Austenite stability for quenching and partitioning treated steel revealed by colour tint-etching method

Zhao, Hongyu; Zhu, Xu; Li, W.; Jin, Xianglin; Wang, L.; Jiao, Hui-sheng; Jiang, Dongmei

doi:10.1179/1743284714y.0000000517

Cited by 21 publications

(22 citation statements)

References 18 publications

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“…The Q&P treated steel used in this study is composed of ferrite (F), martensite (M) and RA, which can be effectively distinguished by color-tint etching method. The RA is stabilized by carbon atoms partitioned from martensite into austenite [31][32][33][34], and is found present in different matrix phases [35]. Thus, Q&P treated steel is an ideal material for studying the deformation behavior of the matrix phases and the role of RA in different matrix phases.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the relationship between retained austenite locations and the deformation behavior of quenching and partitioning treated steels

Zhao

Zhu

et al. 2016

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Analysis of the relationship between retained austenite locations and the deformation behavior of quenching and partitioning treated steels

Zhao

Zhu

et al. 2016

Materials Science and Engineering: A

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“…[27] These specimens were observed under an optical microscope equipped with a high-brightness halogen lamp (ZEISS AxidoCam MRC5). The samples for XRD (Ultima IV Rigaku), EBSD (AZTEC HKL), and TEM (JEOL 2100) were electrolytically or twin-jet polished with an electrolyte consisting of 5 pct perchloric acid and 95 pct glacial acetic acid at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Color-tint-etching method has been proved an effective way to distinguish the three phases in our previous study. [27,29,30] Martensite and ferrite can be distinguished under the normal pattern, as shown in Figure 1(a). The sodium metabisulfite tinted the ferrite and martensite but not the austenite [31] which appears as the white phase in Figure 1(b).…”

Section: A Evolution Of Microstructuresmentioning

confidence: 96%

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The Deformation Behavior Analysis and Mechanical Modeling of Step/Intercritical Quenching and Partitioning-Treated Multiphase Steels

Zhao

Wang

et al. 2016

Metall Mater Trans A

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TWO types of multiphase steels containing blocky or fine martensite have been used to study the phase interaction and the TRIP effect. These steels were obtained by step-quenching and partitioning (S-QP820) or intercritical-quenching and partitioning (I-QP800 & I-QP820). The retained austenite (RA) in S-QP820 specimen containing blocky martensite transformed too early to prevent the local failure at high strain due to the local strain concentration. In contrast, plentiful RA in I-QP800 specimen containing finely dispersed martensite transformed uniformly at high strain, which led to optimized strength and elongation. By applying a coordinate conversion method to the microhardness test, the load partitioning between ferrite and partitioned martensite was proved to follow the linear mixture law. The mechanical behavior of multiphase S-QP820 steel can be modeled based on the Mecking-Kocks theory, Bouquerel's spherical assumption, and Gladman-type mixture law. Finally, the transformation-induced martensite hardening effect has been studied on a bake-hardened specimen.

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“…Although it has been recognized that the volume fraction and stability of retained austenite play a critical role in enhancing mechanical properties, [8,16,25,41,42] the studies on the correlations between retained austenite characteristics and impact properties were relatively limited. On the other hand, the contributions of retained austenite to ductility and low-temperature impact toughness are inconsistent.…”

Section: B Effect Of Volume Fraction and Stability Of Retained Austementioning

confidence: 99%

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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Austenite stability for quenching and partitioning treated steel revealed by colour tint-etching method

Cited by 21 publications

References 18 publications

Analysis of the relationship between retained austenite locations and the deformation behavior of quenching and partitioning treated steels

Analysis of the relationship between retained austenite locations and the deformation behavior of quenching and partitioning treated steels

The Deformation Behavior Analysis and Mechanical Modeling of Step/Intercritical Quenching and Partitioning-Treated Multiphase Steels

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

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