Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

Xiong, Zhiping; Kostryzhev, AG; Stanford, Nicole; Pereloma, EV

doi:10.1016/j.matdes.2015.09.031

Cited by 70 publications

(43 citation statements)

References 53 publications

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“…Amongst IBT held samples, the strain hardening rate of T 400 sample decreased faster at lower strains but more slowly at higher strains than for other conditions. The TQ sample showed a strain hardening exponent behaviour similar to ferrite-martensite DP steel [6,22], which is a rapid increase to a maximum point of 0.193 and then a fast decrease (Fig. 19(c)).…”

Section: Ebsd and Apt Analysis Of The T 400 Samplementioning

confidence: 88%

“…19(d)). The TQ sample showed a typical strain hardening behaviour of ferrite-martensite DP steel [59]: stage 1 was related to work hardening of polygonal ferrite during deformation; stage 2 corresponded to co-deformation of polygonal ferrite and martensite, when the ferrite was work hardened enough; during stage 3 the deformation was restricted by the dislocation pile-up leading to dislocation immobilisation [22,59]. Thus, the strain hardening index m increased from stage 1 to stage 3.…”

Section: Correlation Of Mechanical Properties With Microstructurementioning

confidence: 99%

“…Thus, the yield stress (YS) was determined using 0.2 % offset. The TQ sample exhibited a typical behaviour of ferrite-martensite DP steel [6,22]: larger YS and ultimate tensile strength (UTS), and lower uniform elongation (UE) and total elongation (TE) compared to the samples held at bainite transformation temperature. Amongst samples held for bainite formation, the T 400 sample showed the largest UTS and TE, leading to the best combination of mechanical properties ( Table 2).…”

Section: Ebsd and Apt Analysis Of The T 400 Samplementioning

confidence: 99%

“…At present the strip casting is utilised for industrial manufacture of carbon steels, silicon steels and stainless steels, and also lead, aluminium and brass strips [20,21]. Besides, a conventional DP steel was produced using strip casting technology in the laboratory [22,23]. Due to the strips being directly manufactured from liquid metal, the strip casting technology eliminates many subsequent processing stages inherent for conventional processing routes, such as multi-pass rough rolling of continuously cast thick slab and finishing rolling in continuous rolling mills.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Ebsd and Apt Analysis Of The T 400 Samplementioning

confidence: 88%

Section: Correlation Of Mechanical Properties With Microstructurementioning

confidence: 99%

Section: Ebsd and Apt Analysis Of The T 400 Samplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…reported a trial to obtain twinninginduced plasticity (TWIP) steels using this technology in the laboratory [25]. The dual phase steels were obtained by the present authors via the simulation of strip casting [26,27]. For TRIP steels, researchers focus on further development of hot rolling and cold rolling followed by annealing.…”

Section: Introductionmentioning

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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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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Pseudobinary Phase Diagrams of Eutectic Reaction for Pt‐containing and Pt‐free 718Plus Alloys

et al. 2021

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The pseudobinary phase diagrams of Pt-containing and Pt-free 718Plus alloys are constructed to better understand how Pt affects the eutectic reaction. The phase transition temperature is obtained by differential scanning calorimetry (DSC). The compositions of γ phase, eutectic phase, and Laves phase are obtained by energy dispersive spectrometry (EDS). Nb is set as the independent variable in the phase diagram as Nb is the most susceptible to concentration of eutectic phase during solidification. The reliability of the pseudobinary phase diagrams is verified by the results reported. According to the diagrams, on one hand, Pt increases the concentration of Nb required for the (Laves þ γ) eutectic reaction by increasing lattice space. On the other hand, the increased concentration of Nb and the slow diffusion rates of Pt and Nb cause the decrease in the temperature of the eutectic reaction. As a result, the eutectic point in the pseudobinary phase diagram moves down and shift to the right. Herein, experimental data are provided for enriching the phase diagram of 718Plus alloy.

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Microstructures and mechanical properties of dual phase steel produced by laboratory simulated strip casting

Cited by 70 publications

References 53 publications

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

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

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

Pseudobinary Phase Diagrams of Eutectic Reaction for Pt‐containing and Pt‐free 718Plus Alloys

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