The effect of microstructure and processing variables on the yield to ultimate tensile strength ratio in a Nb–Ti and a Nb–Ti–Mo line pipe steel

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dc.contributor.author Tang, Zhenghua
dc.contributor.author Stumpf, Waldo E.
dc.date.accessioned 2009-07-20T11:40:38Z
dc.date.available 2009-07-20T11:40:38Z
dc.date.issued 2008
dc.description.abstract In a hot rolled Nb–Ti and a Nb–Ti–0.09%Mo micro-alloyed steel, the ratio of yield strength to tensile strength (YS/UTS) was found to be a function of the microstructure and cooling rate in those tests where no coiling simulation and no prior deformation. The coarse bainite or acicular ferrite, which was formed at high cooling rates, raised the YS/UTS ratio under these process conditions. With coiling simulation, the ratio was not sensitive to the cooling rate or the microstructure as coiling allows the recovery of dislocations, thereby decreasing the difference in dislocation density that had arisen between a low and a high cooling rate. Deformation with a 33% reduction below the nil-recrystallisation temperature (Tnr) prior to the transformation, led to a high YS/UTS ratio that ranged from 0.81 to 0.86. The prior deformation, therefore, had a stronger effect on the YS/UTS ratio than microstructural changes through cooling rate variations. en_US
dc.identifier.citation Tang, Z & Stumpf, W 2008, ‘The effect of microstructure and processing variables on the yield to ultimate tensile strength ratio in a Nb–Ti and a Nb–Ti–Mo line pipe steel, ‘ Materials Science and Engineering: A, vol. 490, no. 1-2, pp. 391-402. [http://www.sciencedirect.com/science/journal/09215093] en_US
dc.identifier.issn 0921-5093
dc.identifier.other 10.1016/j.msea.2008.01.060
dc.identifier.uri http://hdl.handle.net/2263/10821
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.rights Elsevier en_US
dc.subject Yield strength to ultimate tensile strength ratio en_US
dc.subject Acicular ferrite en_US
dc.subject Prior deformation en_US
dc.subject Cooling rate en_US
dc.subject Nb–Ti micro-alloyed steel en_US
dc.title The effect of microstructure and processing variables on the yield to ultimate tensile strength ratio in a Nb–Ti and a Nb–Ti–Mo line pipe steel en_US
dc.type Postprint Article en_US


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