Combining a novel cyclic pre-quenching and two-stage heat treatment in a low-alloyed TRIP-aided steel to significantly enhance mechanical properties through microstructural refinement

Huang, Jianguo; Tang, Zihan; Ding, Hua; Zhang, H.; Bi, Long; Misra, R.D.K.

doi:10.1016/j.msea.2019.138231

Cited by 25 publications

(6 citation statements)

References 34 publications

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“…true strain for 4Cu alloy. (C), Yield strength versus the product of σuts and uniform EL of 3Cu and 4Cu alloys, as compared with those of other high performance materials reported in literature (14,(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36). The Cu-doped steels and the UFG TWIP steels fabricated by flash annealing or repeatedly cold rolling and annealing have exceptionally high values of σuts × uniform EL, suggesting a superior combination of strength and ductility.…”

Section: Takedownmentioning

confidence: 91%

“…Thus, we compare yield strength versus the product of σuts and uniform EL (elongation, EL) of the Cu-alloyed steels in Fig. 1C, with those of other high-performance alloys reported in literature (14,(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36). The Cu-doped TWIP steels and the UFG TWIP steels fabricated by complicated processes, i.e., flash annealing (36) or repeated cold rolling and annealing (26), exhibit superb combination of high yield strength and exceptionally large values of σuts × uniform EL (i.e., 71 GPa % for 4Cu alloy),…”

Section: Takedownmentioning

confidence: 99%

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Facile route to bulk ultrafine-grain steels for high strength and ductility

Gao

Jiang

Huai-Ruo

et al. 2021

Nature

155

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Section: Takedownmentioning

confidence: 91%

Section: Takedownmentioning

confidence: 99%

Facile route to bulk ultrafine-grain steels for high strength and ductility

Gao

Jiang

Huai-Ruo

et al. 2021

Nature

155

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show abstract

“…Namely, the amount of filmy retained austenite in the Q-2BT sample is increased. Previous works [29,30] have reported that more film-like retained austenite can ensure more continuous TRIP (transformation induced plasticity) effect and enhances the ductility. Thus, the improved elongation of the Q-2BT sample can be attributed primarily to the refined microstructure and more filmy retained austenite.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and mechanical properties of a medium-carbon bainitic steel treated by quenching and two-step bainitic isothermal transformation below Ms

Zhang

2021

Ironmaking & Steelmaking

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A quenching and two-step bainitic isothermal transformation below Ms (Q-2BT) process was proposed for a medium-carbon steel. The evolution of microstructure and its correlation with mechanical properties were investigated and compared with the samples subjected to a quenching and one-step bainitic isothermal transformation below Ms (Q-1BT) process. Results showed that the Q-2BT sample has a finer martensite/bainite/retained austenite multiphase microstructure than the Q-1BT ones because of the formation of smaller bainite and the decomposition of large untransformed austenite blocks. Meanwhile, an optimal strength (1582 MPa), elongation (20.2%) and toughness (110 J) combination can be obtained after the Q-2BT process. The significantly improved impact toughness can be attributed to refined microstructure, increased filmy retained austenite as well as a high proportion of high-angle boundaries (70.7%). In addition, the Q-2BT sample exhibits a longer hardening plateau and a higher hardening exponent (0.084) because of the larger amount of retained austenite (11.3%) and more filmy austenite with high stability.

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“…Studies have found that the adjustment of the initial structures is expected to achieve the refinement of grain size and improve the volume fraction as well as stability of austenite to a certain extent in the final microstructure; thus, the final mechanical properties were impacted profoundly. [24,25] Generally, the positive correlation between the RA and the mechanical properties stems from the active TRIP effect of the RA. The TRIP effect usually depends on the volume fraction and the degree of stability of the RA, that is, it can increase the work hardening rate and delay the necking without reducing the strength and ductility.…”

Section: Introductionmentioning

confidence: 99%

Influence of Initial Structures on the Mechanical Properties in Cold‐Rolled Transformation‐Induced Plasticity Steel

Wang

et al. 2023

steel research int.

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A novel transformation‐induced plasticity steel is analyzed to study the effects of initial structures and the intercritical annealing temperatures on austenization behavior, strain distribution, and the characteristics of retained austenite (RA). The resulting microstructure and its relationship with mechanical properties are measured using dilatometry, scanning electron microscopy, electron backscatter diffraction, X‐ray diffraction, and tensile testing. The results show that the initial structure is composed of martensite (M) or tempered martensite (TM) and can significantly refine the final microstructure and its strain distribution is more homogeneous compared to the ferrite + perlite (F + P) initial structure samples. However, it is found that the larger size of the RA mainly distributes at the ferrite grain boundaries while the smaller size mainly distributes in the bainite matrix and outside martensite. Meanwhile, most of the RA in the bainite matrix are films and the carbon concentration is high. In addition, the initial M samples have many homogeneous lath interfaces and the ferrite has a strong carbon discharge ability during high‐temperature annealing, so the fraction of RA is the highest at 23.1% when annealed at 820 °C, and the corresponding carbon concentration is 1.16 wt%, so the final combination of strength and ductility is up to 32.1 GPa%.

show abstract

Combining a novel cyclic pre-quenching and two-stage heat treatment in a low-alloyed TRIP-aided steel to significantly enhance mechanical properties through microstructural refinement

Cited by 25 publications

References 34 publications

Facile route to bulk ultrafine-grain steels for high strength and ductility

Facile route to bulk ultrafine-grain steels for high strength and ductility

Microstructure and mechanical properties of a medium-carbon bainitic steel treated by quenching and two-step bainitic isothermal transformation below Ms

Influence of Initial Structures on the Mechanical Properties in Cold‐Rolled Transformation‐Induced Plasticity Steel

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