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Effect of Tempering Temperature on Microstructure and Properties of E690 Offshore Plate Steel 被引量:14

Effect of Tempering Temperature on Microstructure and Properties of E690 Offshore Plate Steel
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摘要 A new kind of Mn Mo Nb Cu B bainite steel which satisfied mechanical demands of E690 offshore plate steel was designed. The effect of two processes thermomechanical control process (TMCP)+ tempering (T) and thermomechanical control process (TMCP) + reheating and quenching (RQ) + tempering (T) on microstructure and mechanical properties were studied by means of scan electron microscope (SEM), transmission electron micro- scope (TEM) and electron back scatter diffraction (EBSD). The results showed that optimal mechanical properties were available when tempering at 550 ℃ for both processes. The microstructure of the TMCP+T treated sample tempering in the range of 450 to 550 ℃ for 1 h did not change dramatically yet the lath in the TMCP+RQ+T trea- ted sample merged together and transformed into polygonal ferrite. At the same time, the sub-structure of grain bainite transformed from lath to cell shape to refine grains with tempering temperature mounting. Lots of sub-grain boundaries were located within bainite and adjacent bainite grain boundaries were high angle. A new kind of Mn Mo Nb Cu B bainite steel which satisfied mechanical demands of E690 offshore plate steel was designed. The effect of two processes thermomechanical control process (TMCP)+ tempering (T) and thermomechanical control process (TMCP) + reheating and quenching (RQ) + tempering (T) on microstructure and mechanical properties were studied by means of scan electron microscope (SEM), transmission electron micro- scope (TEM) and electron back scatter diffraction (EBSD). The results showed that optimal mechanical properties were available when tempering at 550 ℃ for both processes. The microstructure of the TMCP+T treated sample tempering in the range of 450 to 550 ℃ for 1 h did not change dramatically yet the lath in the TMCP+RQ+T trea- ted sample merged together and transformed into polygonal ferrite. At the same time, the sub-structure of grain bainite transformed from lath to cell shape to refine grains with tempering temperature mounting. Lots of sub-grain boundaries were located within bainite and adjacent bainite grain boundaries were high angle.
出处 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2012年第3期67-72,共6页
关键词 offshore plate low carbon bainitic steel TEMPERING TOUGHNESS EBSD offshore plate low carbon bainitic steel tempering toughness EBSD
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