Material model for dynamic recrystallization of Mg–8Al–0.5Zn alloy under uni-axial compressive deformation with variation of forming temperatures

2016 ◽  
Vol 651 ◽  
pp. 1010-1017 ◽  
Author(s):  
Kwanghyun Ahn ◽  
Hye-Jin Lee ◽  
Jonghun Yoon
Keyword(s):  
Dynamic Recrystallization ◽  
Material Model ◽  
Compressive Deformation

Effect of Nb Content on Hot Flow Stress, Dynamic Recrystallization and Strain Accumulation Behaviors in Low Carbon Bainitic Steel

2010 ◽  
Vol 654-656 ◽  
pp. 62-65 ◽  
Author(s):  
Cheng Liang Miao ◽  
Guo Dong Zhang ◽  
Cheng Jia Shang
Keyword(s):  
Dynamic Recrystallization ◽  
Rolling Process ◽  
Carbon Steels ◽  
Compressive Deformation ◽  
Strain Accumulation ◽  
Low Carbon ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Compression Process ◽  
Single Pass

Compressive deformation behaviors of low carbon steels with different Nb contents were investigated in the temperature range 900oC to 1100oC and strain rates from 0.05s-1 to 2s-1 by single pass deformation. Multi-pass compressive deformation processes were also carried out to examine strain accumulation under different Nb contents. In single pass deformations, dynamic recrystallization (DRX) can be observed in the case of low strain rate and high temperature, and the higher Nb steel exhibits higher deformation activation energy (Qdef) and critical strain value (εc) for the onset of DRX. However during multi-pass compression process (interval time of 3-4s), the higher Nb steel has larger strain accumulation between passes, so it is easier for high Nb steel that DRX happens during hot strip rolling process, which starts at relative high rolling temperature.

Dynamic Recrystallization Modeling and Mechanisms in Inconel 690 Alloy during Hot Compressive Deformation

2020 ◽  
Vol 29 (11) ◽  
pp. 7188-7197
Author(s):  
D. S. Li ◽  
X. Y. Shang ◽  
W. Wang ◽  
E. X. Zhao ◽  
G. Chen ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Compressive Deformation ◽  
Inconel 690

EBSD analysis of evolution of dynamic recrystallization grains and δ phase in a nickel-based superalloy during hot compressive deformation

2016 ◽  
Vol 97 ◽  
pp. 13-24 ◽  
Author(s):  
Y.C. Lin ◽  
Dao-Guang He ◽  
Ming-Song Chen ◽  
Xiao-Min Chen ◽  
Chun-Yang Zhao ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Compressive Deformation ◽  
Ebsd Analysis ◽  
Nickel Based Superalloy ◽  
Δ Phase

Deformation Behavior and Dynamic Recrystallization of As-Cast Mg-Y-Nd-Gd-Zr Alloy: A Study with Processing Map

2009 ◽  
Vol 610-613 ◽  
pp. 815-821 ◽  
Author(s):  
Xin Zhao ◽  
Kui Zhang ◽  
Xing Gang Li ◽  
Yong Jun Li ◽  
Kang Zhang ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Processing Map ◽  
Flow Behavior ◽  
Material Model ◽  
Dissipation Factor ◽  
Power Exponent ◽  
Strain Rates ◽  
Mechanical Working ◽  
Dynamic Material Model

The characteristic of dynamic recrystallization (DRX) in Mg-Y-Nd-Gd-Zr magnesium alloy had been investigated by compression test at temperatures between 523 and 723K and the strain rates ranging from 0.002 to 1s-1with maximum strain of 0.693. The flow behavior was described by a power exponent function. Processing map of this alloy was established on the basis of dynamic material model. Microstructure observations suggested that the peak value of dissipation factor was 0.36 at the temperature of 673K and the strain rate of 1s-1. The map exhibits flow instabilities as two domains, one is at the lower temperatures but higher strain rates, and the other is at higher temperatures and lower strains.The region at an intermediate temperature and a high strain rate is the region of the optimal mechanical working properties.

Delamination in the scoring and folding of paperboard

TAPPI Journal ◽  
2012 ◽  
Vol 11 (1) ◽  
pp. 61-66 ◽  
Author(s):  
DOEUNG D. CHOI ◽  
SERGIY A. LAVRYKOV ◽  
BANDARU V. RAMARAO
Keyword(s):  
Finite Element ◽  
Plane Deformation ◽  
Strain Analysis ◽  
Local Strain ◽  
Uniaxial Stress ◽  
Material Model ◽  
Element Model ◽  
Plastic Behavior ◽  
Stress Strain ◽  
Strain Fields

Delamination between layers occurs during the creasing and subsequent folding of paperboard. Delamination is necessary to provide some stiffness properties, but excessive or uncontrolled delamination can weaken the fold, and therefore needs to be controlled. An understanding of the mechanics of delamination is predicated upon the availability of reliable and properly calibrated simulation tools to predict experimental observations. This paper describes a finite element simulation of paper mechanics applied to the scoring and folding of multi-ply carton board. Our goal was to provide an understanding of the mechanics of these operations and the proper models of elastic and plastic behavior of the material that enable us to simulate the deformation and delamination behavior. Our material model accounted for plasticity and sheet anisotropy in the in-plane and z-direction (ZD) dimensions. We used different ZD stress-strain curves during loading and unloading. Material parameters for in-plane deformation were obtained by fitting uniaxial stress-strain data to Ramberg-Osgood plasticity models and the ZD deformation was modeled using a modified power law. Two-dimensional strain fields resulting from loading board typical of a scoring operation were calculated. The strain field was symmetric in the initial stages, but increasing deformation led to asymmetry and heterogeneity. These regions were precursors to delamination and failure. Delamination of the layers occurred in regions of significant shear strain and resulted primarily from the development of large plastic strains. The model predictions were confirmed by experimental observation of the local strain fields using visual microscopy and linear image strain analysis. The finite element model predicted sheet delamination matching the patterns and effects that were observed in experiments.

Sign in / Sign up

Export Citation Format

Share Document