Correlation between mechanical properties and retained austenite characteristics in a low-carbon medium manganese alloyed steel plate

Chen, Jun; Lv, Mengyang; Tang, Shuai; Liu, Zhenyu; Wang, Guodong

doi:10.1016/j.matchar.2015.05.026

Cited by 90 publications

(23 citation statements)

References 31 publications

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“…It has been recognized that only stable retained austenite can greatly enhance toughness [15,16,22], but the more stable retained austenite in general leads to poor strain hardening capacity, resulting in higher yield ratio and lower uniform ductility. So in the present work, the heat treating temperature was chosen at 650°C to produce relatively unstable retained austenite to obtain expected strain hardening capacity and excellent ductility.…”

Section: Toughening Mechanismsmentioning

confidence: 99%

“…Moreover, Since Miller proposed 0.11C-5.7Mn steel [9], the reverse transformation behavior, stabilization mechanisms of retained austenite, strain hardening behavior and tensile properties had been further understood [1][2][3][4][9][10][11][12][13][14]. It has been recognized that only sufficiently stable retained austenite in general leads to strong toughening [15,16]. Whereas the high stable retained austenite has few contributions to strain hardening capacity, resulting in the dramatic reduction in ductility.…”

Section: Introductionmentioning

confidence: 99%

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Combination of ductility and toughness by the design of fine ferrite/tempered martensite–austenite microstructure in a low carbon medium manganese alloyed steel plate

Chen

Liu

et al. 2015

Materials Science and Engineering: A

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Section: Toughening Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Combination of ductility and toughness by the design of fine ferrite/tempered martensite–austenite microstructure in a low carbon medium manganese alloyed steel plate

Chen

Liu

et al. 2015

Materials Science and Engineering: A

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“…[19,20] It is hence possible to develop a novel heavy steel plate with enhanced strength, ductility, and low-temperature impact toughness utilizing Mn element. However, it has been recognized that the contribution of metastable-retained austenite to strain hardening capacity and ductility is inconsistent with that to toughness in previous studies, [21,22] showing that the more stable the retained austenite, the more excellent the low-temperature impact toughness is and the poorer the strain hardening capacity and ductility are. In other words, the contributions of retained austenite to ductility and low-temperature impact toughness are opposed.…”

Section: Introductionmentioning

confidence: 84%

Influence of Heat Treatments on the Microstructural Evolution and Resultant Mechanical Properties in a Low Carbon Medium Mn Heavy Steel Plate

Chen

Liu

et al. 2016

Metall Mater Trans A

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In this study, the microstructural evolution and resultant mechanical properties in a low carbon medium Mn heavy steel plate were investigated in detail. The results show that the introduction of medium manganese alloy design in the heavy steel plate has been shown to achieve the outstanding combination of strength, ductility, low-temperature impact toughness, and strain hardening capacity. It has been found that the austenite phase mainly displays at martensitic lath boundaries and shows lath shape for the heat treating at 873 K (600°C) for 1 to 10 hours or 893 K (620°C) for 2 hours, and not all the austenite phase obeys the K-S or N-W orientation relationship with respect to abutting martensitic lath. Although the microstructure in the steel after heat treating at 873 K (600°C) for 1 to 10 hours is similar to each other, the resultant mechanical properties are very different because the volume fraction and stability of retained austenite vary with the heat treatments. The best low-temperature impact toughness is achieved after heat treating at 873 K (600°C) for 2 hours due to the formation of a considerable volume fraction of retained austenite with relatively high stability, but the strain hardening capacity and ductility are disappointing because of insufficient TRIP effect. Based on enhancing TRIP effect, the two methods have been suggested. One is to increase the isothermal holding temperature to 893 K (620°C), and the other one is to prolong the isothermal holding time to 10 hours at 873 K (600°C). The two methods can significantly increase strain hardening capacity and ductility nearly without harming low-temperature impact toughness. In addition, the stability of retained austenite has been discussed by the quantitative analysis and it has been demonstrated that the stability of retained austenite is related to the chemical composition, size, and morphology. Moreover, the isothermal holding temperature has a great effect on the stability of retained austenite, while the effect of the isothermal holding time is relatively poor.

