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| Effect of isothermal time on microstructures and mechanical properties in hot rolled TRIP steels with low Si and more Al |
| WANG Xiao-hui， KANG Jian， LI Zhen-lei， LI Yun-jie， YUAN Guo， WANG Guo-dong |
| （State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， Liaoning， China） |
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Abstract In order to achieve the industrial application of hot rolled TRIP steels with low Si and more Al，hot rolled TRIP steels with low Si and more Al were set as studied object using scanning electron microscopy，transmission electron microscopy，tensile test and X-ray diffraction to study the effect of different isothermal time on microstructures and mechanical properties of experimental steels. The results show that the microstructures of experimental steels consist of polygonal ferrite，bainite ferrite and retained austenite. With isothermal time increasing，the volume percent of laminar bainite increases，while the volume percent of granular bainite decreases. When isothermal time is 20 min，the comprehensive mechanical properties of experimental steels reach the best，and the tensile strength，the total elongation and the strength ductility balance is 732.25 MPa，36% and 26.36 GPa·%，respectively. The volume percent and carbon concentration of retained austenite initially increases and then decreases，and the experimental steels exhibit excellent work hardening behaviour with isothermal time 20 min.
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Received: 25 September 2018
Published: 09 May 2019
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2019, Vol. 54 
