T21: Strain induced precipitates
 
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tutorials:t21 [2019/08/13 18:39] – [T21: Strain induced precipitates] pwarczoktutorials:t21 [2023/08/18 13:36] (current) – [T21: Strain induced precipitates] 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 1.002\\
 license: free\\ license: free\\
 database: mc_fe.tdb; mc_fe.ddb// database: mc_fe.tdb; mc_fe.ddb//
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 The phase fractions can be plotted by calling the appropriate user-defined window. In **'View'** -> **'Create new window'**, select the 'user defined' tab. There, select '01_all_phase_fractions over T_celsius_logY' and click on 'OK'.  The phase fractions can be plotted by calling the appropriate user-defined window. In **'View'** -> **'Create new window'**, select the 'user defined' tab. There, select '01_all_phase_fractions over T_celsius_logY' and click on 'OK'. 
  
-{{:tutorials:t21:img:t21_user_defined_equilib_2017.png| MatCalc plot}}+{{:tutorials:t21:img:t21_user_defined_equilib_6050006.png| MatCalc plot}}
  
 This will result in the plot looking like the one shown below. From this diagram it can be concluded that NbC precipitates below 1300°C and the ferrite will form below 850°C. This will result in the plot looking like the one shown below. From this diagram it can be concluded that NbC precipitates below 1300°C and the ferrite will form below 850°C.
 +
 {{:tutorials:t21:img:t21_equilib_phase_fractions.png| MatCalc plot}} {{:tutorials:t21:img:t21_equilib_phase_fractions.png| MatCalc plot}}
  
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 Now, define the precipitate phase settings in **'Phase status'** window. Select **'FCC_A1#01'** and click on **'Create'** and **'precipitate (_Pnn'**). In 'Nucleation' -> 'Sites' set 'dislocations' as nucleation sites (and remove the checkmark from 'bulk'). Now, define the precipitate phase settings in **'Phase status'** window. Select **'FCC_A1#01'** and click on **'Create'** and **'precipitate (_Pnn'**). In 'Nucleation' -> 'Sites' set 'dislocations' as nucleation sites (and remove the checkmark from 'bulk').
  
-{{:tutorials:t21:img:t21_nbc_austen_initial_set_6011003.png?650| MatCalc plot}}+{{:tutorials:t21:img:t21_nbc_austen_initial_set_6050006.png?650| MatCalc plot}}
  
 ==== Thermo-mechanical treatment ==== ==== Thermo-mechanical treatment ====
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 The last step before the initial kinetics simulation is the definition of the thermo-mehanical treatment. In **'Global'** -> **'Thermo-mech. treatments ...'** create a new treatment with the name **'cooling'**. Next, create a segment in which the austenite domain will be cooled from **1300°C** to **750°C** with **1°C/s** cooling rate  The last step before the initial kinetics simulation is the definition of the thermo-mehanical treatment. In **'Global'** -> **'Thermo-mech. treatments ...'** create a new treatment with the name **'cooling'**. Next, create a segment in which the austenite domain will be cooled from **1300°C** to **750°C** with **1°C/s** cooling rate 
  
-{{:tutorials:t21:img:t21_cooling_segment.png?650| MatCalc plot}}+{{:tutorials:t21:img:t21_cooling_segment_6050006.png?650| MatCalc plot}}
  
-{{:tutorials:t21:img:t21_cooling_treatment_6011003.png?650| MatCalc plot}}+{{:tutorials:t21:img:t21_cooling_treatment_6050006.png?650| MatCalc plot}}
  
 =====  Kinetics simulation of simple cooling process ===== =====  Kinetics simulation of simple cooling process =====
  
-With all the setup procedures done, perform the kinetics simulation. Click on **'Calc' -> 'Precipitation kinetics'**. Select the **'cooling'** treatment in the **'Temperature control ...'** area and click on **'Go'**.+With all the setup procedures done, perform the kinetics simulation. Click on **'Calc' -> 'Microstructure simulation'**. Select the **'cooling'** treatment in the **'Temperature control ...'** area and click on **'Go'**.
  
