Effect of Aluminum Content on the Microstructure of Hypereutectoid Steels
- Effect of Aluminum Content on the Microstructure of Hypereutectoid Steels
- 장윤수; Phaniraj Madakashira; 김동익; 심재혁; 허무영
- Steel; Hypereutectoid; Pearlite; Aluminum; interlamellar spacing; grain boundary cementite; grain boundary ferrite; dilatometry
- Issue Date
- International Conference on Advanced Steels 2010
- , FR19
- Hypereutectoid (1.15%C) steels with 0, 0.34, 0.9, 1.31, 1.47 and 1.68 wt. % aluminum were
prepared. The samples were hot rolled at 1100°C followed by cooling in air. The microstructure of the
as-rolled samples was characterized using field emission-scanning electron microscopy (FE-SEM).
The electron back scattered diffraction (EBSD) technique was used to identify the grain boundary
phases. The grain boundary phase is cementite in steels with aluminum content up to 1.31%Al. Phase
diagram calculations show that aluminum increases the eutectoid temperature. The interlamellar
spacing and pearlite colony size decrease with increase in aluminum content. Dilatometry
measurements show that the transformation to pearlite occurs at a lower temperature in aluminum
alloyed steels. The refinement of pearlite microstructure is discussed in the context of dilatometry
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