Dynamic Recrystallization Behavior of Twin Roll Cast Low Carbon Steel Strip

Gao, Haiyan; Xie, Zhixiong; Yang, Yu; Yuan, Fang; Wang, Jun; Sun, Baode

doi:10.2355/isijinternational.49.546

Cited by 14 publications

(7 citation statements)

References 22 publications

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“…This can be supported by a result published in Ref. [31], which stated that completion of the dynamic recrystallisation had required a strain of 0.99 when the PAGS was 120 μm and the sample (0.05 C, 0.28 Si, 0.54 Mn, 0.01 P, 0.005 S and balance Fe, all in wt. % ) was deformed at 1100 °C at a strain rate of 1 s -1 .…”

Section: Microstructure Evolution During Thermo-mechanical Processingsupporting

confidence: 76%

“…The dip tester was designed to simulate the initial contact conditions of a twin roll caster used in strip casting technology [25,30]. The copper substrates spot welded with R-type thermocouple were used as contact surfaces between liquid metals and twin rollers, which was immersed into the molten metal for a certain time in order to achieve different high cooling rates of up to ~ 1700 Ks -1 [25,31] characteristic for the strip casting process. Then the copper substrates were removed from the furnace and the solidified samples were then used in this study.…”

Section: Experimental Detailmentioning

confidence: 99%

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Microstructure and mechanical properties of strip cast TRIP steel subjected to thermo-mechanical simulation

Xiong

Kostryzhev

Liang

et al. 2016

Materials Science and Engineering: A

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Instead of hot rolling and cold rolling followed by annealing, strip casting is a more economic and environmentally friendly way to produce transformation-induced plasticity (TRIP) steels. According to industrial practice of strip casting, rapid cooling in this work was achieved using a dip tester, and a Gleeble 3500 thermo-mechanical simulator was used to carry out the processing route. A typical microstructure of TRIP steels, which included ~0.55 fraction of polygonal ferrite with bainite, retained austenite and martensite, was obtained. The effects of deformation (0.41 reduction) above non-recrystallisation temperature, isothermal bainite transformation temperature and the size of second phase region on microstructure and mechanical properties were studied. The steel isothermally transformed at 400 °C had the best combination of ultimate tensile strength (UTS) and total elongation (TE), whether deformation was applied or not. The deformation resulted in the improvement of mechanical properties after holding at 400 °C: the UTS increased from 590 to 696 MPa and TE decreased from 0.27 only to 0.26. It was predominantly ascribed to grain size refinement and dislocation strengthening. The studied TRIP steel had comparable mechanical properties with TRIP 690 produced commercially. Abstract: Instead of hot rolling and cold rolling followed by annealing, strip casting is a more economic and environmentally friendly way to produce transformation-induced plasticity (TRIP) steels. According to industrial practice of strip casting, rapid cooling in this work was achieved using a dip tester, and a Gleeble 3500 thermo-mechanical simulator was used to carry out the processing route. A typical microstructure of TRIP steels, which included ~ 0.55 fraction of polygonal ferrite with bainite, retained austenite and martensite, was obtained. The effects of deformation (0.41 reduction) above non-recrystallisation temperature, isothermal bainite transformation temperature and the size of second phase region on microstructure and mechanical properties were studied. The steel isothermally transformed at 400 °C had the best combination of ultimate tensile strength (UTS) and total elongation (TE), whether deformation was applied or not. The deformation resulted in the improvement of mechanical properties after holding at 400 °C: the UTS increased from 590 to 696 MPa and TE decreased from 0.27 only to 0.26. It was predominantly ascribed to grain size refinement and dislocation strengthening. The studied TRIP steel had comparable mechanical properties with TRIP 690 produced commercially.

