Dependence of austenite stability and deformation behavior on tempering time in an ultrahigh strength medium Mn TRIP steel

Zhou, Naipeng; Song, Ren‐Jie; Li, Xuan; Li, Jiajia

doi:10.1016/j.msea.2018.09.098

Cited by 28 publications

(9 citation statements)

References 28 publications

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“…In our previous study, it was reported that the ductility of medium‐Mn TRIP steel is primarily controlled by TRIP effect. [ 28 ] To illustrate the SIMT with varying strain rates, an XRD test was conducted on the samples after tensile deformation. Figure 5 shows the XRD spectra and the calculated austenite fraction of the samples deformed at a strain rate of 10 −4 –10 −1 s −1 .…”

Section: Discussionmentioning

confidence: 99%

Strain Rate Effect on Microstructural Evolution and Deformation Behavior of Medium‐Mn Transformation‐Induced Plasticity Steels

Zhou

Song

Huo

et al. 2020

steel research int.

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Herein, the effect of strain rate (10−4–10−1 s−1) on the microstructural evolution and deformation behavior of medium‐Mn transformation‐induced plasticity (TRIP) steels is investigated. The steel after intercritical annealing exhibits an austenite–martensite–ferrite triplex microstructure with a relatively high austenite fraction (66.1%). A negative strain rate dependence of ultimate tensile strength (UTS) and significant serrated behavior are found during the room temperature tensile test. The total elongation (TE) attains a maximum value of 32.0% at the strain rate of 10−2 s−1 and then decreases with increasing strain rate. The evolution of strain‐induced martensitic transformation (SIMT) as a function of strain rate is analyzed considering the adiabatic heating during deformation. The different degrees of SIMT under different strain rates lead to a fracture transition between quasicleavage fracture and ductile fracture. The delamination cracks originating from the interface of martensite and austenite are closely related with the quantity and the local strain of the martensite–austenite interface.

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Section: Discussionmentioning

confidence: 99%

Strain Rate Effect on Microstructural Evolution and Deformation Behavior of Medium‐Mn Transformation‐Induced Plasticity Steels

Zhou

Song

Huo

et al. 2020

steel research int.

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“…The main effect of tempering is to promote diffusion of carbon from ferrite to austenite, which enhances the stability of austenite, leading to superior TRIP effect and excellent mechanical properties. [25][26][27][28][29][30].…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Design of an effective heat treatment involving intercritical hardening for high-strength–high elongation of 0.2C–1.5Al–(6–8.5)Mn-Fe TRIP steels: Microstructural evolution and deformation behaviour

Zhang

Mou

et al. 2020

Materials Science and Technology

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We propose an effective heat treatment involving a combination of intercritical hardening and tempering to obtain high strength–high ductility in hot-rolled 0.2C–1.5Al–(6–8.5)Mn–Fe transformation-induced plasticity (TRIP) steels. An excellent combination of high ultimate tensile strength of 1045–1380 MPa and total elongation of 34–39% was obtained when the steels were subjected to intercritical hardening at 630–650 °C and tempered at 200 °C. Intercritical hardening impacted the co-existence of austenite, ferrite and martensite, such that the deformation behaviour varied with the Mn content. The excellent properties of the steels were attributed to cumulative contribution of enhanced TRIP effect of austenite and ferrite and martensite constituents. The discontinuous TRIP eﬀect during tensile deformation involves stress relaxation and led to consequent enhancement of ductility.

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“…The high amount of martensite was responsible for the low fracture strain and ductility. Improvement of austenite stability increased the ultimate tensile strength and total elongation of TRIP steel [8]. Furthermore, Mou et al [9] found that lamellar austenite was more likely to cause stress relaxation during martensitic transformation, resulting in a discontinuous TRIP effect and thus higher ductility.…”

Section: Introductionmentioning

confidence: 99%

Study on High-Temperature Mechanical Properties of Fe–Mn–C–Al TWIP/TRIP Steel

Yang

Zhuang

et al. 2021

Metals

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In this study, high-temperature tensile tests were carried out on a Gleeble-3500 thermal simulator under a strain rate of ε = 1 × 10−3 s−1 in the temperature range of 600–1310 °C. The hot deformation process of Fe–15.3Mn–0.58C–2.3Al TWIP/TRIP at different temperatures was studied. In the whole tested temperature range, the reduction of area ranged from 47.3 to 89.4% and reached the maximum value of 89.4% at 1275 °C. Assuming that 60% reduction of area is relative ductility trough, the high-temperature ductility trough was from 1275 °C to the melting point temperature, the medium-temperature ductility trough was 1000–1250 °C, and the low-temperature ductility trough was around 600 °C. The phase transformation process of the steel was analyzed by Thermo-Calc thermodynamics software. It was found that ferrite transformation occurred at 646 °C, and the austenite was softened by a small amount of ferrite, resulting in the reduction of thermoplastic and formation of the low-temperature ductility trough. However, the small difference in thermoplasticity in the low-temperature ductility trough was attributed to the small amount of ferrite and the low transformation temperature of ferrite. The tensile fracture at different temperatures was characterized by means of optical microscopy and scanning electron microscopy. It was found that there were Al2O3, AlN, MnO, and MnS(Se) impurities in the fracture. The abnormal points of thermoplasticity showed that the inclusions had a significant effect on the high-temperature mechanical properties. The results of EBSD local orientation difference analysis showed that the temperature range with good plasticity was around 1275 °C. Under large deformation extent, the phase difference in the internal position of the grain was larger than that in the grain boundary. The defect density in the grain was large, and the high dislocation density was the main deformation mechanism in the high-temperature tensile process.

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Dependence of austenite stability and deformation behavior on tempering time in an ultrahigh strength medium Mn TRIP steel

Cited by 28 publications

References 28 publications

Strain Rate Effect on Microstructural Evolution and Deformation Behavior of Medium‐Mn Transformation‐Induced Plasticity Steels

Strain Rate Effect on Microstructural Evolution and Deformation Behavior of Medium‐Mn Transformation‐Induced Plasticity Steels

Design of an effective heat treatment involving intercritical hardening for high-strength–high elongation of 0.2C–1.5Al–(6–8.5)Mn-Fe TRIP steels: Microstructural evolution and deformation behaviour

Study on High-Temperature Mechanical Properties of Fe–Mn–C–Al TWIP/TRIP Steel

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