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| tutorials:t20 [2019/08/13 17:58] – [T20: Simulating grain growth] pwarczok | tutorials:t20 [2023/08/18 13:37] – [Grain growth of pure Fe-matrix] pwarczok |
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| //This tutorial was tested on\\ | //This tutorial was tested on\\ |
| MatCalc version 6.02 rel 1.003\\ | MatCalc version 6.03 rel 1.000\\ |
| license: free\\ | license: free\\ |
| database: mc_fe.tdb; mc_fe.ddb// | database: mc_fe.tdb; mc_fe.ddb// |
| Next, in the **'MS Evolution'** tab select the **'Grainstructure'** sub-tab. By default, the evolution model for grain size is set to **'None - no evolution'**. This is the option that has been used in all kinetic simulations so far; the grain size, as well as other microstructural parameters such as dislocation density, has been taken as constant. Instead, set this to **'Single class model'**. A set of options will appear as shown in the diagram below. Leave the values with default settings and click on 'OK' button. | Next, in the **'MS Evolution'** tab select the **'Grainstructure'** sub-tab. By default, the evolution model for grain size is set to **'None - no evolution'**. This is the option that has been used in all kinetic simulations so far; the grain size, as well as other microstructural parameters such as dislocation density, has been taken as constant. Instead, set this to **'Single class model'**. A set of options will appear as shown in the diagram below. Leave the values with default settings and click on 'OK' button. |
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| {{:tutorials:t20:img:t20_precipitation_domains_msevol_grainstructure_6011003.png?650|}} | {{:tutorials:t20:img:t20_precipitation_domains_msevol_grainstructure_6050006.png?650|}} |
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| Using **Calc > precipitation kinetics**, set up an isothermal simulation with an end-time of 3600 s (1 hour) and a temperature of 900°C. Click on **'Go'**. The simulation will be over very rapidly compared to precipitation simulations. | Using **'Calc' -> 'Microstructure simulation'**, set up an isothermal simulation with an end-time of 3600 s (1 hour) and a temperature of 900°C. Click on **'Go'**. The simulation will be over very rapidly compared to precipitation simulations. |
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| Create a plot of type 'p1'. In the **'variables'** window, find the section entitled **'prec domain struct sc'** ('sc' standing for 'single class') and expand to show **GD$***-variables. Expand this one step further to show **GD$austenite**, and drag this to the plot window. Change the (default x-axis label to read **time [h]** and modify the scaling factor to **1/3600**. Change the y-axis title to **Grain diameter [μm]** and modify the scaling factor to **1e6**. | Create a plot of type 'p1'. In the **'variables'** window, find the section entitled **'prec domain struct sc'** ('sc' standing for 'single class') and expand to show **GD$***-variables. Expand this one step further to show **GD$austenite**, and drag this to the plot window. Change the (default x-axis label to read **time [h]** and modify the scaling factor to **1/3600**. Change the y-axis title to **Grain diameter [μm]** and modify the scaling factor to **1e6**. |
| The final simulation demonstrates the effect of the precipitates on the grain growth. In order to account for this effect. a precipitate phase needs to be defined which will appear in the simulation. In the **'Phase status'** window, create the precipitate phase for **'FCC_A1#01'** phase, and select the dislocations as nucleation sites (in **'nucleation'** tab). | The final simulation demonstrates the effect of the precipitates on the grain growth. In order to account for this effect. a precipitate phase needs to be defined which will appear in the simulation. In the **'Phase status'** window, create the precipitate phase for **'FCC_A1#01'** phase, and select the dislocations as nucleation sites (in **'nucleation'** tab). |
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| {{:tutorials:t20:img:t20_nbc_nucleation_sites_6011003.png?650|}} | {{:tutorials:t20:img:t20_nbc_nucleation_sites_6050006.png?650|}} |
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| Once again, setup the isothermal simulation for 3600 s at 900°C and plot the grain diameter of austenite when the calculation is completed. | Once again, setup the isothermal simulation for 3600 s at 900°C and plot the grain diameter of austenite when the calculation is completed. |
