2003 Volume 43 Issue 7 Pages 1073-1079
The microstructure of {225}f martensite transformation in Fe-Cr-C alloy was analyzed by means of transmission electron microscopy (TEM), and the habit plane rotation was predicted by means of Displacement Vector Theory, and its surface relief effect was observed and a mathematical model for the quantitative analysis of habit plane rotation of {225}f martensite transformation was established by means of atomic force microscopy (AFM). The experiment showed that the habit plane rotation of {225}f martensite transformation predicted by means of Displacement Vector Theory was 9.89°, which was incompatible with the concept of invariant plane strain (IPS); its surface relief revealed no character of IPS, that is, the formerly formed “surface relief packet” was irregular “N”-shaped, as well as one surface was planar, and the other surface was curved, and the latterly formed “surface relief packet” was irregular “N”-shaped, composed of layers of some small surface relives; the habit plane rotation of {225}f martensite transformation quantitatively analyzed (7.69°) by means of AFM was in agreement with the prediction of Displacement Vector Theory (7.98°), and it firmly confirmed the correctness of Displacement Vector Theory.
