Effect of microstructure and crystallography on sulfide stress cracking in API-5CT-C110 casing steel
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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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Abstract
Microstructure and crystallography have been characterized on an API-5CT-C110 casing steel. Regions near a crack, more distant from a crack, and from specimen with no cracks were analyzed through electron backscatter diffraction (EBSD). A higher proportion of low-angle grain boundaries appeared in the regions near the crack, while regions distant from cracks presented primarily high-angle grain boundaries. The high Kernel Average Misorientation value and more grains with higher Taylor factor emerged in areas beside cracks. The corrosion reactions observed in the cracks would be expected to promote crack growth.
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This article is published as Liu, M., C. D. Yang, G. H. Cao, A. M. Russell, Y. H. Liu, X. M. Dong, and Z. H. Zhang. "Effect of microstructure and crystallography on sulfide stress cracking in API-5CT-C110 casing steel." Materials Science and Engineering: A 671 (2016): 244-253. DOI: 10.1016/j.msea.2016.06.034. Posted with permission.