Evaluation of surface Roughness and hardness of PVD coated AISI D2 Steel by taguchi analysis
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Keywords:
Physical Vapor Deposition, Die D2 Steel, Titanium Nitride, Taguchi Analysis, Coating Parameters, Hardness, Surface RoughnessAbstract
The enhancement of AISI D2 tool steel's surface properties through the application of
Titanium Nitride (TiN) coating using the Physical Vapor Deposition (PVD) process. AISI D2 steel,
widely used in the die and tool manufacturing industries, is known for its exceptional wear resistance and
high hardenability. However, to further improve its hardness and reduce surface roughness, PVD TiN
coating was applied. The study utilized Taguchi analysis to systematically investigate the effects of key
process parameters—temperature, pressure, and time—on the hardness and surface roughness of the
coated material. Rectangular AISI D2 steel plates were ground and polished before coating, with variable
levels of temperature (275°C, 280°C, 285°C), pressure (0.0001 Pa, 0.001 Pa, 0.01 Pa), and time (6 min, 8
min, 10 min) used during the coating process. The results indicated that temperature had the most
significant effect on both hardness and surface roughness, followed by time and pressure. The optimal
conditions for achieving maximum hardness (174 HV) and minimum surface roughness (2.177 μm) were
found at a temperature of 285°C, pressure of 0.001 Pa, and coating time of 10 minutes. Regression
analysis and ANOVA confirmed the substantial influence of temperature and time on coating quality,
with pressure playing a comparatively minor role. The findings demonstrate the critical importance of
precise control over PVD parameters to optimize the performance of coated AISI D2 steel, providing
valuable insights for industrial applications where enhanced tool performance and longevity are essential.
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