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Author(s): S.-I. Nishida, N. Hattori, Y. Nakabaru & A. Tsuchiyama
Abstract:
As is generally known, Titanium alloy has excellent properties for its
lightweight, high strength ratio, high anti-corrosive resistance etc.
On the other
hand, as Ti alloy is not so good at wear resistance, there occasionally appear
some problems at the contact area with the other metals.
Therefore, surface
treatment of Ti alloy would be one good solution for the above problems.
Diamond-like carbon (DLC) would be one of the most practical methods for
compensating the defect of Ti alloy’s properties due to its high hardness,
electrical insulation, resistance to chemical attacks, superior smooth surface,
excellent wear resistance etc.
Rotating bending fatigue tests had been performed
in order to investigate the effect of DLC coating on the fatigue properties of
Ti-6Al-4V alloy.
The DLC films have been deposited on Ti alloy specimens
using an ionization deposition method.
Four kinds of specimens coated for
different coating times were prepared for the fatigue test.
The result obtained in
this test shows that the fatigue limit and internal hardness improved as the
coating time becomes longer and the fatigue limit was improved by 100MPa as
compared to the specimen without surface treatment.
It is considered that this
result would be due to compressive residual stress generated in the specimen’s
surface during the process of the DLC coating.
Keywords:
Ti alloy, fatigue strength, DLC film, hardness, fatigue crack
initiation and propagation.
...
Pages: 9
Size: 2,297 kb
Paper DOI: 10.2495/SECM070011
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