Check these links dealing with the so-called Ferrite-Bainite-Marteniste Steels on the one hand, and also on High Strenght TRIP steels on the other hand.

http://www.sciencedirect.com/science/article/pii/S0921509307010027

http://www.sciencedirect.com/science/article/pii/S0921509306006769

http://www.sciencedirect.com/science/article/pii/S1359028604000774

http://www.sciencedirect.com/science/article/pii/S0921509307010027

http://www.sciencedirect.com/science/article/pii/S0921509306006769

http://www.sciencedirect.com/science/article/pii/S1359028604000774

Dear Jerome, thank you! The papers are nice but the data I need are lacking there.

Ok Nicolay.

You have just forget to specify which kind of data you are looking for.

This seems to be really my mistake. I am looking for such TEM data as lath, plates or subunits sizes and misorientations (not block and packet characteristics, which are determined by EBSD and available in the literature).

Dear Nikolay.

If he was engaged in research of these steels that should know, that they are difficult for distinguishing.

Dear Tamaz,

Really, they are difficult for distinguishing. However, it is possible (in certain steels) to obtain martensite at accelerated cooling but substantially lower bainite at slow cooling or appropriate isothermal holding.

May I just suggest to stick to the microstructural differences to distinguish between especially lower bainite and martensite? There are subtle differences that are actually great help:

Lower bainite contains Fe3C precipitates that form at about 60degree to the long axis of the the bainitic ferrite plate in which they are born, and they form only in one direction. Martensitic plates do not have those carbides except if they are tempered. And if the martensitic plates are tempered a similar Fe3C morphology is born but with one exceptional mode. And that is, tempered martensitic plates posses the same type of Fe3C lying at two directions within each plate.

One other issue that is very important is that martensitic plates, unless tempered, have much higher dislocation density, and in some cases very fine twins that will look as straight and closely spaced lines when viewed in TEM. For this reason, in TEM no matter how much you tilt the crystal you cannot get the plate(s) completely lit up (bright, i.e. free from diffraction effects). They will always look much darker than bainitic plates, although bainitic plates, and especially lower bainite, have high dislocation density as well. 

I am sure you know the case for upper bainite but I will just mention it for the sake of completing the argument. Upper bainite has Fe3C lying at the plate boundaries and it is much easier to distinguish them.

If you like I will send you actual micrographs to help you visualize what I am talking about.

Best luck...

Ali, thank you! Really, it is always useful to repeat foundation of physical metallurgy. But my question was specifically about the differences in the sizes and misorientations of alpha phase units (laths, plates) and subunits.

By the way,  some data about that I have found in the paper: L.C.Chang Mater. Sci. Eng. A368 (2004) 175.

Dear Nikolay, I am very sorry if I sounded like lecturing you. It was not my intention but was due to my misinterpretation of your quetion. And, by the way, many thanks for the useful reference.

Best wishes