Abstract:
Rotary blade wear is a problem that reduces the efficiency of the tiller. The
development of efficient tillage blades with long service life is needed to be investigated
and corrected. The purpose of this research was to investigate the influence of carbon
steel and types of coatings affecting the wear behavior of cutting edge of rotary blades.
The materials in the experiment had three types of carbon steel comprising
SS400, S45C and SK5, with a thickness of 7 millimeters. They were heat treated before
coated with a physical vapor deposition (PVD) method with 2 types of coatings
comprising titanium nitride (TiN) and chromium nitride (CrN). The thickness of the coating
is about 2-3 micrometers. Then the specimens were tested for mechanical properties by
three methods: a tensile strength method, hardness test and a scratch test.
The experimental showed that after heat treatment under specified conditions,
S45C has the highest tensile strength of 1149.27 N/mm2, which is higher than SS400
(375.96 N/mm2) and SK5 (1087.66 N/mm2) when the material is coated. According to the
physical vapor method with TiN and CrN coatings, it was found that S45C material has
the highest hardness. when coated with TiN coating equal to 2722.79 HV and CrN coating
was 1995.85 HV. When testing the scratch resistance of all 3 materials and 2 coatings, it
was found that the conformal abrasion was characterized by cracks from scratching,
which demonstrates consistent adhesion of both coatings. TiN-coated S45C carbon steel
is the most suitable in producing the rotary blade.
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