ferritic phase transformation

solid-solid phase transformations, influence of stresses and strains
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shaojielv
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ferritic phase transformation

Post by shaojielv » Sun Jun 26, 2022 4:25 pm

hello everyone,

In ferritic phase transformation process, the austenite grain boundary and three-phase junction setting, the nucleation process of grow up collision happened between the ferrite phase, and I have set the interaction force between the ferrite phase, but they did not appear the phenomenon of large grain with small grain size, and I want to make such mergers occur between ferrite grain, Do you have any good ideas about this problem? Thank you for your help.

Looking forward to your reply.

lv

Bernd
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Re: ferritic phase transformation

Post by Bernd » Mon Jun 27, 2022 2:44 pm

Dear lv,

Did not get your question, can you please explain?

Bernd

shaojielv
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Re: ferritic phase transformation

Post by shaojielv » Mon Jun 27, 2022 2:48 pm

Dear Bernd,

First of all, thank you for your reply. I will restate my question. I want the small ferrite nucleated at the boundary to be swallowed by the large ferrite grains instead of such extrusion, as shown in the figure below.

I wish you a pleasant life.

lv
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shaojielv
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Re: ferritic phase transformation

Post by shaojielv » Mon Jun 27, 2022 4:44 pm

Or what do you think might be the cause?

Bernd
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Re: ferritic phase transformation

Post by Bernd » Mon Jun 27, 2022 8:41 pm

Hi lv,

I think you can change the behavior by adjusting interfacial energy parameters: If σ(α-α) is chosen smaller than σ(α-γ), there should be wetting between the ferrite precipitates instead of rejection. A factor of 2 is sufficient to achieve full wetting, if the transformation is fully diffusion controlled.

Further, you can increase the interface mobility between the ferrite particles μ(α-α) in order to accelerate ferrite grain growth.

Bernd

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