Experimental and crystal plasticity evaluation of grain size effect on formability of austenitic stainless steel sheets

2019 ◽  
Vol 47 ◽  
pp. 310-323 ◽  
Author(s):  
Omid Amelirad ◽  
Ahmad Assempour
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Size Effect ◽  
Crystal Plasticity ◽  
Grain Size Effect ◽  
Steel Sheets

Grain Size Effect in Sheet Metal Microforming Simulation Adopting Strain Gradient Concept

2007 ◽  
Vol 364-366 ◽  
pp. 1285-1291
Author(s):  
Wing Bun Lee ◽  
Yi Ping Chen ◽  
Suet To
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Sheet Metal ◽  
Crystal Plasticity ◽  
Strain Gradient ◽  
Grain Size Effect ◽  
Active System ◽  
Rate Dependent ◽  
Slip Resistance ◽  
Non Local

A strain gradient dependent crystal plasticity approach is adopted to model the size effect in the microforming process of sheet metal. To take into account the grain size effect in the simulation, the total slip resistance in each active system was assumed to be due to a mixed population of forest obstacles arising from both statistically stored and geometrically necessary dislocations. The non-local crystal plasticity has been established by directly incorporating the above slip resistance into the conventional rate-dependent crystal plasticity and implemented into the Abaqus/Standard FE platform by developing the user subroutine UMAT. The formulation has been recapitulated and followed by presentation of the numerical examples employing both the local and non-local formulation. The comparison of the counterpart simulation results reveals the grain size effect in the microforming process and demonstrates the availability of the code developed.

Influence of Nb Stabilization on the Recovery and Recrystallization Kinetics of a Ferritic Stainless Steel: Consequences on Magnetic Losses

2007 ◽  
Vol 558-559 ◽  
pp. 253-258
Author(s):  
Nicolas Meyer ◽  
Yves Bréchet ◽  
Muriel Véron ◽  
Marc Mantel ◽  
Pierre Emmanuel Dubois ◽  
...  
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Size Effect ◽  
Magnetic Losses ◽  
Grain Size Effect ◽  
Qualitative Interpretation ◽  
Nb Content ◽  
Steel Grades ◽  
Deformed State ◽  
Kinetics Of

Softening kinetics of two 17% chromium (Cr) stainless steel grades that differ in niobium (Nb) content are compared. In the experiments, we observed that a low Nb stabilization makes recrystallization nucleation much faster and prevents incomplete recrystallization. A qualitative interpretation, based on interaction with precipitates, is proposed and explains the main features of the softening kinetics as well as the microstructures obtained. For the Nb stabilized grade, magnetic losses were measured in the deformed state and after recrystallization. Above a specific magnetizing frequency, the deformed state led to smaller losses than the recrystallized state. These results are believed to be attributed to a grain size effect.

Microimprinting Simulation of Anti-Bacterial Pattern on Stainless Steel Sheet

2014 ◽  
Vol 931-932 ◽  
pp. 349-353
Author(s):  
Pramote Koowattanasuchat ◽  
Numpon Mahayotsanun
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Friction Coefficient ◽  
Steel Sheet ◽  
Grain Size Effect ◽  
Stainless Steel Sheet ◽  
Element Analysis ◽  
Steel Sheets ◽  
Grain Sizes ◽  
Simulation Results

The aim of this study was to investigate the effects of important factors in microimprinting, which could be used to create the anti-bacterial pattern on stainless steel sheets. The microimprinting process was modeled and simulated by using finite element analysis (FEA). The following factors were considered: forming steps, forming velocity, grain size, and friction coefficient. The simulation results showed that two-step forming helped reduce peak errors. Increasing forming velocity and friction coefficient tended to increase peak errors. The grain size effect was not noticeable because the selected grain sizes were much larger than that of the micro feature.

Landau-Ginzburg-Devonshire Theory of the Grain Size Effect on the Ferroelectricity in BaTiO 3 Nanoceramics

2020 ◽  
Author(s):  
Kum-Ok Jang ◽  
Il-Hwan Kim ◽  
Il-Hun Kim ◽  
Kye-Ryong Sin ◽  
Chol-Jin Kim
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Grain Size Effect
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