Three-body abrasive wear of fine pearlite, nanostructured bainite and martensite

Wear maps for TiC composite based coatings deposited on 303 stainless steel

Wear behaviour of nanocrystallised Hadfield steel

Annealed AISI 1080 steel bars were subjected to cyclic heat treatment for different number of cycles, viz. 1-cycle, 2-cycle and 3-cycle. Each cycle consisted of inserting the specimen in an electric resistance furnace at a temperature of 775 °C (in fully austenitic region) and holding for a short duration (6 min), followed by oil quenching to the room temperature. Besides, tempering treatment (at 300 °C for 1 h) was also provided after 3 cycles of heat treatment. Such a typical thermal cycling resulted in the evolution of a novel microstructure that comprised of microscopic clusters and submicroscopic spheroids of cementite in a matrix of martensite after 3 cycles of heat treatment. Accordingly, much higher hardness (845 HV), strength (UTS=1609 MPa) and equivalent ductility (% Elongation=8) were achieved with 3 cycles of heat treatment as compared to conventional hardened and tempered AISI 1080 steel (Hardness=616 HV, UTS= 1206 MPa, % Elongation=9). Execution of tempering after 3 cycles of heat treatment resulted in reasonable strength (UTS=1256 MPa) with higher ductility (% Elongation=13).

Structure–property correlation of AISI 1080 steel subjected to cyclic quenching treatment

Dry sliding wear behavior of 6351 Al alloy and its composites with single (Al2O3) and hybrid (Al2O3 + SiC) reinforcements was investigated at low sliding speed (1 m s−1) against a hardened EN 31 disk at different loads. In general, the wear mechanism involved adhesion and microcutting abrasion at lower load. At higher load, abrasive wear involving microcutting and microplowing along with oxide formation was observed. The 6351 Al–4 vol% Al2O3 composite exhibited superior wear resistance than 6351 Al alloy at all loads. This was attributed to the presence of massive Al2O3 particle clusters (that resisted the abrasive wear) and the formation of adherent massive tribo-oxide under higher frictional heat and associated temperature rise at higher load. The existing Al2O3 particles in a cluster acted as active nucleation sites for oxidation. At lower loads (viz. 19.6 and 29.4 N), 6351 Al–(2 vol% SiC + 2 vol% Al2O3) hybrid composite exhibited the best wear resistance due to the presence of massive (SiC + Al2O3) particle clusters resisting abrasive wear. However, at higher loads (39.2 and 63.8 N), the breakdown of (SiC + Al2O3) particle clusters resulted in a wear resistance of hybrid composite equivalent to (at 39.2 N) or much inferior to (at 63.8 N) that of 6351 Al alloy.

Dry Sliding Wear Behavior of Aluminum-Based Metal Matrix Composites with Single (Al 2 O 3 ) and Hybrid (Al 2 O 3 + SiC) Reinforcements

Dry sliding wear behaviour of medium carbon steel against an alumina disk

In this research work the early fatigue damage characteristics up to 50% of life has been investigated at near-endurance stress amplitude in a medium carbon steel with hardened & tempered and normalized conditions by application of post fatigue tensile loading. During fatigue loading microvoids were generated at the interphase-interface through vacancy clustering. Directional localized coalescence of these microvoids generated ‘void sheets’ in the normalized steel and ‘craters’ in the hardened & tempered steel. These defects acted as the potential sites for failure during post fatigue tensile loading deteriorating the mechanical properties. This was, therefore, clearly indicated that when a high tensile load is superimposed on near-endurance fatigue loading, material may fail much earlier than its actual fatigue life. The normalized steel suffered from more reduction in ductility than the hardened & tempered steel indicating more susceptibility to fatigue damage.

The Effect of Post Fatigue Tensile Loading on Mechanical Properties and Failure Behaviour of Steel

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Dry sliding wear behaviour of medium carbon steel against an alumina disk

The Effect of Post Fatigue Tensile Loading on Mechanical Properties and Failure Behaviour of Steel