Strain aging on the yield strength to tensile strength ratio of UOE pipe
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https://doi.org/10.1080/02670836.2017.1288776
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Strain aging of microalloyed steel pipe can occur at the relatively low temperatures associated with the pipe coating process and/or during long term storage. A Box-Behnken statistical design is used to determine the significant strain aging variables that affect the longitudinal yield strength to tensile strength (Y/TS) ratio for three uncoated X70 UOE pipes. The strain aging variables examined include time, temperature, steel composition/microstructure (vis-a-vis the C/Nb ratio) and position through the pipe wall thickness. Metallographic and EBSD examinations were undertaken to determine the grain size and phase percentages of the as-received pipe steel. Both position in the pipe and C/Nb ratio were found to have a statistically significant effect on the yield strength to tensile strength ratio.
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http://purl.org/coar/resource_type/c_6501 http://purl.org/coar/version/c_970fb48d4fbd8a85
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en