Microstructure Evolution and Mechanical Properties of HotRolled Dual Phase Steel with Stage Cooling Pattern

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Journal of Northeastern University ›› 2013, Vol. 34 ›› Issue (6): 810-814.DOI: -

• Materials & Metallurgy • Previous Articles Next Articles

Microstructure Evolution and Mechanical Properties of HotRolled Dual Phase Steel with Stage Cooling Pattern

LI Chengning， YUAN Guo， ZHOU Xiaoguang， WANG Guodong

The State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.

Received:2012-12-21 Revised:2012-12-21 Online:2013-06-15 Published:2013-12-31
Contact: LI Chengning
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Abstract

Abstract: The effects of deformation temperature， holding temperature and holding time on microstructure evolution and properties of NbTi microalloyed hotrolled dualphase steel were researched by the thermal simulation test. The results showed that the ferrite content rises and the martensite morphology evolutes from block to island with the decreased deformation temperature. While the holding temperature drops gradually from 740℃ to 580℃， the amount of ferrite transformation firstly increases and then decreases， and reaches the largest at 660℃. The relation curve between the amount of ferrite transformation and holding time presents “S” model. The hotrolled dual phase steel is obtained by using ultrafast cooling+air cooling+laminar cooling mode， and adjusting the finish rolling temperature and air cooling time. The tensile strength is ranging between 630 and 710MPa， and yield ratio is less than or equal to 061. The microstructure of the steel is the mixture of ferrite and martensite or ferrite， martensite and a small amount of bainite.

Key words: hotrolled dual phase steel, thermal simulation, ferrite transformation, microstructure and properties, ultrafast cooling

CLC Number:

TG1421

LI Chengning， YUAN Guo， ZHOU Xiaoguang， WANG Guodong. Microstructure Evolution and Mechanical Properties of HotRolled Dual Phase Steel with Stage Cooling Pattern[J]. Journal of Northeastern University, 2013, 34(6): 810-814.

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Microstructure Evolution and Mechanical Properties of HotRolled Dual Phase Steel with Stage Cooling Pattern

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