Effects of microstructure and crystallography on mechanical properties of cold-rolled SAE1078 pearlitic steel

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Liu, Y.
Yang, C. D.
Liu, M.
Wang, C. H.
Dai, Y. C.
Li, X.
Zhang, C. X.
Zhang, Z. H.
Cao, G. H.
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Russell, Alan
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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Materials Science and Engineering

The Department of Materials Science and Engineering teaches the composition, microstructure, and processing of materials as well as their properties, uses, and performance. These fields of research utilize technologies in metals, ceramics, polymers, composites, and electronic materials.

The Department of Materials Science and Engineering was formed in 1975 from the merger of the Department of Ceramics Engineering and the Department of Metallurgical Engineering.

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The evolution of the microstructure and crystallography in SAE1078 pearlitic steel sheets under different cold-rolling reductions of up to 90% were quantified using transmission electron microscopy (TEM), electron backscatter diffraction (EBSD), and X-ray diffraction (XRD). The mechanical properties were determined by tensile testing at room temperature. TEM analysis showed that the pearlite structure was obviously refined with the interlamellar spacing decreasing to about 57 nm at the rolling reduction of 90%. EBSD investigations indicated that the ferrite exhibited a {001}texture in the 90% cold-rolled pearlitic steel. The dislocations were mainly concentrated during cold rolling between the 10% and 70% reduction ratios as the average kernel average misorientation (KAM) angle increased from 0.75° to 1.20°. XRD examination revealed that a transformation from bcc to bct crystal structure of ferrite occurred at 90% rolling reduction due to the supersaturation of carbon. Significant augmentation in the ultimate tensile strength during cold rolling results from the boundary, dislocation, and solid solution strengthening mechanisms.


This is a manuscript of an article published as Liu, Y., C. D. Yang, M. Liu, C. H. Wang, Y. C. Dai, X. Li, A. M. Russell, C. X. Zhang, Z. H. Zhang, and G. H. Cao. "Effects of microstructure and crystallography on mechanical properties of cold-rolled SAE1078 pearlitic steel." Materials Science and Engineering: A 709 (2018): 115-124. DOI: 10.1016/j.msea.2017.10.050. Posted with permission.

Sun Jan 01 00:00:00 UTC 2017