Abstract
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 (6min), followed by oil quenching to the room temperature. Besides, tempering treatment (at 300°C for 1h) 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 (845HV), strength (UTS=1609MPa) and equivalent ductility (% Elongation=8) were achieved with 3 cycles of heat treatment as compared to conventional hardened and tempered AISI 1080 steel (Hardness=616HV, UTS= 1206MPa, % Elongation=9). Execution of tempering after 3 cycles of heat treatment resulted in reasonable strength (UTS=1256MPa) with higher ductility (% Elongation=13).
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