Effect of Cooling Rate on Microstructure and Mechanical Properties of Eutectoid Steel Under Cyclic Heat Treatment
| Autor: | Soma Maji, Amir Raza Subhani, Bijay Kumar Show, Joydeep Maity |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Quenching Materials science Cementite Mechanical Engineering Metallurgy 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences chemistry.chemical_compound Cooling rate chemistry Mechanics of Materials 0103 physical sciences General Materials Science Lamellar structure Pearlite 0210 nano-technology Ductility Eutectic system |
| Zdroj: | Journal of Materials Engineering and Performance. 26:3058-3070 |
| ISSN: | 1544-1024 1059-9495 |
| Popis: | A systematic study has been carried out to ascertain the effect of cooling rate on structure and mechanical properties of eutectoid steel subjected to a novel incomplete austenitization-based cyclic heat treatment process up to 4 cycles. Each cycle consists of a short-duration holding (6 min) at 775 °C (above A1) followed by cooling at different rates (furnace cooling, forced air cooling and ice-brine quenching). Microstructure and properties are found to be strongly dependent on cooling rate. In pearlitic transformation regime, lamellar disintegration completes in 61 h and 48 min for cyclic furnace cooling. This leads to a spheroidized structure possessing a lower hardness and strength than that obtained in as-received annealed condition. On contrary, lamellar disintegration does not occur for cyclic forced air cooling with high air flow rate (78 m3 h−1). Rather, a novel microstructure consisting of submicroscopic cementite particles in a ‘interweaved pearlite’ matrix is developed after 4 cycles. This provides an enhancement in hardness (395 HV), yield strength (473 MPa) and UTS (830 MPa) along with retention of a reasonable ductility (%Elongation = 19) as compared to as-received annealed condition (hardness = 222 HV, YS = 358 MPa, UTS = 740 MPa, %Elongation = 21). |
| Databáze: | OpenAIRE |
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