### Hot Deformation Behavior and Flow Stress Prediction of TC4

Mar 21 2015 · Acknowledgments. The authors would like to acknowledge the support of the Major State Basic Research Development Program of China (973 Program) with No. 2007CB613807 the Doctoral Fund of Ministry of Education of China with No. the New Century Excellent Talents in University with No. NCET and the Doctoral Fund of Ministry of Education of China with No.

Get Price### Comparison of Prediction Capabilities of Flow Stress by

One of the important objectives of studies on the hot deformation of materials is the development of constitutive equations that represent the flow stress of the material as a function of strain strain rate and temperature useful for the structural designers in finite element analysis.

Get Price### Hot Deformation Characteristic and Strain Dependent

An effort has been made to establish a relation between Zener-Hollomon parameter flow stress and dynamic recrystallization (DRX). In this context the plastic flow behavior of Ti Nb stabilized interstitial free (IF) steel was investigated in a temperature range of °C and at constant true strain rates in the range 10 -3 -10 s-1 to a total true strain of 0.7.

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Prediction of the flow stress is a significant step to optimize the hot working processes. In order to establish a proper deformation constitutive equation the compressive deformation behavior of

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Apr 27 2020 · The flow stress curves exhibit the combined effects of the strain strain rate and temperature. In the initial stage of deformation the flow stress rises rapidly with the increasing of strain due to the work hardening (WH) caused by dislocation generation and multiplication 41 42 .

Get Price### FLOW FORMING A REVIEW OF RESEARCH

The flow forming process manufactures rotational components using deformation forces generated by rotating rollers that compress and stretch a blank (called a preform) though consecutive stages over a mandrel. Despite the limited commercial applications of the process a steady stream of research into its

Get Price### Flow Stress Modelling and Microstructure Development

A constant strain hardening rate is characteristic for large strain deformation at low temperatures and often observed during wire drawing. This stage of deformation in the following referred to as stage IV is determined by the microstructural evolution of dislocation cells. At elevated temperatures rapid stress saturation is typically reached and no stage IV behavior is observed.

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The flow stress curves of the experimental steel acquired from hot deformation at different working parameters are exhibited in Fig. 3. An obvious observation is the sensitivity of true stress corresponding to various compressive temperature strain and strain rate.

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The hot deformation characteristics of Nickel‐based corrosion resistant alloy was studied in the temperature range of 1050°C to 1200°C and the strain rate range of 0.001 to 0.1 second −1 by employing hot compression tests. The results show that the peak stress increases with decreasing temperature and increasing strain rate and the apparent activation energy is about 409 kJ/mol. Based

Get Price### Polycrystalline Model Predictions of Flow Stress and

A series of mechanical tests in different specimen orientations was performed to study the anisotropic behavior of an IF steel (DC06). State-of-the-art polycrystalline models Alamel 1 VPSC 2 as well as the classical FC Taylor model were employed to predict flow stress curves. A two-stage Voce law was used to describe the single crystal shear stress-accumulated shear strain relationship.

Get Price### Deformation and flow mechanics Britannica

Deformation and flow in physics alteration in shape or size of a body under the influence of mechanical forces. Flow is a change in deformation that continues as long as the force is applied. A brief treatment of deformation and flow follows. For full treatment see mechanics. Everyday substances

Get Price### A Characterization for the Constitutive Relationships of

Generally the hot deformation behavior of metals is described by the phenomenological or physical-based constitutive model. However the accuracy of the flow stress predicted by the regression

Get Price### Constitutive equations for high temperature flow stress

In terms of the curvilinear trend of the flow stress the well-known Arrhenius equation can be used to establish the relationship between the flow stress strain rate and temperature during hot deformation. Simultaneously the combined effects of temperature and Fig. 1 True stress

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elastoplastic body deformation as the sum of rates of elastic deformation and plastic flow (Petrov 2015) AB) M (3) in which Mmodules of elasticity accepted in rheology. (3) solution under constant rate of deformation C 0 1 A t BC (4) where at the time t the stress

Get Price### Hot Deformation Behavior and Flow Stress Prediction of TC4

Mar 21 2015 · Acknowledgments. The authors would like to acknowledge the support of the Major State Basic Research Development Program of China (973 Program) with No. 2007CB613807 the Doctoral Fund of Ministry of Education of China with No. the New Century Excellent Talents in University with No. NCET and the Doctoral Fund of Ministry of Education of China with No.

