scholarly journals Study on Deformation Characteristics and Microstructure Evolution of 2205/AH36 Bimetal Composite in a Novel Hot Forming Process

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1375
Author(s):  
Zhou Li ◽  
Haibo Xie ◽  
Fanghui Jia ◽  
Yao Lu ◽  
Xiangqian Yuan ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Flow Behavior ◽  
Great Influence ◽  
Hot Forming ◽  
Strain Rates ◽  
Interfacial Zone ◽  
Deformation Characteristics ◽  
Forming Process ◽  
Bending Process ◽  
Bimetal Composite

A new hot forming process of a hot-rolled 2205 duplex stainless/AH36 low-carbon steel bimetal composite (2205/AH36 BC) was proposed in this study, using the Gleeble 3500 thermal-mechanical simulator and hot bending tools. The deformation characteristics of 2205/AH36 BC were studied by hot tensile tests at temperatures from 950 to 1250 °C and strain rates ranging from 0.01 to 1 s−1. The tensile temperature has a great influence on the peak flow stress of the bimetal composite. The main microstructure evolution mechanisms, including dynamic recovery (DRV) and dynamic recrystallization (DRX), changed with the deformation temperatures. The different strain rates and the change of strain rates during the deformation process have an influence on the flow behavior of the bimetal composite. During the hot bending process, qualified parts could be formed successfully without obvious cracks in the interfacial zone. Phase and grain orientation spread (GOS) maps of specimens after hot tensile and forming tests were obtained by the electron backscatter diffraction (EBSD) technique to study the microstructure evolution, respectively. It is found that the effect of the working temperature on microstructure evolution is larger than that of the stacking sequence for 2205/AH36 BC. The considerable geometrically necessary dislocation (GND) accumulation occurs around the interface of 2205/AH36 BC under all imposed working conditions after the hot bending process, due to the interfacial micro-defects and complex stress states.

Flow behavior and microstructure evolution of 7055 aluminum alloy impacted at high strain rates

2016 ◽  
Vol 677 ◽  
pp. 203-210 ◽  
Author(s):  
Shengdan Liu ◽  
Shaoling Wang ◽  
Lingying Ye ◽  
Yunlai Deng ◽  
Xinming Zhang
Keyword(s):  
Aluminum Alloy ◽  
Microstructure Evolution ◽  
High Strain ◽  
Flow Behavior ◽  
Strain Rates ◽  
High Strain Rates ◽  
7055 Aluminum Alloy

Prediction of the Flow Stress of 00Cr17Ni14Mo2 Steel during Hot Deformation

2011 ◽  
Vol 460-461 ◽  
pp. 802-805
Author(s):  
Nan Hai Hao ◽  
Shao Wei Pan
Keyword(s):  
Stainless Steel ◽  
Elevated Temperature ◽  
Flow Stress ◽  
Hot Deformation ◽  
Flow Behavior ◽  
Strain Rates ◽  
Forming Process ◽  
Proposed Model ◽  
316L Austenitic Stainless Steel ◽  
Deformation Tests

The knowledge of the flow behavior of metals during hot deformation is of great importance in determining the optimum forming conditions. In this paper, the flow stress of 00Cr17Ni14Mo2 (ANSI 316L) austenitic stainless steel in elevated temperature is measured with compression deformation tests. The temperatures at which the steel is compressed are 800-1100°C with strain rates of 0.01-1s-1. A mathematical regression model is proposed to describe the flow stress and the validation of the model is conducted also. The proposed model can be used to predict the corresponding flow stress-strain response of 00Cr17Ni14Mo2 stainless steel in elevated temperature for the numerical simulation and design of forming process.

Application of a Material Model to Predict Rolling Forces and Microstructure during a Hot Ring Rolling Process

2013 ◽  
Vol 762 ◽  
pp. 354-359 ◽  
Author(s):  
Thomas Henke ◽  
Gerhard Hirt ◽  
Markus Bambach
Keyword(s):  
Grain Size ◽  
Microstructure Evolution ◽  
Rolling Force ◽  
Flow Behavior ◽  
Rolling Process ◽  
Ring Rolling ◽  
Experimental Investigations ◽  
Forming Process ◽  
Ring Geometry ◽  
Ring Rolling Process

