Characterisation of mechanical behavior of 18CrNiMo7-6 steel with and without nb under warm forging conditions through processing maps analysis

Springer, Phillip; Prahl, Ulrich

doi:10.1016/j.jmatprotec.2016.05.021

Cited by 28 publications

(8 citation statements)

References 19 publications

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“…Regarding the original Arrhenius-type equation, it has been proposed by Sellars and Tegart [35] that a hyperbolic sine-type equation can be employed to correlate the saturation stress to the deformation conditions over a very wide range of stress, which is shown in Equation 4.…”

Section: The Original Strain-compensated Arrhenius-type (Osa-type) Eqmentioning

confidence: 99%

“…ε-value and σ-value in Equation (35). Because experimental and predicted values of stress are not equal, the deformation temperature value is not equal to T-value obtained from Equation (35 ε-value and σ-value of the 52 experimental data points in Equation (35). Moreover, the mean value of the set of T-value can be used as T * 2 .…”

Section: Solving the Equivalent Temperaturementioning

confidence: 99%

“…Therefore, 20Cr2Ni4A steel is widely applied to produce broad cross-section carburized parts. In previous research, there are many reports about the constitutive equation of metals and alloys at warm or hot temperatures [35][36][37][38][39]. The aim of the present study is that a higher-precision constitutive equation is established to describe the behavior of the 20Cr2Ni4A steel under a wider range, including warm forming and hot forming.…”

Section: Introductionmentioning

confidence: 98%

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Constitutive Equations for Describing the Warm and Hot Deformation Behavior of 20Cr2Ni4A Alloy Steel

Wang

Zhai

et al. 2020

Metals

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Isothermal hot compression tests of 20Cr2Ni4A alloy steel were performed under temperatures of 973–1273 K and strain rates of 0.001–1 s−1. The behavior of the flow stress of 20Cr2Ni4A alloy steel at warm and hot temperatures is complicated because of the influence of the work hardening, the dynamic recovery, and the dynamic recrystallization. Four constitutive equations were used to predict the flow stress of 20Cr2Ni4A alloy steel, including the original strain-compensated Arrhenius-type (osA-type) equation, the new modified strain-compensated Arrhenius-type (msA-type) equation, the original Hensel–Spittel (oHS) equation and the modified Hensel–Spittel (mHS) equation. The msA-type and mHS are developed by revising the deformation temperatures, which can improve prediction accuracy. In addition, we propose a new method of solving the parameters by combining a linear search with multiple linear regression. The new solving method is used to establish the two modified constitutive equations instead of the traditional regression analysis. A comparison of the predicted values based on the four constitutive equations was performed via relative error, average absolute relative error (AARE) and the coefficient of determination (R2). These results show the msA-type and mHS equations are more accurate and efficient in terms of predicting the flow stress of the 20Cr2Ni4A steel at elevated temperature.

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Section: The Original Strain-compensated Arrhenius-type (Osa-type) Eqmentioning

confidence: 99%

Section: Solving the Equivalent Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Constitutive Equations for Describing the Warm and Hot Deformation Behavior of 20Cr2Ni4A Alloy Steel

Wang

Zhai

et al. 2020

Metals

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“…For high-quality welding of hollow cylindrical products, it is necessary to have thickenings on the edge elements [1][2][3][4]. The most rational method of their production is plastic forming, that is, upsetting and forging of the workpieces.…”

Section: Introductionmentioning

confidence: 99%

Formation of bulges on hollow cylindrical products made of non-ferrous difficult-to-deform alloys

Ларин

Пасынков

2020

MATEC Web Conf.

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Formation of thickened elements on the edge parts of hollow cylindrical products, which serve as the elements of fuel lines of various power plants, can be applied to ensure a significant quality of their welding connection. The article deals with the formation of such thickening elements on tubes made of special non-ferrous alloys. Due to the mechanical features of these materials, these processes were investigated under narrow temperature and speed conditions causing short-term creep of the material. To analyze these operations, mathematical models have been created that describe power modes. Quantitative rules of the influence of the geometric parameters of the process on the pressure during the upsetting have been obtained. The materials obtained during the analysis can be used to create similar technologies.

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“…A lot of investigations on the effect of deformation parameters on deformation resistance have been reported. It is known that the smaller the deformation temperature, the larger is the deformation resistance.…”

mentioning

confidence: 99%

Effect of Strain Rate on Deformation Resistance during Ausforming in Fe–C–Mn–Si High‐Strength Bainite Steels

Chen

et al. 2018

steel research int.

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Deformation experiments for two bainite steels at different strain rates are conducted to analyze the effects of strain rate on deformation resistance during ausforming of two bainite steels. The results indicate that deformation resistance for medium-carbon steel increases with strain as well as strain rate due to work hardening. However, for low-carbon steel, although deformation resistance increases with strain due to work hardening, maximum flow stress unexpectedly appears in the specimen deformed at the smallest strain rate of 0.001 s À1 instead of the largest strain rate of 5.0 s À1 . Microstructure observation of specimens deformed at 0.001 s À1 and 1.0 s À1 of low-carbon bainite steel confirms that bainitic transformation induced by plastic deformation dominates the flow stress behavior of low-carbon bainite steel at strain rate from 0.001 to 1.0 s À1 . The present work provides the useful reference for the calculating of deformation force, setup of the deformation schedule, and safety check of processing equipment.

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Characterisation of mechanical behavior of 18CrNiMo7-6 steel with and without nb under warm forging conditions through processing maps analysis

Cited by 28 publications

References 19 publications

Constitutive Equations for Describing the Warm and Hot Deformation Behavior of 20Cr2Ni4A Alloy Steel

Constitutive Equations for Describing the Warm and Hot Deformation Behavior of 20Cr2Ni4A Alloy Steel

Formation of bulges on hollow cylindrical products made of non-ferrous difficult-to-deform alloys

Effect of Strain Rate on Deformation Resistance during Ausforming in Fe–C–Mn–Si High‐Strength Bainite Steels

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