EFFECT OF LAMINARIZATION TEMPERATURE ON MECHANICAL PROPERTIES AND MICROSTRUCTURAL EVOLUTION OF MARTENSITIC MEDIUM CARBON STEEL DEVELOPED VIA THERMAL CYCLING TREATMENT

https://doi.org/10.70382/mejaaer.v6i5.007

Authors

  • OLOGUNYE, O. B. Department of Mechanical Engineering Technology, Federal Polytechnic, Ede, Osun State, Nigeria.
  • OSUNSEYI, T. O. Department of Mechanical Engineering Technology, Federal Polytechnic, Ede, Osun State, Nigeria.
  • HADI, I. Department of Mechanical Engineering Technology, Federal Polytechnic, Ede, Osun State, Nigeria.
  • AKINOLA O . J. Department of Mechanical Engineering Technology, Federal Polytechnic, Ede, Osun State, Nigeria.

Abstract

The mechanical attributes of martensitic medium carbon steel can be enhanced by cyclic quenching and tempering (CQT) heat-treatment methods, since they promote the development of small grain structure. This study intends to investigate the effect of laminarization temperatures on mechanical properties and microstructural evolution of martensitic steel developed via thermal cycling treatment for improving the quality of steel. Initial normalization was performed at 845°C in a muffle furnace on hot-rolled AISI 1040 ribbed steel bars with a 12 mm diameter and contents of 0.40% C, 0.28% Si, and 0.62% Mn. The samples were tempered at 450°C after undergoing thermal cycling in the dual-phase region at 743°C, 761°C, and 779°C, respectively. Optical microscopy (OM) was used to evaluate and characterize the mechanical qualities of the steel developed. The findings demonstrate that the maximum tensile strength, yield strength, percent elongation, and elastic modulus all rose with an increase in laminarization temperature at 779℃ while the impact strength declined. The Optical micrographs revealed that the sample contains lath martensite and ferrite and carbide with fine grains after tempered at 450℃. These results suggest that thermal cycling treatment is a useful technique for improving the mechanical properties of high-performance martensitic steel to be used in load-bearing applications.

Keywords:

Laminarization, Temperature, Martensitic, Mechanical, Thermal

Published

2024-10-31

How to Cite

OLOGUNYE, O. B., OSUNSEYI, T. O., HADI, I., & AKINOLA O . J. (2024). EFFECT OF LAMINARIZATION TEMPERATURE ON MECHANICAL PROPERTIES AND MICROSTRUCTURAL EVOLUTION OF MARTENSITIC MEDIUM CARBON STEEL DEVELOPED VIA THERMAL CYCLING TREATMENT. International Journal of Applied and Advanced Engineering Research, 6(5). https://doi.org/10.70382/mejaaer.v6i5.007