A new application of unified constitutive equations for cross wedge rolling of a high-speed railway axle steel

Huo, Yuanming; Bai, Qian; Wang, Baoyu; Lin, Jianguo; Zhou, Jing

doi:10.1016/j.jmatprotec.2015.04.011

Cited by 65 publications

(11 citation statements)

References 27 publications

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“…The unified viscoplastic constitutive equations were developed to predict flow stress and microstructure evolution for many types of metal materials [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Recovery, recrystallization, grain size, and dislocation density were well described in the framework of the unified viscoplastic constitutive model.…”

Section: Constitutive Equations and Microstructural Model Of 21-4nmentioning

confidence: 99%

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Huang

et al. 2018

Metals

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Abstract:Valve microstructure is important during hot forging. Austenitic 21-4N steel is often used in exhaust valves. In this study, the microstructure evolution of the forging valve process was predicted using the internal state variables (i.e., average grain size, recrystallized fraction, and dislocation density) modus for 21-4N. First, 21-4N was subjected to hot compression tests on a Gleeble-1500D and static grain growth tests in a heating furnace. A set of uniform viscoplastic constitutive equations was established based on experimental data. Next, the determined unified constitutive equations were conducted in DEFORM-3D, and the microstructure evolution of 21-4N during forging was calculated. Finally, the simulation results of grain size evolution were validated via experiments. Results showed good consistency between the simulations and experiments. Thus, the models adequately predicted the microstructure evolution.

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Section: Constitutive Equations and Microstructural Model Of 21-4nmentioning

confidence: 99%

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Huang

et al. 2018

Metals

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“…where k is the initial yield stress, r v the viscoplastic stress, and H the isotropic hardening stress. A hyperbolic sine law is introduced to describe the viscoplastic flow, which is suitable for a wide range of temperatures and strain rates [23,24] _…”

Section: Constitutive Isv Model 41 Flow Stress Decompositionmentioning

confidence: 99%

Physical-based constitutive model considering the microstructure evolution during hot working of AZ80 magnesium alloy

Sun

et al. 2019

Adv. Manuf.

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A physical-based constitutive model was developed to model the viscoplastic flow behavior and microstructure evolution of AZ80 magnesium alloy during the hot working process. The competing deformation mechanisms, including work hardening, dynamic recovery, and dynamic recrystallization, in an isothermal compression environment were considered in the model. The internal state variables, including the normalized dislocation density and recrystallized volume fraction, were incorporated into the model to articulate the microstructure evolution during hot deformation. The kinetic condition critical for dynamic recrystallization, considering the effects of the deformation temperature and strain rate, was obtained by employing both the Poliak-Jonas criterion and Zener-Hollomon parameter. Microstructure observations indicate that the recrystallized volume fraction increases with decreasing Z parameter at constant strain, which is consistent with the predicted kinetics model. Based on the developed model, a good correlation was also obtained between the predicted and experimental flow stress. The results indicate a good predictability of the model in describing the hot deformation behavior and microstructure evolution of AZ80 magnesium alloy.

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“…Zhou et al [24] investigated the influence of tool parameters on tool wear in a two-roll CWR by simulation and as manifested by the statistical data from factories. Meanwhile, Huo et al [25][26][27] used a set of constitutive equations to predict the microstructure and ductile damage of a high-speed railway axle steel during CWR. Novella et al [28] modelled the ductile damage for CWR of AA6082-T6 bars.…”

Section: Working Principle Of Cross Wedge Rollingmentioning

confidence: 99%

Research and industrialization of near-net rolling technology used in shaft parts

2018

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Shaft part rolling is an efficient and green nearnet shaping technology offering many advantages, including high production efficiency, high material utilization rate, high product quality, and excellent production environment. In this paper, the features of shaft part rolling are introduced along with the working principles of two main shaft part rolling technologies, namely, cross wedge rolling (CWR) and skew rolling (SR). In relation to this technology, some R&D achievements gained by the University of Science and Technology Beijing are summarized. Finally, the latest developments in shaft part rolling are presented, including SR steel balls, precise forming of camshaft blank by CWR, SR phosphorous copper balls at room temperature, and CWR hollow axle sleeve. Although the shaft part rolling technology has been widely used in China, it only accounts for about 15% of applicable parts at present. Nevertheless, this technology has broad application prospects.

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A new application of unified constitutive equations for cross wedge rolling of a high-speed railway axle steel

Cited by 65 publications

References 27 publications

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Physical-based constitutive model considering the microstructure evolution during hot working of AZ80 magnesium alloy

Research and industrialization of near-net rolling technology used in shaft parts

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