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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