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Study of Microstructure and Mechanical Properties of Hot-Rolled Ultra-High Strength Ferrite-Bainite Dual Phase Steel

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Abstract:

Effects of thermo-mechanical control processing (TMCP) on microstructure and mechanical properties of hot-rolled ultra-high strength ferrite-bainite dual phase steel were investigated on a laboratory hot rolling mill. The results have shown that the microstructure containing ferrite and bainite can be obtained by TMCP. Ultimate tensile strength of all the specimens exceeded 1000MPa. Finish rolling temperatures affect the mechanical properties of ultra-high strength ferrite-bainite dual phase steel. Ultimate tensile strength reached 1078MPa at relatively low finish rolling temperature because of the ferrite grains refined. Fast cooling after low temperature rolling results in the ferrite grains refined and the formation of martensite islands. As a result, the product of ultimate tensile strength and total elongation (Rm×A50) of specimen 4 with fast cooling after low temperature rolling reaches the maximum value (18096MPa%).

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Periodical:

Materials Science Forum (Volume 921)

Pages:

208-213

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.921.208

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Online since:

May 2018

Authors:

Zhuang Li*, Wei Lv

Keywords:

Fast Cooling, Finish Rolling Temperature, Low Temperature Rolling, Ultra-High Strength Ferrite-Bainite Dual Phase Steel

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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