Ring rolling is an incremental bulk forming process. Hence, the process consists of a large number of alternating deformations and dwell steps. For accurate calculations of material flow and thus ring geometry and rolling forces in hot ring rolling processes, it seems necessary to consider material softening due to static and post dynamic recrystallization which could occur between two deformation steps. In addition, due to the large number of cycles, the modeling results, especially the prediction of grain size, can easily be affected by uncertainties in the input data. However, for small rings and ring material with slow recrystallization kinetics, the interpass times can be short compared to the softening kinetics and the effect of softening can be so small, that microstructure evolution and the description of the materials flow behavior can be de-coupled. In this paper, a semi-empirical JMAK-based model for a stainless steel (1.4301/ X5CrNi18-9/ AISI304) is presented and evaluated by the use of experiments and other investigations published in [1],[2]. Finite Element (FE) simulations of a ring rolling process with a high number of ring revolutions and thus multiple, incremental forming steps were conducted based on ring rolling experiments. The FE simulation results were validated with the experimentally derived rolling force and evolution of ring diameter. The microstructure evolution was calculated in a post processing step considering the investigated evolution of strain and temperature. In this calculation the interrelations between the fraction of dynamically recrystallized microstructure, the evolution of post-dynamically recrystallized microstructure and the final grain size have been considered. Both, the calculated final microstructure and the evolution of rolling force and ring geometry calculated stand in good agreement with the experimental investigations.

Unified modeling of flow behavior and microstructure evolution in hot forming of a Ni-based superalloy

2016 ◽  
Vol 662 ◽  
pp. 54-64 ◽  
Author(s):  
Xuefeng Tang ◽  
Baoyu Wang ◽  
Yuanming Huo ◽  
Wenyu Ma ◽  
Jing Zhou ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Flow Behavior ◽  
Hot Forming ◽  
Unified Modeling

Microstructure Evolution and Constitutive Modeling Based on Flow Behavior of 2297 Al-Cu-Li Alloy

2016 ◽  
Vol 850 ◽  
pp. 208-218 ◽  
Author(s):  
Sheng Li Yang ◽  
Jian Shen ◽  
Xi Wu Li ◽  
Xiao Dong Yan ◽  
Bai Ping Mao
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Microstructure Evolution ◽  
Constitutive Equations ◽  
Work Hardening ◽  
Deformation Temperature ◽  
Flow Behavior ◽  
Great Influence ◽  
Deformation Condition ◽  
Steady Stage

Flow behavior and microstructure evolution of 2297 Al-Cu-Li alloy were investigated by isothermal compression tests conducted at the deformation temperature of 300-500°C and strain rates of 0.001-10s-1. The results demonstrate that the characteristics of stress-strain curves depended on the interaction of work hardening and dynamic softening. The true stress increased with the decreasing of temperature and the increasing of the strain rate. At a given deformation condition, the flow curve consisted of three stages: stage I (work hardening stage), stage II (softening stage) and stage III (steady stage). Deformation temperature and strain rate had a great influence on microstructure evolution. 2297 alloy deformed at low temperature (300°C) and high strain rate (10s-1) showed a DRV characteristic. As deformed at high temperature (500°C) and low strain rate (0.001s-1), DRX gradually become the main softening mechanism. The measured flow stress was friction corrected and then employed to develop constitutive equations on the basis of the Arrhenius-type equation by considering the effect of the strain on material constants by a sixth orders polynomials. Flow stress value of 2297 alloy predicted by the proposed constitutive equations shows a good agreement with experimental results, thereby confirming the validity of the developed constitutive relation.

scholarly journals Hot Forming Process Analysis of Ti6Al-4V Alloy: Experiment, Behaviour Modelling and Finite Element Simulation

2016 ◽  
Vol 838-839 ◽  
pp. 183-189 ◽  
Author(s):  
Vincent Velay ◽  
Hiroaki Matsumoto ◽  
Vanessa Vidal ◽  
Luc Penazzi ◽  
Fabien Nazaret ◽  
...  
Keyword(s):  
Finite Element ◽  
Process Analysis ◽  
Hot Forming ◽  
Strain Rates ◽  
Micro Structure ◽  
Forming Process ◽  
Identification Procedure ◽  
Element Simulation ◽  
Deforma Tion ◽  
Finite Element Calculations

The present investigation aims at evaluating and understanding the thermo-mechanical be-haviour of a titanium alloy under hot forming conditions. In this work, several considerations are ad-dressed. First, Scanning Electron Microscopy observations are performed to assess the evolutions of(α − β) phases, grain size, defects regarding the thermo-mechanical loadings from different static anddynamic tests (various temperatures and strain rates). Hence, the relationships between mechanicalproperties and micro-structure evolutions in such conditions allow a first assessment of the deforma-tion mechanisms in link with the macroscopic stress-strain curves. Afterwards, a behaviour modelformulation associated to an identification procedure of the parameters of the constitutive equationsis proposed. Finally, several tests performed under hot forming conditions and conducted on an in-dustrial press are compared to Finite Element calculations. Results are compared and provide someinteresting improvement ways in order to investigate the influence of the process parameters on thefinal shape of the part.

