> For the complete documentation index, see [llms.txt](https://dante-solutions-inc.gitbook.io/dante-6.3-help-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dante-solutions-inc.gitbook.io/dante-6.3-help-documentation/introduction-2/dilot-fit.md).

# Dilot Fit

<figure><img src="https://3062023715-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0UQEr9tolIKQwZXdPc9a%2Fuploads%2FWsINYiG9q9suDTW6ODyI%2FDilotFit_256.png?alt=media&amp;token=21e5e32d-82e1-4524-b50e-b7034fd36c99" alt=""><figcaption></figcaption></figure>

The Dilot Fit utility is used to fit the diffusive and martensitic phase transformations kinetics to the parameters within the DANTE phase transformation model using experimental data. The Dilot Fit utility support the use of JMatPro data. By fitting for the phase transformation kinetics, the user can more accurately capture the material behavior of a part for any thermal process from heating to quenching.

## Use Case

One use case is to use the Dilot Fit utility is to fit for the Martensite phase transformation kinetics based on experimental data. Given the time, temperature, strain experimental data, the martensite phase transformation kinetics can be fitted.

![](https://3062023715-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0UQEr9tolIKQwZXdPc9a%2Fuploads%2Fgit-blob-7f28e66f11111e8ce6273103d1eb764e36234fe7%2FDilot_Fit_Mart_Data.png?alt=media)

First, define the fitting parameters as seen in the figure below. The fitting type in this case will be set to strain, the phase option will be Martensite, and the Random Search method will be used. The default number of loops is 100 and the curve fitting method will be temperature.

![](https://3062023715-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0UQEr9tolIKQwZXdPc9a%2Fuploads%2Fgit-blob-4b6fb4c2bc643e0dadd19279755b171dddd81b98%2FDilot_Fit_Ex_Controls.png?alt=media)

The fitted plot and results can be seen below.

![](https://3062023715-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0UQEr9tolIKQwZXdPc9a%2Fuploads%2Fgit-blob-b82f2e138eb70e78d44229492bc1705013658f39%2FDilot_Fit_Fitted_Plot.png?alt=media)

![](https://3062023715-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0UQEr9tolIKQwZXdPc9a%2Fuploads%2Fgit-blob-a31dbd8654894c1bea05ab79fb7ac2236801000d%2FDilot_Fit_Results.png?alt=media)

The phase transformation kinetics can be input into the DANTE material database for the specific phase and carbon level. In this case, the 0.10% carbon level is highlighted. The first value represents the martensite start, the next 4 levels represent the nu, alpha, beta, and epsilon values which control the Martensite transformation kinetics.

![](https://3062023715-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F0UQEr9tolIKQwZXdPc9a%2Fuploads%2Fgit-blob-61b47cf18dfa6e5b958f75765cc87c0cbd2eb167%2FDQT_File.png?alt=media)