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Greenleader (Aerospace)
20 Jan 05 18:21
I am not a metallurgist, so please be easy with the terms. I have a question; is magnetic field induced martensite, and strain induced martensite, different terms for the same process?  Thanks,  Gerald
Helpful Member!  metengr (Materials)
21 Jan 05 10:14
Here is a web site to obtain several technical papers on this topic. Even as a metallurgist, I had to read the Abstracts twice to comprehend this information.

http://www.sendai.kopas.co.jp/METAL/PUBS/thesis_e/e_abst/41-08/index.html
Helpful Member!  Carburize (Materials)
21 Jan 05 10:28
Whoa!! Heavy stuff but I think they answer your question.
It appears that they are not the same, the magnetic field induced transformation seems to be a reversible phenomenon in some shape memory alloys and only exists while the field is applied.Stain induced transformation is however not reversible and can occur in more conventional alloys.
metengr (Materials)
21 Jan 05 10:30
As a side note to magnetic fields, I found this interesting technical presentation by our friends at Oak Ridge on the topic of "Ultrahigh Magnetic Field Processing of Materials for Developing Customized Microstructures and Enhanced Performance"

www.oit.doe.gov/imf/pdfs/revpres_10_ludtka.pdf
Greenleader (Aerospace)
21 Jan 05 10:35
Much obliged, metenger!

I just discovered this topic, so I have a lot of reading to do.  Thanks again,  Jerry
Helpful Member!  mcguire (Materials)
21 Jan 05 10:37
As meteng pointed out, there can be a transformation from austenite to martensite induced by applying a magnetic field which reverses with the removal of the field. The strain induced transformation requires significant plastic deformation and remains after the stress which imposed the strain is removed.
arunmrao (Materials)
21 Jan 05 11:11
I learnt something new. Though this was vaguely  in my memory that one transformation is reversible while the other is not. Great posting and equally good responses.
metman (Materials)
22 Jan 05 6:08
Greenleader,

For more reading on the subject, the following link gives some practial applications of strain induced martensite:

forums/0001.htm

Helpful Member!  unclesyd (Materials)
28 Jan 05 21:06
Not quite on topic but interesting. Take a look at the first set of papers.

 http://www.gamf.hu/indexe.php?modul=research

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