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International Journal of Iron & Steel Society of Iran
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Sharifi, H., Salehi, M., Saeri, M. (2014). The Effect of Ferrite Grain Size on the Fatigue Behavior of Ferrite-martensite Dual-phase Steels. International Journal of Iron & Steel Society of Iran, 11(2), 11-16.
H. Sharifi; M. Salehi; M.R. Saeri. "The Effect of Ferrite Grain Size on the Fatigue Behavior of Ferrite-martensite Dual-phase Steels". International Journal of Iron & Steel Society of Iran, 11, 2, 2014, 11-16.
Sharifi, H., Salehi, M., Saeri, M. (2014). 'The Effect of Ferrite Grain Size on the Fatigue Behavior of Ferrite-martensite Dual-phase Steels', International Journal of Iron & Steel Society of Iran, 11(2), pp. 11-16.
Sharifi, H., Salehi, M., Saeri, M. The Effect of Ferrite Grain Size on the Fatigue Behavior of Ferrite-martensite Dual-phase Steels. International Journal of Iron & Steel Society of Iran, 2014; 11(2): 11-16.

The Effect of Ferrite Grain Size on the Fatigue Behavior of Ferrite-martensite Dual-phase Steels

Article 3, Volume 11, Issue 2, Winter and Spring 2014, Page 11-16  XML PDF (4.53 MB)
Document Type: Research Paper
Authors
H. Sharifi email 1; M. Salehi2; M.R. Saeri1
1Department of Materials Science, Faculty of Engineering, Shahrekord University, Shahrekord, Iran
2Department of Materials Engineering, Isfahan University of Technology, 84156-83111, Isfahan, Iran
Abstract
The effect of ferrite grain size on the fatigue and tensile properties of dual phase steels with a 0.25 volume fraction of martensite (Vm) under different heat treatments was investigated. The heat treatments were homogenized at 1200 oC along with several subsequent normalizations at 910 oC, resulting in different microstructures and mechanical properties. After heat treatment, the obtained steels, with different ferrite grain sizes, were heat treated to obtain a dual phase ferritic-martensitic microstructure. In order to process the dual phase steels, low carbon manganese steel was used. Fatigue tests were carried out at room temperature and the fracture surfaces of the fatigue specimens were studied by SEM. The data obtained by the fatigue tests indicated that the fatigue strength at 107 cycles had a linear increase with decreasing the grain size of ferrite, while higher applied stress had a little effect on the grain size and the fatigue strength. The fracture surface of the fatigue specimens showed two distinct regions, namely, the fatigue fracture and the final fracture. Striation lines were clearly seen in the region of the fatigue failure. Furthermore, for all microstructures, the final fracture was mainly brittle.
Keywords
Dual phase steels; fatigue; Ferrite-martensite, Grain size, Heat treatment
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