AustemperingTime and Its Influence on the Mechanical Performance of Inverse Bainite: Insights from Hardness, Toughness, and Strength Testing
Journal Title: International Journal of Innovations in Science and Technology - Year 2024, Vol 6, Issue 4
Abstract
This study examines the impact of austempering time on the mechanical properties of 0.8C experimental steel with inverse bainitic microstructures. Samples were austenitized at 900 °C and austempered at 420 °C for 30, 60, 90, and 120 minutes. The effects on hardness, impact toughness, and (UTS) were analyzed. Microstructural evaluations by optical microscope, scanning electron microscope, and energy dispersive spectroscopy confirmed the formation of inverse bainite. Mechanical testing showed that increasing austempering time leads to higher hardness due to cementite lath growth and reduced ferrite content, but also results in lower Charpy impact energy, indicating reduced toughness. While UTS initially decreases, it increases sharply after 120 minutes, accompanied by brittle fracture. This study suggests that prolonged austempering enhances hardness and strength but increases brittleness, making these structures less suitable for applications involving sudden forces.
Authors and Affiliations
Aqil Inam, Waqas Dilawar, Muhammad Haseeb Hassan, Faraz Hussain, Inam Ullah, Muhammad Ishtiaq
Keywords
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