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| tutorials:t15 [2019/08/01 14:40] – [T15: Effect of microstructure and conditions (Part 1)] pwarczok | tutorials:t15 [2023/08/02 22:23] (current) – pwarczok |
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| //This tutorial was tested on\\ | //This tutorial was tested on\\ |
| MatCalc version 6.02 rel 1.003\\ | MatCalc version 6.04 rel 1.001\\ |
| license: free\\ | license: free\\ |
| database: mc_fe.tdb; mc_fe.ddb// | database: mc_fe.tdb; mc_fe.ddb// |
| Create a precipitate phase **CEMENTITE_P0**, using **'Global > Phase status'**. In the **'Nucleation"** tab -> **'Controls'** subtab, change the **'Nucleus composition'** model from **'ortho-equilibrium'** to **'para-equilibrium'** using the drop-down menu. **'Para-equilibrium'** means that the nucleus is assumed to have the same composition in terms of substitutional elements as the matrix from which it forms, and only the carbon is partitioned between the two phases. In the **'ortho-equilibrium'** model, by contrast, the composition of the nucleus is calculated assuming full equilibrium with the BCC_A2 matrix. In the **'Nucleation > Sites'** tab, set the nucleation sites to **'Dislocations'** (remove the tick from 'bulk') | Create a precipitate phase **CEMENTITE_P0**, using **'Global > Phase status'**. In the **'Nucleation"** tab -> **'Controls'** subtab, change the **'Nucleus composition'** model from **'ortho-equilibrium'** to **'para-equilibrium'** using the drop-down menu. **'Para-equilibrium'** means that the nucleus is assumed to have the same composition in terms of substitutional elements as the matrix from which it forms, and only the carbon is partitioned between the two phases. In the **'ortho-equilibrium'** model, by contrast, the composition of the nucleus is calculated assuming full equilibrium with the BCC_A2 matrix. In the **'Nucleation > Sites'** tab, set the nucleation sites to **'Dislocations'** (remove the tick from 'bulk') |
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| {{:tutorials:t15:img:t15_phase_status_2017.png?650| MatCalc phase status}} | {{:tutorials:t15:img:t15_phase_status_6050006.png?650| MatCalc phase status}} |
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| In **'Global > precipitation domains'**, create a new domain named **'ferrite'** with **'BCC_A2'** as its matrix phase. Accept the changes by clicking **'OK'** to close the window. | In **'Global > precipitation domains'**, create a new domain named **'ferrite'** with **'BCC_A2'** as its matrix phase. Accept the changes by clicking **'OK'** to close the window. |
| ''set-simulation-parameter minimum-dfm-for-matrix-compensation=0,25'' | ''set-simulation-parameter minimum-dfm-for-matrix-compensation=0,25'' |
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| Select **'Calc > precipitate kinetics'**. Enter the finish time of the calculation: **'3.6e13'** s (= 1e10 hours). The isothermal treatment temperature should be set to **'600'** and **'Temperature in C'** selected. Leave the other settings as they are, and click on **<nowiki>"Go"</nowiki>**. (The calculation may take some time, especially on slower machines, because of the long treatment time.)\\ | Select **'Calc > Microstructure simulation'**. Enter the finish time of the calculation: **'3.6e13'** s (= 1e10 hours). The isothermal treatment temperature should be set to **'600'** and **'Temperature in C'** selected. Leave the other settings as they are, and click on **<nowiki>"Go"</nowiki>**. (The calculation may take some time, especially on slower machines, because of the long treatment time.)\\ |
| After the calculation has finished, duplicate and lock all the series in the plot window. Return to **'Global > Phase status'** and set the nucleation model for CEMENTITE_P0 to **'ortho-equilibrium'** and re-open **'Calc > precipitation kinetics'**. There is no need to change anything; simply click on **'Go'**. A warning appears that the contents of the current buffer will be overwritten. As the series have been locked, this does not matter; accept the warning with **<nowiki>"Yes"</nowiki>**. | After the calculation has finished, duplicate and lock all the series in the plot window. Return to **'Global > Phase status'** and set the nucleation model for CEMENTITE_P0 to **'ortho-equilibrium'** and re-open **'Calc > precipitation kinetics'**. There is no need to change anything; simply click on **'Go'**. A warning appears that the contents of the current buffer will be overwritten. As the series have been locked, this does not matter; accept the warning with **<nowiki>"Yes"</nowiki>**. |
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