-{{:tutorials:t21:img:t21_prec_kin_settings.png| MatCalc plot}}+{{:tutorials:t21:img:t21_microstruct_evol_settings_6050006.png| MatCalc plot}}
  
 Once the calculation is completed, use the 'user defined plots' for visualizing the phase fraction, number density and mean radius evolution of the precipitates, as well as the temperature profile. Click on **'View' -> 'Create new window'**, select the **'user-defined'** tab and choose the entry **'03_kinetics_4_frames_T_f_n_r_linX'**. Click on **'OK'**. Set the start of the scaling range to **'1'**.  The analysis of the created plots reveals a somewhat unspectacular precipitaition of NbC phase after 200 s (below 1100°C) that reaches the number density of 1e18 m<sup>-3</sup> and stays in the nanometer range. Once the calculation is completed, use the 'user defined plots' for visualizing the phase fraction, number density and mean radius evolution of the precipitates, as well as the temperature profile. Click on **'View' -> 'Create new window'**, select the **'user-defined'** tab and choose the entry **'03_kinetics_4_frames_T_f_n_r_linX'**. Click on **'OK'**. Set the start of the scaling range to **'1'**.  The analysis of the created plots reveals a somewhat unspectacular precipitaition of NbC phase after 200 s (below 1100°C) that reaches the number density of 1e18 m<sup>-3</sup> and stays in the nanometer range.
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 Next, in **'Nucleation' -> 'Controls'** tab put a checkmark at the **'use volumetric misfit'** for the precipitate phase. Next, in **'Nucleation' -> 'Controls'** tab put a checkmark at the **'use volumetric misfit'** for the precipitate phase.
  
-{{:tutorials:t21:img:t21_vol_misfit_nucl_2017.png?650| MatCalc plot}}+{{:tutorials:t21:img:t21_vol_misfit_nucl_6050006.png?650| MatCalc plot}}
  
 Click on 'OK' to close the window. Create a new buffer with the name **'Vol_misfit'**. With this buffer selected, perform again the kinetic simulation. Once the simulation is completed, duplicate and lock all series in the plots, then switch the displayed buffer to 'Vol_misfit'. As it can be noticed, the definition of the volumetric misfit decreased amount of the precipitated phase. Click on 'OK' to close the window. Create a new buffer with the name **'Vol_misfit'**. With this buffer selected, perform again the kinetic simulation. Once the simulation is completed, duplicate and lock all series in the plots, then switch the displayed buffer to 'Vol_misfit'. As it can be noticed, the definition of the volumetric misfit decreased amount of the precipitated phase.
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 You might notice some parameters in the 'Dislocation generation and anihilation ...' section which describe the generation of the dislocations (**'A'**-parameter) and their anihilation during the static (**'B'**-parameter, expressed as a conditional expression) and dynamic recovery (**'C'**-parameter). Leave all the parameters there on the default value. You might notice some parameters in the 'Dislocation generation and anihilation ...' section which describe the generation of the dislocations (**'A'**-parameter) and their anihilation during the static (**'B'**-parameter, expressed as a conditional expression) and dynamic recovery (**'C'**-parameter). Leave all the parameters there on the default value.
  
-{{:tutorials:t21:img:t21_sub_model_parameters_6021003.png?650}}+{{:tutorials:t21:img:t21_sub_model_parameters_6050006.png?650}}
  
  
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 In this simulation, three deformation runs will be represented. Click on **'Global' -> 'Thermo-mech. treatments'**, select **'cooling'** treatment and click on **'Duplicate'** button at the bottom of the list. A new treatment with name **'cooling_1'** will be created. Select it and click on **'Rename'** button. In the new window that appears, type 'deformation' as the new name and click on **'OK'** button. In this simulation, three deformation runs will be represented. Click on **'Global' -> 'Thermo-mech. treatments'**, select **'cooling'** treatment and click on **'Duplicate'** button at the bottom of the list. A new treatment with name **'cooling_1'** will be created. Select it and click on **'Rename'** button. In the new window that appears, type 'deformation' as the new name and click on **'OK'** button.
  
