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Download Martensitic Transformation by Zenji Nishiyama PDF

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By Zenji Nishiyama

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Careful comparison of the electron micrograph and the corresponding electron diffraction pattern reveals that the twin boundary deviates from (112)a> by 3°-21°. The deviation angle is constant in each a' crystal but different in different a' crystals. It is considered that the existence of such deviations is due to the occurrence of another slip in the crystal. Such deviations from (112)α' have also been observed in later investigations. 1 0 3 ,41But 0 there is an opposing opinion 1 05 that such deviations are errors due to the buckling of the specimen foil.

A similar midrib has also been observed in the case of deformation twins 1 42 1 43 of α phases in F e - S i and F e - V alloys. This observation suggests that martensitic transformation by the u m k l a p p process is similar to formation of the deformation twin, and the similarity is of significance in the theory of the mechanism of the martensitic transformation. F r o m the foregoing facts the nature of the midrib is suggested to be as follows: the a' crystal forms initially at the midrib plane and grows laterally.

The morphology of such retained austenite is like a shadow behind the particle and the directions of these austenite shadows are all parallel but opposite on opposite sides of the midrib (the darkest central line). The lattice constants ofy and a' and the orientation relationships were obtained from Kossel patterns and the habit plane was measured. Using these data, the complementary shear predicted by the p h e n o m e n o ­ logical theory of the martensitic transformation was obtained by numerical calculations.

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