Microstructure Evolution and Control of 30Cr2Ni4MoV Steel During Hot Forming

2011 ◽  
Vol 317-319 ◽  
pp. 170-173 ◽  
Author(s):  
Xiao Xun Zhang ◽  
Yun Hua Sun ◽  
Ye Ling Zhu
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Process Parameters ◽  
Microstructure Evolution ◽  
Hot Forming ◽  
Forming Process ◽  
Industry Practice ◽  
Prediction And Control ◽  
3D Software ◽  
And Control

Prediction and control of the microstructure to improve product performance are very important for the industry practice. In this study, microstructure evolutions of 30Cr2Ni4MoV steel under different conditions were simulated by changing the process parameters using the Deform 3D software. Effects of the forming process parameters on the microstructure were revealed: (1) the higher the temperature and the lower the strain rate, the smaller the strain are needed for the dynamic recrystallization; (2) when strain is enough, the higher the strain rate, the easier the uniform and small grain size can be obtained; (3) under a certain strain rate, the grain size increases as the deformation temperature increases. The microstructure of metal can be predicted and controlled according to the effects of hot forming process parameters on the microstructure evolution.

HOT WORKABILITY DURING SUBTRANSUS DEFORMATION AT HIGHER STRAIN RATES OF TC11 ALLOY WITH WIDMANSTĂTTEN MICROSTRUCTURE

2009 ◽  
Vol 23 (06n07) ◽  
pp. 875-880 ◽  
Author(s):  
HONGWU SONG ◽  
SHIHONG ZHANG ◽  
MING CHENG ◽  
FEI MEN ◽  
CHUNLING BAO
Keyword(s):  
Microstructure Evolution ◽  
Flow Behavior ◽  
Peak Stress ◽  
Superplastic Forming ◽  
Processing Parameters ◽  
Stress Axis ◽  
Strain Rates ◽  
Hot Workability ◽  
Compression Tests ◽  
Working Parameters

The effect of processing parameters on hot workability and microstructure evolution during subtransus deformation of TC11 alloy with widmanstăten microstructure was studied using isothermal compression tests. Testing was conducted at strain rates of 0.1-10s-1, temperature ranges 920-980°C and height reductions of 30-70%. The influence of hot working parameters on flow behavior, hot workability and microstructure evolution was systemically investigated. The results showed that all the flow curves exhibited a peak stress at very low strains (<0.1) followed by extensive flow softening. Surface fracture, cavitations and localized shear flow were found to be main factors that limited the hot workability of TC11 alloy. At low strains, lamellar kinking started to occur due to the orientation between the colony α lamellar and stress axis. With deformation continues, reorientation of the lamellar colony occurred and the deformed lamellar became elongated and thinner. At high stains, segmentation and globularization of α lamellar took place to produce a refined microstructure with α grain size around 1 µm that is technologically desirable for secondary processes such as superplastic forming. A microstructure mechanism map based on the previous results was then established and applied to process design considering defect and microstructure control.

Defect Analysis of Cup-Shaped Aluminum Alloy Forgings with Flange

2010 ◽  
Vol 154-155 ◽  
pp. 349-354
Author(s):  
Hong Bo Dong ◽  
Gao Chao Wang
Keyword(s):  
Aluminum Alloy ◽  
Flow Behavior ◽  
Metal Flow ◽  
Great Influence ◽  
Forming Process ◽  
Size And Shape ◽  
Mould Design ◽  
Extrusion Forming ◽  
Forming Defects ◽  
Experimental Researches

Effect of the size and shape of cup shaped forgings with flange on forming capability of aluminum alloy was investigated. The numerical simulation was carried out on the extrusion forming process for each part using two-dimensional elastoplastic finite element method. The metal flow behavior was analyzed, and the forming defects were predicted. Meanwhile, the corresponding experimental researches were conducted. The results show that the forming defects like folding or crack appear in each aluminum alloy forging. The size and shape of cup shaped parts have a great influence on the type and size of forming defects. Good agreement is found between the numerical results and experimental work. The results present important references for technology analysis and mould design.

Sign in / Sign up

Export Citation Format

Share Document