Deformation induced martensitic transformation

[B.B]

Hello,

Could anyone explain to me the meaning of (strain-induced phase transformation of retained austenite to martensite)? and what is the difference between the martensite that forms by deformation and martensite that forms by rapid quenching?

Thank you

 

[metengr]

Sure. Use the internet and search for the above information. There are several good references.

 

[EdStainless]

Welcome to the world of meta-stable stainless steels.
Read up and come back when you have specific questions.

But one short answer, you can't form martensite in a SS by quenching, there is no C.
And in the case of SS the use of the word 'martensite' refers to the structure, not composition.

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P.E. Metallurgy, Plymouth Tube

 

[weldstan]

Just one caveat, Ed is addressing austenitic stainless.

 

[EdStainless]

Thanks Stan, yes if you are talking about retained austenite in steels, and then forming deformation martensite that is a whole different animal. Of course it is still a diffusion-less transformation, just a matter of atomic reordering.

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P.E. Metallurgy, Plymouth Tube

 

[arunmrao]

Ed, we can also classify high Mn steel to exhibit deformation induced hardening.

"Even,if you are a minority of one, truth is the truth."

Mahatma Gandhi.

 

[B.B]

Thanks a lot for your posts.
In particular, I'm studying high strength steels such as bearing and TRIP steels. In bearings, we form martensite in the final microstructure by ending the heat treatment with a fast quench. However, in TRIP steels martensite forms during deformation when austenite transforms to martensite. Here, in the case of TRIP steel, I'm confused about the mechanism in which martensite forms, that's why I posted this thread. I don't want a huge explanation, just a simple one will give me the light.


Thanks again.