Hot deformation behavior and microstructure analysis of 25Cr3Mo3NiNb steel during hot compression tests

Xu, Liang; Liang, Chunyong; Chen, Gaojin; Wang, Maoqiu

doi:10.1016/j.vacuum.2017.10.017

Cited by 69 publications

(29 citation statements)

References 36 publications

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“…In Figure 1d, especially at 1100 and 1150 • C, the stress shows only a slight decrease after the strain of 0.4 and the difference between the peak stress and the steady-state stress is small after the true strain of 0.8. At the same time, we observe that the flow stress tends to reach a steady state at high temperatures and low strain rates, which may be a consequence of higher temperatures and lower strain rates promoting the volume fraction of DRX [31]. These results are consistent with the results of flow softening.…”

Section: Introductionsupporting

confidence: 88%

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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Section: Introductionsupporting

confidence: 88%

Hot Deformation Behavior and Constitutive Modeling of H13-Mod Steel

Liu

Tan

et al. 2018

Metals

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“…Where A , 1 a, b, g and h are the model parameters which reflect the influences of strain, strain rate and temperature on the flow stress. When the temperature and strain rate are constants, the modified J-C model can be denoted as The experimental data at the condition of (950°C, 5 s −1 ) were applied to determine the values of parameters in equation (11). As shown in figure 14, the relationship between s ln and e ln is demonstrated and a secondorder polynomial was adopted to fit the data.…”

Section: Flow Stress Modelingmentioning

confidence: 99%

“…In order to develop the reliability of the hot forming process, the finite element(FE) simulation can be an effective approach to promote the forging technology with shape-controlling and property-controlling strategies. To carry out an effective evaluation of the material flow behavior and the stress/strain distribution, it is essential to establish a precise constitutive equation to describe the features of the flow stress variation during the hot forming process [10][11][12]. Several kinds of constitutive models, including the physical-based models and phenomenological models, were proposed to express the true stress-true strain relationships, and the accuracy and applicability were investigated.…”

Section: Introductionmentioning

confidence: 99%

Ductile fracture behavior and flow stress modeling of 17-4PH martensitic stainless steel in tensile deformation at high temperature

Feng¹,

Zhang²,

Wu³

et al. 2020

Mater. Res. Express

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The ductile fracture behavior of 17-4PH martensitic stainless steel at high temperature was investigated based on the experimental data of hot uniaxial tensile test. The elongation and reduction of area indicated that the ductility was mainly enhanced during the deformation at the temperature 1150°C-1200°C with high strain rate more than 0.1 s −1 . The hot flow stress curves were obtained from the tensile experiments, and the true strain of necking initiation was determined by analyzing the contours of fractured specimens. Then, the true stress-true strain data of the deformations before necking were adopted to establish the tensile flow stress model. In order to express the combined influences of the strain, strain rate and temperature on flow stress, a modified Johnson-Cook model was proposed to describe the hot constitutive behavior of the presented steel. It indicates that reasonable agreements between the model-predicted results and the experimental data were achieved.

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“…Based on the dynamic materials model(DMM), the processing map technology has been established as an effective approach to investigate the deformation mechanisms of materials and find the optimal processing parameters. It has been applied in various kinds of materials including steels [30,31], alloys of aluminum, magnesium, etc Xu et al [32] determined that the optimum condition for 25Cr3Mo3NiNb steel was at 1077-1177°C and 0.001-0.03 s −1 . Cai et al [33] suggested 1120°C-1160°C and 0.03-0.1 s −1 as the optimum process parameters by analyzing the processing maps.…”

Section: Introductionmentioning

confidence: 99%

Flow stress modeling, processing maps and microstructure evolution of 05Cr17Ni4Cu4Nb Martensitic stainless steel during hot plastic deformation

Zhou

Feng

et al. 2020

Mater. Res. Express

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The hot deformation behavior of 05Cr17Ni4Cu4Nb stainless steel at the temperatures from 950°C to 1250°C and strain rates from 0.01 s −1 to 5 s −1 was investigated on the basis of test data obtained by Gleeble1500D thermo-simulation machine. A two-stage flow stress constitutive model incorporating the effects of the strain rate and temperature on the deformation behavior is proposed. The stressstrain relations of 05Cr17Ni4Cu4Nb steel predicted by the proposed model agree well with the experimental results. Moreover, the hot processing maps are also investigated. Combined with the microstructure evolution analysis, the appropriate hot forming processing parameters of 05Cr17Ni4-Cu4Nb steel is proposed in the temperature range of 1000-1100°C and strain rate range of 0.01-0.02 s −1 .

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Hot deformation behavior and microstructure analysis of 25Cr3Mo3NiNb steel during hot compression tests

Cited by 69 publications

References 36 publications

Hot Deformation Behavior and Constitutive Modeling of H13-Mod Steel

Hot Deformation Behavior and Constitutive Modeling of H13-Mod Steel

Ductile fracture behavior and flow stress modeling of 17-4PH martensitic stainless steel in tensile deformation at high temperature

Flow stress modeling, processing maps and microstructure evolution of 05Cr17Ni4Cu4Nb Martensitic stainless steel during hot plastic deformation

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