Abstracts Book - IMRC 2018

• SE2-P001
INFLUENCE OF SUBSTRATE ROUGHNESS ON THE ADHESION AND
TRIBOLOGICAL PERFORMANCE OF TITANIUM NITRIDE COATING
ON AISI H13 STEEL
Ricardo Ortega 1 , María Teresa Hernández 1 , Benjamín Arroyo 1 , Luis Daniel Aguilera 1 , J. Santos
García 1 , Karla Judith Moreno Bello 1
1 Instituto Tecnológico de Celaya, Departamento de Ingeniería Mecánica, Mexico.
AISI H13 steel is widely used in the metal-mechanic industry for the manufacture
of forge tools principally. These tools are subjected to cyclic loads that cause the
material failure due to wear and fatigue. For that reason, ceramic coatings are
used as sacrificial materials, in this point, titanium nitride coating (TiN) is one of
most employed in this kind of applications. However, in the industry field, these
coatings are deposited by external suppliers who demand a specific surface
finish. Nevertheless, those values vary between suppliers because the impact
that the surface finish of the substrate has over the final properties of the coated
elements is not well known. The objective of this research was to investigate the
influence of substrate roughness on the adhesion and tribological performance
of thin TiN coatings obtained by physical vapor deposition. For that purpose,
substrates of AISI H13 steel with surface finishes of 0.06, 0.28 and 0.90 μm in Ra
were coated with TiN under the same coating conditions. The chemical
composition of the steel, as well as that of the TiN coating, was obtained using
EDS analysis. Adhesion tests were carried out following the procedure of BSI
1071-8 standard while hardness was evaluated by ASTM C 1327-03. On the other
hand, dry sliding friction tests were conducted with a pin-on-disc tribometer,
according to the ASTM G 99-05 standard. This study showed that the roughness
of the coating was directly proportional to the substrate roughness. Regarding
adhesion and hardness, the results were very similar, good adhesion and a
hardness value of 14.51 GPa for all the substrate roughnesses were achieved.
However, the lower values for the friction coefficient and wear behavior were
obtained by the sample with the lowest substrate roughness of 0.06 µm. In
addition, it was found that friction and wear increase when the substrate
roughness increases.
Keywords: H13 steel, TiN Coating, Wear
Presenting authors email: ricardo.ortega.a@hotmail.com