Numerical Simulation of the Four-Roll Bending Process for 2.25Cr-1Mo-0.25V Thick-Plate at Elevated Temperature

2017 ◽  
Author(s):  
Yafei Wang ◽  
Guangxu Cheng ◽  
Zaoxiao Zhang ◽  
Yun Li ◽  
Jianxiao Zhang
Keyword(s):  
Numerical Simulation ◽  
Elevated Temperature ◽  
Plate Thickness ◽  
Strain Curve ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Plate Bending ◽  
Stress Strain ◽  
Explicit Finite Element ◽  
Bending Process

In this paper, the four-roll plate bending process of 2.25Cr-1Mo-0.25V steel at elevated temperature is investigated by numerical simulation. This 3-D simulation is finished by using the elastic-plastic dynamic explicit finite element method (FEM) under the ANSYS/LS-DYNA environment. The strain softening behavior of 2.25Cr-1Mo-0.25V steel at elevated temperature is presented and discussed. The stress-strain relationship of the steel plate is modeled using a piecewise linear material model, with the stress-strain curve obtained through tensile tests. The plate bending process with a plate thickness of 150 mm is investigated. The amount and position of maximum plastic deformation are analyzed. The present study provides an important basis for the optimization of bending parameters and further investigation of the effect of high-temperature deformation on the resistance to hydrogen attack of 2.25Cr-1Mo-0.25V steel.

High-Temperature Deformation Characteristics of a SA516GR70 Vessel Steel

2013 ◽  
Vol 652-654 ◽  
pp. 1471-1477
Author(s):  
Zhen Yi Huang ◽  
Fu Qiang Chen ◽  
Ping Wang
Keyword(s):  
Flow Stress ◽  
Dynamic Recrystallization ◽  
Work Hardening ◽  
Volume Fraction ◽  
Strain Curve ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Strain Rates ◽  
Stress Strain ◽  
Vessel Steel

The single-directional and single-pass compression test were conducted on SA516GR70 vessel steel by a Gleeble-3500 thermal-mechanical simulator with the parameters of 800-1100 oC and 0.01-5 s-1. The influence of deformation temperatures and strain rates on the flow stress and the evolution of dynamic recrystallization of the observed steel were investigated. The results showed that the work hardening, dynamic recovery and dynamic recrystallization softening processes might be occurred successively or simultaneously with the strain increasing. The flow stress-strain curves for the compressed steel can be divided into work hardening stage, transition stage, softening stage and steady-state stage. The dynamic recrystallization occurred in the deformation samples when the observed steel was compressed at above temperatures and strain rates. At a certain deformation temperature, increasing the strain rates was helpful to increase the volume fraction of the dynamic recrystallization and to refine the grains. At a certain strain rate, decreasing the deformation temperatures was helpful to refine and homogenize the macrostructures. The deformation activation energy was 377 kJ/mol and the equation of hot deformation was built by analysing stress-strain curve of SA516GR70 steel.

Numerical Simulation of Plate Bender Bending Process

2011 ◽  
Vol 189-193 ◽  
pp. 2228-2232
Author(s):  
Xue Jiang Liu ◽  
Hai Sheng Liu ◽  
Jing Liu ◽  
Hui Gang Wang
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Mechanical Behavior ◽  
Process Optimization ◽  
Plate Bending ◽  
Bending Process

The plate’s mechanical behavior of three-roller plate bending machine had been analyzed in case of upper roller feeding based on ANSYS. Strain and stress distribution of the plate and its changes are gained. The influence of upper roller’s feeding location and bending velocity to bending process are researched. The results are valuable to bending process optimization and practical technique of plate bending.

Development of the External Pressure Charts for 2¼Cr-1Mo and Mod.9Cr-1Mo Steel at Elevated Temperature Design

2019 ◽  
Author(s):  
Masanori Ando ◽  
Satoshi Okajima ◽  
Kazumichi Imo
Keyword(s):  
Elevated Temperature ◽  
Fast Reactor ◽  
Strain Curve ◽  
External Pressure ◽  
Stress Strain ◽  
Part D ◽  
Elevated Temperature Design ◽  
Minimum Stress ◽  
Design Yield ◽  
Strain Equation

Abstract For the required thickness estimation against buckling in the elevated temperature design, the external pressure chart for two kinds of ferritic steel, 2 1/4Cr-1Mo and Mod.9Cr-1Mo steel, was developed. On the basis of the guideline described in the ASME BPVC Section II, Part D, Mandatory Appendix 3 with mechanical and physical properties provided in the JSME fast reactor code, the external pressure charts for each material were constructed. The minimum stress-strain curve for evaluating the external pressure chart was applied the stress-strain equation with design yield strength, Sy, provided by the JSME fast reactor code. As a result, three external pressure charts with digital values were proposed for elevated temperature design. Moreover, the rationalization effect from the current alternative was evaluated by the sample problem. This proposal resolves two issues. One is alternative use of chart for lower strength material over the 150 °C. The other is the external pressure chart above 480°C for which ferritic steels are not available.

