tool steels in laboratory. Impact
sliding wear tester can be used for simulating extrusion process to
evaluate wear performances of different kind of die materials used
for metallic component production.
In the scope of this study, two different kinds of hot work tool steel
A and B were quenched and tempered with the carbon equivalent
of 1.91 and 1.66 respectively. Structural features of hot work tool
steels were characterized by optical microscopy, scanning electron
microscopy, X-Ray diffractometer and hardness measurements.
Furthermore, sliding and impact sliding wear tests were
conducted at room temperature (RT) to evaluate their wear
performances. Wear tracks were examined by profilometer to
compare wear damages of the steels. Results of characterization
analyses showed that steel A with the carbon equivalent of 1.91
sample exhibited better resistance against impact sliding wear
compared to steel B with the carbon equivalent of 1.66.
International Iron & Steel Symposium
UDCS
Ezgi Akyıldız
Faiz Muhaffel
Mert Altay
Seçkin Özkurt
Erdem Atar
Huseyin Cimenoglu
In metal forming process, improving mechanical and
surface properties of tool steels has been significant issue, since the
productivity is mainly related with the service life of tools. In order
to enhance service life of tools, wear is the most challenging
problem to tackle due to its detrimental effects on surface and
dimensional characteristics of components especially produced by
hot forming process. In the present study, influence of nitriding on
the wear resistance of famous AISI H13 tool steel was investigated
by homemade impact-sliding wear tester to simulate forces which
affects tool steels during extrusion process. Structural
characterization of nitrided and bare samples via using X-ray
diffractometer, optical and scanning electron microscopes was
conducted along with hardness measurements. Wear tracks of
samples subjected to impact-sliding wear test at room and
elevated temperature were examined under scanning electron
microscope in order to determine their wear mechanism. 2-D
profilometer was also used to measure the wear loss.
Results of these examinations revealed that nitriding leads to
increment in impact-sliding wear resistance of H13 tool steels at
room and elevated temperature.
International Iron & Steel Symposium
UDCS
Belda Aydın
Birsen Baş
Mertcan Kaba
Mert Altay
Faiz Muhaffel
Utku İnan
Seçkin Özkurt
Erdem Atar
Huseyin Cimenoglu
Titanium based materials have wide range of applications at elevated temperatures including highly oxidizing
and corrosive service conditions. Even though natural oxide film of titanium is very stable at room temperature and
resistant to corrosion and oxidation, it is very brittle at temperatures higher than 650°C. Therefore, a protective layer at
the surface would provide increased lifetime and performance for titanium based materials [1, 2]. For this purpose various
methods including Al films sputtering, magnetron sputtering, pack cementation, pack aluminizing have been researched
so far. Amongst these methods, hot dip aluminizing is a promising method for coating titanium materials as it is a simple,
quick and inexpensive alternative with respect to the other methods [3,4].
International Symposium on Light Alloys and Composite Materials
UHAKS
Mert Altay
Yakup Yurekturk
Murat Baydogan