Dr. Manoj D. Joshi

Nanomechanical response within the treated layer of SMATed AISI 316L Steel:

The surface layer of AISI 316L steel attrition-treated using 6 mm diameter balls was investigated using nano-indentation. A highly dense network of the deformation bands is observed near the attrition-treated surface. The formation of ~43% deformation-induced martensite (DIM) in the surface layer and ~38% improvement in the surface hardness are observed for after SMAT. Nanomechanical properties in the severely deformed surface layer change with an increase in distance from the surface due to the change in microstructure. The strain-rate sensitivity (SRS) and activation volume are increased with an increasing distance from the treated surface.

Tribological Response of Mechanical Attrition Treated Surface of AISI 316L Steel:

The tribological-response of severely deformed surface of AISI 316L steel was investigated using a ball-on-disk tribometer under dry and lubricated (using engine-oil) conditions using different loads and sliding velocities. SMAT improve the surface-hardness of steel by 56 %. Steel surface collided with higher velocity balls (3 m/s) shows the maximum reduction in wear rate, which is about 44 % and 88 % under dry and lubricated conditions, respectively.

Reciprocating Wear Behavior of Non-coated and Polymer/Composite Coated AISI 316L Steel: This topic investigate the reciprocating wear behaviour of surface mechanical attrition treated (SMAT) AISI 316L stainless steel with and without polymer and composite coatings. The high performance aromatic thermoset polymer (ATSP) and its composite with MoS2 were deposited on non-SMATed and SMATed steel by using spin coating technique. Further, reciprocating wear test was performed on non-SMATed, SMATed, and coated surface against alumina ball using various loads and reciprocation cycles.

Exfoliated Nano-hBN Additives for Enhancing Tribological Performance of ATSP Coatings:

The role of hexagonal boron nitride (hBN) content (1, 5, and 10 wt.%), the extent of exfoliation (magnetic stirring for 1, 5 and 12 h duration) and substrate conditions (with/without surface mechanical attrition treatment (SMAT)) on tribological performance (under dry sliding condition) of aromatic thermoset polymer (ATSP) coatings deposited on AISI 316L stainless steel using Mayers’ bar technique were investigated here. The minimum COF of ~0.018 and volume loss of ~0.0095 mm3 are achieved when this composite coating is deposited on the SMATed substrate.

Tribological and Corrosion Performance of AlCrN and AlCrN/DLC Coated Austenitic Stainless-Steel:

This work investigates the tribological and corrosion performance of AlCrN and duplex AlCrN/DLC coatings deposited on AISI 316L austenitic steel, where the role surface mechanical attrition treatment (SMAT) is explored. Under the reciprocating wear situation, COF lower than 0.01 (under 20 N load) is obtained by depositing AlCrN/DLC duplex-coating on SMATed substrate. The AlCrN/DLC deposited SMATed steel has the best corrosion resistance.

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