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Section: Microstructure Evolution During Thermo-mechanical Processingsupporting

confidence: 76%

Section: Experimental Detailmentioning

confidence: 99%

Microstructure and mechanical properties of strip cast TRIP steel subjected to thermo-mechanical simulation

Xiong

Kostryzhev

Liang

et al. 2016

Materials Science and Engineering: A

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“…The as-cast strip with the same thickness and width as that of the hot-rolled sheet can be manufactured directly from the molten steel without continuous casting and hot rolling [4][5][6]. This advanced and energy-efficient technology has attracted significant attention and different strip-cast steels such as low carbon steel [7][8][9][10], stainless steel [11][12][13][14][15][16] and silicon steel [17][18][19][20][21][22][23][24][25] have been studied. The previous studies [11][12][13][14][15][16][17][18][19][20][21][22][23] indicated that the strip casting had texture advantage in manufacturing stainless steel and nonoriented silicon steel, resulting in excellent formability and magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing after strip casting on texture development in grain oriented silicon steel produced by twin roll casting

Wang

Zhang

et al. 2015

Materials Characterization

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“…As-cast specimens of 36 × 36 mm 2 and 1.2 mm thickness were produced using dip tester at Deakin University [25], which can simulate fast cooling during solidification between twin rolls in strip casting process [24,26]. The dip tester is used to immerse a copper substrate into molten steel for a short and controlled period of time and then immediately lift it out to simulate rapid solidification [27].…”

Section: Materials and Experimental Techniques 21 Processing Routementioning

confidence: 99%

Microstructures and mechanical properties of TRIP steel produced by strip casting simulated in the laboratory

Xiong

Kostryzhev

Saleh

et al. 2016

Materials Science and Engineering: A

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Conventional transformation induced plasticity (TRIP) steel (0.17C-1.52Si-1.61Mn-0.03Al, wt%) was produced via strip casting technology simulated in the laboratory. Effects of holding temperature, holding time and cooling rate on ferrite formation were studied via analysis of the continuous cooling transformation diagram obtained here. A typical microstructure for conventional TRIP steels consisting of ~ 0.55 fraction of polygonal ferrite with bainite, retained austenite and martensite was obtained. However, coarse prior austenite grain size of ~80 μm led to large polygonal ferrite grain size of ~17 μm, coarse second phase regions of ~21 μm size, small amount of retained austenite (0.02-0.045) and the presence of Widmanstätten ferrite. Optimisation of the microstructure-property relationship was reached via a variation in the isothermal bainite transformation temperature. The highest retained austenite fraction of 0.045±0.003 with medium carbon content of 1.23±0.01 wt% was obtained after holding at 400 °C, resulting in the highest ultimate tensile strength of 590±35 MPa and largest total elongation of 0.27±0.05. The presence of TRIP effect in the studied steel was revealed through the analysis of strain hardening exponent and modified Crussard-Jaoul model. Effect of processing parameters on retained austenite retention and stress-strain behaviour was discussed. Conventional transformation induced plasticity (TRIP) steel (0.17C-1.52Si-1.61Mn-0.03Al, wt. %) was produced via strip casting technology simulated in the laboratory. Effects of holding temperature, holding time and cooling rate on ferrite formation were studied via analysis of the continuous cooling transformation diagram obtained here. A typical microstructure for conventional TRIP steels consisting of ~ 0.55 fraction of polygonal ferrite with bainite, retained austenite and martensite was obtained. However, coarse prior austenite grain size of ~ 80 μm led to large polygonal ferrite grain size of ~ 17 μm, coarse second phase regions of ~ 21 μm size, small amount of retained austenite (0.02 -0.045) and the presence of Widmanstätten ferrite. Optimisation of the microstructure-property relationship was reached via a variation in the isothermal bainite transformation temperature. The highest retained austenite fraction of 0.045±0.003 with medium carbon content of 1.23±0.01 wt. % was obtained after holding at 400 °C, resulting in the highest ultimate tensile strength of 590±35 MPa and largest total elongation of 0.27±0.05. The presence of TRIP effect in the studied steel was revealed through the analysis of strain hardening exponent and modified Crussard -Jaoul model. Effect of processing parameters on retained austenite retention and stress-strain behaviour was discussed.

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Dynamic Recrystallization Behavior of Twin Roll Cast Low Carbon Steel Strip

Cited by 14 publications

References 22 publications

Microstructure and mechanical properties of strip cast TRIP steel subjected to thermo-mechanical simulation

Microstructure and mechanical properties of strip cast TRIP steel subjected to thermo-mechanical simulation

Effect of annealing after strip casting on texture development in grain oriented silicon steel produced by twin roll casting

Microstructures and mechanical properties of TRIP steel produced by strip casting simulated in the laboratory

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