Precipitation and hot deformation behavior of austenitic heat-resistant steels: A review

Zhou, Yinghui; Liu, Yongchang; Zhou, Xiaosheng; Liu, Chenxi; Yu, Jie‐Hui; Huang, Yuan; Li, Huijun; Li, Wenya

doi:10.1016/j.jmst.2017.01.025

Cited by 119 publications

(38 citation statements)

References 97 publications

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“…The typical morphology of the primary Z-phase is showed in Figure 2. As residual particles, these precipitates were formed during solidification and are undissolved by the solution treatment [9,10]. The Z-phase in the as-received HR3C steel was also observed by Zieliński [3], while Bai [6] and Peng [11] reported the presence of primary Nb-rich MX particles in the as-received samples.…”

Section: Test Results and Their Analysismentioning

confidence: 92%

“…As surface defects, the grain boundaries are characterised by higher interfacial energy compared to that inside the grain and at the twin boundaries. As defects with a disordered structure, the grain boundaries are also the areas that enhance faster diffusion of alloying atoms compared to the grain interior [10,[16][17][18]. This allows for the preferred precipitation of M 23 C 6 carbides at the grain boundaries.…”

Section: Test Results and Their Analysismentioning

confidence: 99%

“…This allows for the preferred precipitation of M 23 C 6 carbides at the grain boundaries. The M 23 C 6 carbide precipitation process in austenitic steels is related to the reduction of carbon solubility with temperature [10]. Moreover, the precipitation of M 23 C 6 carbides is a process of redistribution and reduction of the strain energy [6].…”

Section: Test Results and Their Analysismentioning

confidence: 99%

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The Effect of Service on Microstructure and Mechanical Properties of HR3C Heat-Resistant Austenitic Stainless Steel

et al. 2020

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The physical metallurgical tests were performed on the test samples made of HR3C steel, taken from a section of a pipeline in the as-received condition and after approximately 26,000 h of service at 550 °C. In the as-received condition, the test material had austenitic microstructure with numerous large primary Z-phase precipitates inside the grains. The service of the test steel mainly contributed to the precipitation processes inside the grains and at the grain boundaries. After service, the following precipitates were identified in the microstructure of the test steel: Z-phase (NbCrN) and M23C6 carbides. The Z-phase precipitates were observed inside the grains, whereas M23C6 carbides - at the boundaries where they formed the so-called continuous grid. The service of the test steel contributed to the growth of the strength properties, determined both at room and elevated temperature (550, 600 °C), compared to the as-received condition. Moreover, the creep properties of HR3C steel after service were higher than those of the material in the as-received condition. The increase in the strength properties and creep resistance was connected with the growth of strengthening of the test steel by the precipitation of Z-phase and M23C6 carbides.

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Section: Test Results and Their Analysismentioning

confidence: 92%

Section: Test Results and Their Analysismentioning

confidence: 99%

Section: Test Results and Their Analysismentioning

confidence: 99%

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The Effect of Service on Microstructure and Mechanical Properties of HR3C Heat-Resistant Austenitic Stainless Steel

et al. 2020

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“…The 0.1C-18Cr-1Al-1Si FHSS is a strong candidate for the high-temperature application, which is related to the formation of uniform Cr 2 O 3 and Al 2 O 3 scales on its surface to improve the oxidation resistance [4]. However, the problem with increasing Cr content and adding Al is that this can lead to a formation of the M 23 C 6 -type (M=Cr and Fe) carbides and AlN precipitates, the coarsening rate of which will accelerate at high temperatures and in turn significantly affect the changes in mechanical properties during hot deformation [5][6][7][8]. FHSS exhibits the poor formability and abnormal grain coarsening at high temperatures [9,10].…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and precipitation behavior of the 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel during hot deformation

Zhang

Zou

Wei

et al. 2020

Mater. Res. Express

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The 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel has attracted considerable attention to high-temperature applications due to its favorable combination of creep and oxidation resistance. In this paper, the microstructural evolution and precipitation behavior of the 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel is studied from the compression deformation data in the temperature range of 850°C-1050°C and the strain rate range of 0.01-1 s −1 . Experimental results demonstrate that higher temperatures and lower strain rates enhance the dynamic recrystallization (DRX) process with remarkable effectiveness. The main precipitates are proved as the AlN phases and the (Cr,Fe) 23 C 6 carbides during hot deformation. With an increase in the deformation temperature, the size of (Cr,Fe) 23 C 6 and AlN gradually increases, and volume fraction gradually decreases. When the strain rate decreases, the average size and volume fraction of (Cr,Fe) 23 C 6 and AlN gradually increase. At the lower temperatures, the occurrence of dynamic recrystallization (DRX) is strongly influenced by (Cr,Fe) 23 C 6 formed on the grain boundaries, mainly because it causes a pinning effect, which hinders the movement of dislocations and delays the occurrence of the DRX.

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“…The alloys are commercially used for various temperature regimes, from cryogenic to elevated temperatures [2]. Especially, these alloys are prominent candidates for high-temperature parts of power breeding industries, superheater tubes and fired boilers [3][4][5]. These steels are highly recommended for various structural applications for an extended period of time with less maintenance due to their superior mechanical behavior and resistance to aggressive environments [6,7].…”

Section: Introductionmentioning

confidence: 99%

Modeling Mechanical Properties of 25Cr-20Ni-0.4C Steels over a Wide Range of Temperatures by Neural Networks

Narayana

Kim

Maurya

et al. 2020

Metals

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From the point of view of designing materials, it is important to study the complex correlational research that involves measuring several variables and assessing the relation among them. Hence, the notion of machine-oriented data modeling is explored. Among various machine-learning tools, artificial neural networks (ANN) have been used as a stimulating tool to solve engineering-related issues. In this study, the ANN model is designed and trained to correlate the complex relations among composition, temperature and mechanical properties of 25Cr-20Ni-0.4C austenitic stainless steel. The developed model was exploited to estimate the composition-property and temperature-property correlations. The ANN predictions are well suitable for experimental results. The model was able to correlate the complex nature among input and output variables. The model was used to investigate the effect of service temperature on the mechanical properties of 25Cr-20Ni-0.4C steels over a wide temperature range. The effective response of the alloying elements on the mechanical properties of ambient as well as elevated temperatures was quantitatively estimated with the help of the index of relative importance (IRI) method. Hence, this handy technique is the best tool to overcome the designing complications and to develop the components having remarkable properties.Keywords: 25Cr-20Ni-0.4C steels; mechanical properties; artificial neural networks; simulation and modeling; index of the relative importance

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Precipitation and hot deformation behavior of austenitic heat-resistant steels: A review

Cited by 119 publications

References 97 publications

The Effect of Service on Microstructure and Mechanical Properties of HR3C Heat-Resistant Austenitic Stainless Steel

The Effect of Service on Microstructure and Mechanical Properties of HR3C Heat-Resistant Austenitic Stainless Steel

Microstructural evolution and precipitation behavior of the 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel during hot deformation

Modeling Mechanical Properties of 25Cr-20Ni-0.4C Steels over a Wide Range of Temperatures by Neural Networks

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