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“…Thus, the detection and estimation of retained austenite in respect of its amount, size and distribution, besides thermal stability, have been considered to be a key factor in the design and manufacturing of these high strength micro-composite steels [7,[10][11][12][13][14]. So far, various qualitative and quantitative materials characterization techniques have been used by several investigators to detect and measure the amount of retained austenite in the heat treatable micro-composite steels and these include conventional light optical microscopy [15][16][17][18], color metallography [14,16,18,19], X-ray diffraction (XRD) [20][21][22][23][24][25][26][27], dilatometry method [20,[28][29][30][31], magnetic properties measurement [12,27,[32][33][34], differential thermal analysis (DTA) [35,36], differential scanning calorimetry (DSC) [20,37,38], electron backscatter diffraction (EBSD) [9,14,[39][40][41][42]…”

Section: Introductionmentioning

confidence: 99%

Detection and Estimation of Retained Austenite in a High Strength Si-Bearing Bainite-Martensite-Retained Austenite Micro-Composite Steel after Quenching and Bainitic Holding (Q&B)

Pashangeh

Zarchi

Banadkouki

et al. 2019

Metals

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To develop an advanced high strength steel with reasonable ductility based on low alloying concept as well as micro-composite microstructure essentially consisting of bainite, martensite and retained austenite, a Si-bearing, low alloy medium carbon sheet steel (DIN1.5025 grade) was subjected to typical quenching and bainitic holding (Q&B) type isothermal treatment in the bainitic region close to martensite start temperature (Ms) for different durations in the range 5s to 1h. While the low temperature bainite has the potential to provide the required high strength, a small fraction of finely divided austenite stabilized between the bainitic laths is expected to provide the desired elongation and improved work hardening. Various materials characterization techniques including conventional light metallography, field emission scanning electron microscopy FE-SEM, electron backscatter diffraction (EBSD), differential thermal analysis, X-ray diffraction (XRD) and vibrating sample magnetometry (VSM), were used to detect and estimate the volume fraction, size and morphology and distribution of retained austenite in the micro-composite samples. The results showed that the color light metallography technique using LePera’s etching reagent could clearly reveal the retained austenite in the microstructures of the samples isothermally held for shorter than 30s, beyond which an unambiguous distinction between the retained austenite and martensite was imprecise. On the contrary, the electron microscopy using a FE-SEM was not capable of identifying clearly the retained austenite from bainite and martensite. However, the EBSD images could successfully distinguish between bainite, martensite and retained austenite microphases with good contrast. Although the volume fractions of retained austenite measured by EBSD are in accord with those obtained by XRD and color light metallography, the XRD measurements showed somewhat higher fractions owing to its ability to acquisition and analyze the diffracted X-rays from very finely divided retained austenite, too. The differential thermal analysis and vibrating sample magnetometry techniques also confirmed the stabilization of retained austenite finely divided in bainite/martensite micro-composite microstructures. In addition, the peak temperatures and intensities corresponding to the decomposition of retained austenite were correlated with the related volume fractions and carbon contents measured by the XRD analysis.

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Correlation between mechanical properties and retained austenite characteristics in a low-carbon medium manganese alloyed steel plate

Cited by 90 publications

References 31 publications

Combination of ductility and toughness by the design of fine ferrite/tempered martensite–austenite microstructure in a low carbon medium manganese alloyed steel plate

Combination of ductility and toughness by the design of fine ferrite/tempered martensite–austenite microstructure in a low carbon medium manganese alloyed steel plate

Influence of Heat Treatments on the Microstructural Evolution and Resultant Mechanical Properties in a Low Carbon Medium Mn Heavy Steel Plate

Detection and Estimation of Retained Austenite in a High Strength Si-Bearing Bainite-Martensite-Retained Austenite Micro-Composite Steel after Quenching and Bainitic Holding (Q&B)

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