Constitutive Analysis and Microstructure Evolution of the High-Temperature Deformation Behavior of an Advanced Intermetallic Multi-Phase γ-TiAl-Based Alloy

2014 ◽  
Vol 922 ◽  
pp. 807-812 ◽  
Author(s):  
Robert Werner ◽  
Emanuel Schwaighofer ◽  
Martin Schloffer ◽  
Helmut Clemens ◽  
Janny Lindemann ◽  
...  
Keyword(s):  
High Temperature ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Thermomechanical Processing ◽  
True Strain ◽  
Strain Curve ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Nominal Composition ◽  
Compression Tests

In the present study the high-temperature deformation behavior of a caste and subsequently HIPed β-solidifying γ-TiAl-based alloy with a nominal composition of Ti-43.5Al-4Nb-1Mo-0.1B (in at. %), termed TNM alloy, is investigated. At room temperature this alloy consists of ordered γ-TiAl, α2-Ti3Al and βo-TiAl phases. By increasing the temperature, α2and βodisorder to α and β, respectively. In order to get a better understanding of dynamic recovery and recrystallization processes during thermomechanical processing, isothermal compression tests on TNM specimens are carried out on a Gleeble®3500 simulator. These tests are conducted at temperatures ranging from 1100 °C to 1250 °C (in the α/α2+β/βo+γ phase field region) applying strain rates in the range of 0.005 s-1to 0.5 s-1up to a true strain of 0.9. The evolution of microstructure along with the dynamically recrystallized grain size during hot deformation is examined by scanning electron microscopy (SEM). The flow softening behavior after reaching the peak stress in the true stress-true strain curve is attributed to dynamic recrystallization. By using the Zener-Hollomon parameter as a temperature-compensated strain rate the dependence of flow stress on temperature and strain rate is shown to follow a hyperbolic-sine Arrhenius-type relationship.

Orientation Dependence of Dynamic Recrystallization Behavior of Al Single Crystals

2004 ◽  
Vol 449-452 ◽  
pp. 31-36
Author(s):  
Yasuhiro Miura ◽  
Kentaro Ihara
Keyword(s):  
Dynamic Recrystallization ◽  
Single Crystals ◽  
Orientation Dependence ◽  
Crystallographic Analysis ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Stress Strain ◽  
Strain Behavior ◽  
The Matrix ◽  
Dynamic Recrystallization Behavior

An experimental study on the microstructure development and stress–strain behavior during high temperature deformation of aluminum (Al) single crystals was made by using X-ray Laue technique and the electron backscatter pattern (EBSP) technique. The main purpose was to clarify the process of dynamic recrystallization (DRX). The measured stress-strain curves with large stress peaks and the new Laue spots without streaks at around the stress peaks confirmed the occurrence of DRX in Al single crystals with initial compression axis <111>, <011> or <001>. Crystallographic analysis by the Laue technique and EBSP technique show that the DRX grain and the matrix have an <121> axis in common in the <111> crystal, an <101> axsis in the <011> and <001> crystals. For the <111> crystal, the unrecrystallized region near the DRX grain consists of subgrains adjoined each other with <112> tilt boundaries and the size of subgrains becomes smaller and the misfit at subgrain boundaries becomes larger as the DRX grain boundaries are approached. These results suggest that DRX grains are nucleated through the development of subgrains.

Application of the VPSC Model to the Description of the Stress–Strain Response and Texture Evolution in AZ31 Mg for Various Strain Paths

2015 ◽  
Vol 137 (4) ◽  
Author(s):  
Nitin Chandola ◽  
Raja K. Mishra ◽  
Oana Cazacu
Keyword(s):  
Mechanical Response ◽  
Mechanical Test ◽  
Texture Evolution ◽  
Mean Field ◽  
Strain Curve ◽  
Temperature Deformation ◽  
Strain Response ◽  
Stress Strain ◽  
Self Consistent ◽  
Strain Paths

Accurate description of the mechanical response of AZ31 Mg requires consideration of its strong anisotropy both at the single crystal and polycrystal levels, and its evolution with accumulated plastic deformation. In this paper, a self-consistent mean field crystal plasticity model, viscoplastic self-consistent (VPSC), is used for modeling the room-temperature deformation of AZ31 Mg. A step-by-step procedure to calibrate the material parameters based on simple tensile and compressive mechanical test data is outlined. It is shown that the model predicts with great accuracy both the macroscopic stress–strain response and the evolving texture for these strain paths used for calibration. The stress–strain response and texture evolution for loading paths that were not used for calibration, including off-axis uniaxial loadings and simple shear, are also well described. In particular, VPSC model predicts that for uniaxial tension along the through-thickness direction, the stress–strain curve should have a sigmoidal shape.

Numerical simulation of the stress–strain curve of duplex weathering steel

2008 ◽  
Vol 29 (2) ◽  
pp. 562-567 ◽  
Author(s):  
Bo Liao ◽  
ChunLing Zhang ◽  
Jing Wu ◽  
Dayong Cai ◽  
Chunmei Zhao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Strain Curve ◽  
Weathering Steel ◽  
Stress Strain Curve ◽  
Stress Strain

Multi-Scale Numerical Simulation of H62 Brass for Hot-Extrusion Process

2010 ◽  
Vol 97-101 ◽  
pp. 2880-2885
Author(s):  
Yan Hong Xiao ◽  
Chen Guo ◽  
Xiao Kang Tian
Keyword(s):  
Numerical Simulation ◽  
Process Parameters ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Influence Of Process Parameters ◽  
Multi Scale ◽  
Microstructure Prediction ◽  
Sine Functions

Thermal deformation process of H62 brass is studied, multi-scale simulations of macro-forming property and microstructure distribution are carried out for the hot-extrusion process of double cups part with flange utilizing numerical simulation technology, the process parameters are determined and the microstructure of extruded parts is predicted. The constitutive equation of H62 brass under high temperature deformation is established with isothermal compression test, and the results indicate that the flow stress accords to Arrhenius hyperbolic sine functions. The model of microstructure evolution during hot-deformation is founded and the influence of process parameters on microstructure is revealed. The microstructure prediction on extruded part shows that the simulated results agree well with the experimental results. The high-quality products are obtained using the optimal process parameters.

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