Multiscale Modeling of the Effect of Very Large Strain on the Microstructure Evolution and Ductility of Microalloyed Steels

2014 ◽  
pp. 121-141
Author(s):  
Krzysztof Muszka ◽  
Janusz Majta
Keyword(s):  
Multiscale Modeling ◽  
Microstructure Evolution ◽  
Large Strain ◽  
Microalloyed Steels

Strength and Microstructure Evolution in Nickel during Large Strain Wire Drawing

2021 ◽  
pp. 117396
Author(s):  
Abhinav Arya ◽  
Satyam Suwas ◽  
Céline Gérard ◽  
Loïc Signor ◽  
Ludovic Thilly ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Large Strain ◽  
Wire Drawing

Static recrystallization kinetics and microstructure evolution of 7055 aluminum alloy

2019 ◽  
Vol 116 (1) ◽  
pp. 120
Author(s):  
Tao Zhang ◽  
Lei Li ◽  
Shihong Lu ◽  
Zhengfang Li ◽  
Peng Chen ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Flow Stress ◽  
Microstructure Evolution ◽  
Static Recrystallization ◽  
Large Strain ◽  
Processing Parameters ◽  
Temperature Sensitive ◽  
Sensitive Material ◽  
Interval Time ◽  
7055 Aluminum Alloy

In order to acquire flow characteristics in multi-pass hot plastic deformation and the optimized processing parameters for 7055 aluminum alloy, the double-pass hot compressive flow stress behavior was studied at the temperatures from 300 to 420 °C, the strain from 0.2 to 0.4 and the pass interval time from 10 to 100s on Gleeble-3180 thermo-simulation machine. The static recrystallization (SRX) kinetics and grain size model of 7055 aluminum alloy were acquired by regression analysis. The metallographic tests were conducted and the effects of pass interval time, temperature and strain on microstructure evolution of SRX were analyzed. The results show that 7055 aluminum alloy is temperature sensitive material and the yield flow stress decreases with ascending temperature and pass interval time. Large strain, high temperature and long pass interval time are beneficial to larger SRX fraction and grain refinement. The investigation of flow characteristic and microstructure evolution can be a guidance to acquire optimized processing parameters for multi-pass hot deformation of 7055 aluminum alloy.

Multiscale Modeling and Simulation of Crystal Plasticity Based on Dislocation Patterning in Polycrystal

2007 ◽  
Vol 340-341 ◽  
pp. 205-210 ◽  
Author(s):  
Naoshi Yamaki ◽  
Yoshiteru Aoyagi ◽  
Kazuyuki Shizawa
Keyword(s):  
Modeling And Simulation ◽  
Multiscale Modeling ◽  
Crystal Plasticity ◽  
Stress Condition ◽  
Diffusion Theory ◽  
Large Strain ◽  
Cell Structure ◽  
Reaction Diffusion ◽  
Multiscale Model ◽  
Stress Effect

A multiscale model on dislocation patterning of cell structure and subgrain for polycrystal is newly developed on the basis of reaction-diffusion theory. A FD simulation for dislocation patterning and a FE one for crystal deformation are simultaneously carried out for a FCC polycrystal at large strain. Reflecting stress value on stress-effect coefficients, it is numerically predicted that the evolution of dislocation pattern in a polycrystal is different in response to the stress condition of each grain.

Microstructure Evolution during Warm Deformation of Low Carbon Steel with Dispersed Cementite

2007 ◽  
Vol 558-559 ◽  
pp. 505-510 ◽  
Author(s):  
J. Gallego ◽  
Alberto Moreira Jorge ◽  
O. Balancin
Keyword(s):  
Microstructure Evolution ◽  
Large Strain ◽  
Cell Structure ◽  
Lath Martensite ◽  
Low Carbon Steel ◽  
Testing Temperature ◽  
Equivalent Strain ◽  
Low Carbon ◽  
Ultrafine Grained ◽  
Ebsd Technique

The microstructure evolution and mechanical behavior during large strain of a 0.16%CMn steel has been investigated by warm torsion tests. These experiments were carried out at 685 °C at equivalent strain rate of 0.1 s-1. The initial microstructure composed of a martensite matrix with uniformly dispersed fine cementite particles was attained by quenching and tempering. The microstructure evolution during tempering and straining was performed through interrupted tests. As the material was reheated to testing temperature, well-defined cell structure was created and subgrains within lath martensite were observed by TEM; strong recovery took place, decreasing the dislocation density. After 1 hour at the test temperature and without straining, EBSD technique showed the formation of new grains. The flow stress curves measured had a peculiar shape: rapid work hardening to a hump, followed by an extensive flow-softening region. 65% of the boundaries observed in the sample strained to ε = 1.0 were high angle grain boundaries. After straining to ε = 5.0, average ferrite grain size close to 1.5 1m was found, suggesting that dynamic recrystallization took place. Also, two sets of cementite particles were observed: large particles aligned with straining direction and smaller particles more uniformly dispersed. The fragmentation or grain subdivision that occurred during reheating and tempering time was essential for the formation of ultrafine grained microstructure.

scholarly journals Conventional and Multiscale Modeling of Microstructure Evolution During Laminar Cooling of DP Steel Strips

2014 ◽  
Vol 45 (13) ◽  
pp. 5835-5851 ◽  
Author(s):  
Maciej Pietrzyk ◽  
Jan Kusiak ◽  
Roman Kuziak ◽  
Łukasz Madej ◽  
Danuta Szeliga ◽  
...  
Keyword(s):  
Multiscale Modeling ◽  
Microstructure Evolution ◽  
Laminar Cooling ◽  
Dp Steel ◽  
Steel Strips

Strain hardening regimes and microstructure evolution during large strain compression of high purity titanium

2002 ◽  
Vol 46 (6) ◽  
pp. 419-423 ◽  
Author(s):  
Ayman A Salem ◽  
Surya R Kalidindi ◽  
Roger D Doherty
Keyword(s):  
Strain Hardening ◽  
Microstructure Evolution ◽  
High Purity ◽  
Large Strain ◽  
Purity Titanium
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