Get Price### A Characterization for the Deformation Behavior of As-Cast

The deformation characteristics of as-cast P91 alloy steel were investigated by means of the unidirectional hot compression experiments over a practical range of temperatures and strain rates. According to the results the flow stress is sensitive to the work hardening and the critical strain.

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Based on this an equation for predicting stress-strain relationship during compression-induced deformation of gangue backfill materials under multi-factor coupling effects was established. Comparison with the orthogonal test results shows that this equation can predict compression-induced deformation of gangue backfill materials in goaf.

Get Price### Hot deformation characteristics and kinetics analysis for

The hot deformation characteristics of Nickel‐based corrosion resistant alloy was studied in the temperature range of 1050°C to 1200°C and the strain rate range of 0.001 to 0.1 second −1 by employing hot compression tests. The results show that the peak stress increases with decreasing temperature and increasing strain rate and the apparent activation energy is about 409 kJ/mol. Based

Get Price### Flow Stress Modelling and Microstructure Development

In combination with thermally activated yield stress prediction this model recently implemented in the software package MatCalc offers a powerful tool for flow-curve simulation. A constant strain hardening rate is characteristic for large strain deformation at low

Get Price### Comparison of Prediction Capabilities of Flow Stress by

One of the important objectives of studies on the hot deformation of materials is the development of constitutive equations that represent the flow stress of the material as a function of strain strain rate and temperature useful for the structural designers in finite element analysis.

Get Price### Prediction of steel flow stresses under hot working conditions

ABSTRACT. An austenitic stainless steel was deformed in torsion over a temperature range of °C using strain rates of 1 5 and 10 s-1.The stress vs. strain curves determined were corrected for deformation heating and the flow stress was found to rise in the initial work-hardening regime reaching a maximum before dropping to the steady state due to softening brought about by dynamic

Get Price### Compressive Flow Behaviour and Deformation Instabilities

May 30 2020 · A constitutive equation is formulated by using the experimental flow stress data to depict the flow characteristics of the steel. An excellent correspondence (R = 0.99 and AARE = 5.2 ) between the experimental and predicted flow stress data has been obtained. Further we have predicted the deformation instabilities in the present steel based on

Get Price### A Characterization for the Constitutive Relationships of

The true compressive stress-strain curves obtained from the hot compression tests of 42CrMo steel are depicted in Figure 2. The flow stress as well as the shape of the flow curves is sensitively dependent on temperature and strain rate. From the stress-strain curves

Get Price### Compressive Flow Behaviour and Deformation Instabilities

May 30 2020 · A constitutive equation is formulated by using the experimental flow stress data to depict the flow characteristics of the steel. An excellent correspondence (R = 0.99 and AARE = 5.2 ) between the experimental and predicted flow stress data has been obtained. Further we have predicted the deformation instabilities in the present steel based on

Get Price### Incremental Formulation for the Prediction of Flow Stress

In order to develop this forming technology which may be called "macroscopic microscopic materials processing" theoretical predictions of plastic deformation as well as microstructural changes are indispensable. A new mathematical formulation to predict flow stress and microstructural change in hot forming will be presented in this paper.

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To elucidate the hot deformation characteristics of TiAl alloys flow stress prediction microstructural evolution and deformation mechanisms were investigated in Ti-44Al-5Nb-1Mo-2V-0.2B alloy by isothermal compression tests. A constitutive relationship using the Arrhenius model involving strain com

Get Price### Flow Stress Modelling and Microstructure Development

A constant strain hardening rate is characteristic for large strain deformation at low temperatures and often observed during wire drawing. This stage of deformation in the following referred to as stage IV is determined by the microstructural evolution of dislocation cells. At elevated temperatures rapid stress saturation is typically reached and no stage IV behavior is observed.

Get Price### Compressive Flow Behaviour and Deformation Instabilities

May 30 2020 · A constitutive equation is formulated by using the experimental flow stress data to depict the flow characteristics of the steel. An excellent correspondence (R = 0.99 and AARE = 5.2 ) between the experimental and predicted flow stress data has been obtained. Further we have predicted the deformation instabilities in the present steel based on

Get Price### Hot Deformation Behavior and Flow Stress Prediction of TC4

Isothermal compression tests of TC4-DT titanium alloy at the deformation temperature ranging from 1181 to 1341 K covering α β phase field and β-phase field the strain rate ranging from 0.01 to 10.0 s-1 and the height reduction of 70 were conducted on a Gleeble-3500 thermo-mechanical simulator. The experimental true stress-true strain data were employed to develop the

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