Tribological Behaviour Of AFNOR Grade Z6
NCT DV 25-15 Precipitation Hardening
Austenitic Stainless Steel With NiCr-B Coating In
High Temperature Liquid Sodium
Author(s)
H. Kumar, V. Ramakrishnan, S. K. Albert, C. Meikandamurthy,
S. Chandramouli, V. Rajan Babu, R. Vijayashree
& A. K. Bhaduri
Abstract
The sliding wear and friction behaviour between AFNOR Grade Z6 NCT DV
25-15 precipitation hardening austenitic stainless steel and NiCr-B hardface
coating was investigated in high purity liquid sodium at 823 K employing an
indigenously developed reciprocating-type tribometer. The specimens for testing
were in the form of pins and disc, with two pins in contact with both the surfaces
of a disc specimen. The pin and disc specimens were made from precipitation
hardened Z6 NCT DV 25-15 alloy and NiCr-B alloy deposited on 316L stainless
steel substrate using Plasma Transferred Arc (PTA) welding process
respectively. Testing was carried out at sliding speeds of 2 mm/s for a total
sliding distance of 200 m under contact stress of 10 and 20 MPa respectively.
The static friction coefficient (s) and dynamic friction coefficient (d) were
estimated from the maximum value of friction force at the start of the movement
and from the friction force measured during movement respectively. In both the
tests d was found to be significantly lower than s. Weight loss measured for
both the pins and disc at the end of the tests were negligible and this indicates
that wear is very low in both the tests carried out at contact stress of 10 and
Keywords
liquid sodium, reciprocating-type tribometer, friction coefficient, wear, pin-on-disc, optical profilometer
Related Book
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