Effect of Notch Position on Impact Toughness of Friction Stir Processed Low Carbon Steel

Year 2017, Issue: 207, 7 - 13, 03.04.2017

Dursun Murat Sekban Semih Mahmut Aktarer Zongyi Ma Gençağa Pürçek

Abstract

The effect of single-pass friction stir
processing (FSP) on the room temperature impact toughness of a low carbon steel
was investigated via Charpy impact test. A fine-grained (FG) microstructure was
achieved into the processed zone by large deformation and simultaneous dynamic
recrystallization during FSP. The average grain size decreased from 25 μm down
to 3.0 μm after FSP. Grain refinement by FSP increased the impact energies as a
result of refined grains separated mostly by high-angle of misorientation.
Toughness of steel before FSP was about 8.7 J, and it increased up to 11.2 J
after processing depending on the notch positions of the samples. The peak
impact toughness value of 11.2 J was achieved with the notch position located
at top of the surface of processed steel plate. 

Keywords

Impact toughness, low carbon steel, friction stir processin

References

• Aktarer, S.M., Sekban, D.M., Saray, O., Kucukomeroglu,T., Ma, Z.Y., Purcek, G. (2015) Materials Science and Engineering: A, 636 311-319.
• Joo, M.S., Suh, D.W., Bhadeshia, H.K.D.H. (2013) Isij Int, 53 1305-1314.
• Lienert, B.T.J., Stellwag, J.W.L., Grimmett, B.B., Warke, R.W. (2003) Welding Journal Research Supplement, 82 1-9.
• Ma, Z.Y. (2008) Metall Mater Trans A, 39A 642-658.
• Ma, Z.Y., Pilchak, A.L., Juhas, M.C., Williams, J.C. (2008) Scripta Mater, 58 361-366.
• Mishra, R.S., Ma, Z.Y. (2005) Materials Science and Engineering: R: Reports, 50 1-78.
• Prangnell, P.B., Heason, C.P. (2005) Acta Mater, 53 3179-3192.
• Ray, A., Paul, S.K., Jha, S. (1995) J Mater Eng Perform, 4 679-688.
• Santella, M.L., Engstrom, T., Storjohann, D., Pan, T.Y. (2005) Scripta Mater, 53 201-206.
• Saray, O., Purcek, G., Karaman, I., Maier, H.J. (2012) Metall Mater Trans A, 43A 4320-4330.
• Song, R., Ponge, D., Raabe, D. (2005) Acta Mater, 53 4881-4892.
• Su, J. Q., Nelson, T.W., Sterling, C.J. (2005) Scripta Mater, 52 135-140.
• Xue, P., Xiao, B.L., Wang, W.G., Zhang, Q., Wang, D., Wang, Q.Z., Ma, Z.Y. (2013) Mat Sci Eng a-Struct, 575 30-34.