Aluminum and Aluminum Nitrides Effect on Nucleation Sites in Micro-alloyed Steel

Chemical Effects of Aluminum

Authors

  • Shahid Hussain Abro Department of Materials Engineering, NED University of Engineering & Technology, Pakistan
  • Alidad chandio Department of Materials Engineering, NED University of Engineering & Technology, Pakistan
  • Muhammad Ali Siddiqui Institute of Metal Research, Chinese Academy of Sciences, China
  • Iftikhar A. Channa Department of Materials Engineering, University of Erlangen-Nuremberg, Germany

Keywords:

Aluminum, AlN (Aluminum nitride) particles, Lead bath, Nucleation, Austenite formation

Abstract

In the present research work an investigation has been taken to understand the effect of aluminum addition on nucleation sites of AlN particles. Two steel samples have been taken with and without aluminum addition. Steel A has no aluminum and steel B has some aluminum added. These samples have been solution heat treated first at 1200°C to dissolve the particles if already present in the steel matrix, and then these samples were heat treated at 710°C, 740°C, 770°C and 800°C respectively with a holding time of 10 to 60 seconds and were then quenched. These samples were then grinded and polished using metallography steps and revealed the microstructure after etching in two solutions Nital and Picric acid simultaneously. After initial interrogation by using the optical micrographs the SEM was utilized to further disclosed the nucleation morphologies. It was found that the 740°C with holding time of 15sec is the most critical stage to observe the nucleation sites. After having the SEM, it was concluded that for steel A, has the most preferable nucleation sites are ferrite and pearlite regions and surprisingly in steel B having aluminum addition the nucleation sites were interface of pro-eutectoid ferrite and pearlite. Optical, SEM and TEM characterization techniques were utilized to study the behavior and morphology.

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Published

2021-03-19

How to Cite

Abro, S. H. ., chandio, A. ., Siddiqui, M. A. ., & Channa, I. A. . (2021). Aluminum and Aluminum Nitrides Effect on Nucleation Sites in Micro-alloyed Steel: Chemical Effects of Aluminum. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, 56(3), 17–26. Retrieved from http://ppaspk.org/index.php/PPAS-A/article/view/84

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