Hot deformation characteristics and processing map of a phosphorous modified super austenitic stainless steel

Babu, K. Arun; Mandal, Sumantra; Athreya, C.N.; Shakthipriya, B.; Sarma, V. Subramanya

doi:10.1016/j.matdes.2016.11.054

Cited by 124 publications

(33 citation statements)

References 56 publications

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“…During hot deformation, the dominant softening mechanisms of the 0.1C-18Cr-1Al-1Si FHSS are DRV and DRX, and this is consistent with other materials [19][20][21][22]. Furthermore, DRX of the 0.1C-18Cr-1Al-1Si FHSS is greatly affected by the strain rate and the deformation temperature.…”

Section: Experimental Flow Curvessupporting

confidence: 83%

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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Section: Experimental Flow Curvessupporting

confidence: 83%

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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“…At the temperature of 1150 • C, the recrystallization was completed. With increasing strain rate, the grain size gradually became smaller, because the recrystallized grains had less time to grow, which was also found in the literature [19][20][21]. The results in Figures 5 and 6 could explain the different flow behaviors of 300M steel at 0.01 s −1 and 10 s −1 in Figure 2.…”

Section: Microstructure Evolutionsupporting

confidence: 80%

Hot Workability of 300M Steel Investigated by In Situ and Ex Situ Compression Tests

Chen

Xiao

Wang

et al. 2019

Metals

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In this work, hot compression experiments of 300M steel were performed at 900-1150 • C and 0.01-10 s −1 . The relation of flow stress and microstructure evolution was analyzed. The intriguing finding was that at a lower strain rate (0.01 s −1 ), the flow stress curves were single-peaked, while at a higher strain rate (10 s −1 ), no peak occurred. Metallographic observation results revealed the phenomenon was because dynamic recrystallization was more complete at a lower strain rate. In situ compression tests were carried out to compare with the results by ex situ compression tests. Hot working maps representing the influences of strains, strain rates, and temperatures were established. It was found that the power dissipation coefficient was not only related to the recrystallized grain size but was also related to the volume fraction of recrystallized grains. The optimal hot working parameters were suggested. This work provides comprehensive understanding of the hot workability of 300M steel in thermal compression.

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“…As evident from Figure 14a, the lower temperature allows the deformed grains to coexist with the recrystallized grains and the value of η is low (17%) under this condition. Other authors have suggested that this microstrip structure is an unstable phenomenon at high strain rates [58].…”

Section: Microstructurementioning

confidence: 91%

Hot Deformation Behavior and Constitutive Modeling of H13-Mod Steel

Liu

Tan

et al. 2018

Metals

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The H13-mod steel optimized by composition and heat treatment has reached the performance index of the shield machine hob. The hot deformation behavior of the H13-mod steel was investigated by compression tests in the temperature range from 900 to 1150 • C and the strain rate range from 0.01 to 10 s −1 . The true stress-strain curve showed that the rising stress at the beginning of deformation was mainly caused by work hardening. After the peak stress was attained, the curve drop and the flow softening phenomenon became more obvious at low strain rates. The flow behavior of the H13-mod steel was predicted by a strain-compensated Arrhenius-type constitutive equation. The relationship between the material constant in the Arrhenius-type constitutive equation and the true strain was established by a sixth-order polynomial. The correlation coefficient between the experimental value and the predicted value reached 0.987, which indicated that the constitutive equation can accurately estimate the flow stress during the deformation process. A good linear correlation was achieved between the peak stress (strain), critical stress (strain) and the Zener-Hollomon parameters. The processing maps of the H13-mod steel under different strains were established. The instability region was mainly concentrated in the high-strain-rate region; however, the microstructure did not show any evidence of instability at high temperatures and high strain rates. Combined with the microstructure and electron backscattered diffraction (EBSD) test results under different deformations, the optimum hot working parameters were concluded to be 998-1026 • C and 0.01-0.02 s −1 and 1140-1150 • C and 0.01-0.057 s −1 . mechanical properties of H13 steel by optimizing the composition and heat-treatment conditions and applying surface treatments [7][8][9][10][11][12][13]. However, the H13 steel prepared by these processes does not demonstrate a good match between strength and toughness and cannot be used under complex geological conditions. Therefore, the development of a hob material with both strength and toughness is important.An increase in the carbon content of steel is well known to increase its strength and decrease its plastic toughness. However, an excessively high carbon content causes an increase in the brittleness of the steel. Therefore, we strictly controlled the carbon content in the range from 0.48% to 0.52%, optimized the content of other major alloying elements, reduced the impurity content and controlled the shape and size of inclusions to improve the performance of steel. The modified H13 steel, hereafter referred to as H13-mod, was developed by optimizing the heat-treatment conditions. Its hardness reaches 57 HRC and its impact toughness is 15 J/cm 2 , which fully satisfies the performance requirements of the shield hob.H13-mod exhibits excellent mechanical properties. However, whether it can be processed into a qualified part product is not only determined by the material's characteristics but also by the processing technology. At the ...

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Hot deformation characteristics and processing map of a phosphorous modified super austenitic stainless steel

Cited by 124 publications

References 56 publications

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

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

Hot Workability of 300M Steel Investigated by In Situ and Ex Situ Compression Tests

Hot Deformation Behavior and Constitutive Modeling of H13-Mod Steel

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