-{{:tutorials:t21:img:t21_rename_tmt_6011003.png?650}}+{{:tutorials:t21:img:t21_rename_tmt_6050006.png?650}}
  
 In the newly created treatment, modify the first segment end temperature to 1000°C. Add a new segment, change the ramp control setting therein to **'Accumulated strain'** and set the **'Accumulated strain'** value to **'0.7'**.  In the newly created treatment, modify the first segment end temperature to 1000°C. Add a new segment, change the ramp control setting therein to **'Accumulated strain'** and set the **'Accumulated strain'** value to **'0.7'**. 
  
-{{:tutorials:t21:img:t21_deformation_segment_1_6011003.png?650}}+{{:tutorials:t21:img:t21_deformation_segment_1_6050006.png?650}}
  
 Afterwards, switch to the **'MS Evolution'** tab and type in the strain_rate value of **'0.15'**. Afterwards, switch to the **'MS Evolution'** tab and type in the strain_rate value of **'0.15'**.
  
-{{:tutorials:t21:img:t21_deformation_segment_6021003.png?650}}+{{:tutorials:t21:img:t21_deformation_segment_6050006.png?650}}
  
 The definition of the next segments should follow the settings below: The definition of the next segments should follow the settings below:
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 The complete treatment data are shown below. The complete treatment data are shown below.
  
-{{:tutorials:t21:img:t21_deformation_treatment_6011003.png?650}}+{{:tutorials:t21:img:t21_deformation_treatment_6050006.png?650}}
  
 ==== Deactivation of the volumetric misfit ==== ==== Deactivation of the volumetric misfit ====
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 As previously mentioned, some volumetric misfit might be present related to the precipitates appearing in the grains, decreasing thus their nucleation rate. However, the stress introduced during the applied deformation can cancel this effect. To account for this in MatCalc, clicking on **'Global' -> 'Phase status'** and select the **'Nucleation' -> 'Controls'** tab. Put a checkmark at **'ignore misfit stress during deformation'** for both precipitate phases. Click on 'OK' to close the window. As previously mentioned, some volumetric misfit might be present related to the precipitates appearing in the grains, decreasing thus their nucleation rate. However, the stress introduced during the applied deformation can cancel this effect. To account for this in MatCalc, clicking on **'Global' -> 'Phase status'** and select the **'Nucleation' -> 'Controls'** tab. Put a checkmark at **'ignore misfit stress during deformation'** for both precipitate phases. Click on 'OK' to close the window.
  
-{{:tutorials:t21:img:t21_ignore_misfit_deform_2017.png?650}}+{{:tutorials:t21:img:t21_ignore_misfit_deform_6050006.png?650}}
  
 ==== Kinetic simulation ==== ==== Kinetic simulation ====
  
-Click on **'Global' -> 'Buffers' -> 'Create'** to create a new buffer with the name **'Deformation'**. Afterwards, click on **'Calc' -> 'Precipitation kinetics'** and select **'deformation'** in **'from tm treatment:'** field. Start the calculation by clicking on **'OK'**. The results of the precipitation kinetics calculation are shown now with the blue curve.+Click on **'Global' -> 'Buffers' -> 'Create'** to create a new buffer with the name **'Deformation'**. Afterwards, click on **'Calc' -> 'Microstructure simulation'** and select **'deformation'** in **'from tm treatment:'** field. Start the calculation by clicking on **'OK'**. The results of the precipitation kinetics calculation are shown now with the blue curve.
  
 {{:tutorials:t21:img:t21_deformation_phase_fraction_6011003.png?650| MatCalc plot}} {{:tutorials:t21:img:t21_deformation_phase_fraction_6011003.png?650| MatCalc plot}}
 +
 {{:tutorials:t21:img:t21_deformation_number_density_6011003.png?650| MatCalc plot}} {{:tutorials:t21:img:t21_deformation_number_density_6011003.png?650| MatCalc plot}}
 +
 {{:tutorials:t21:img:t21_deformation_mean_radius_6011003.png?650| MatCalc plot}} {{:tutorials:t21:img:t21_deformation_mean_radius_6011003.png?650| MatCalc plot}}
  
tutorials/t21.1565714356.txt.gz · Last modified: 2019/08/13 18:39 by pwarczok
 
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