Abstract
Intra-granular creep distortion of 2.25Cr-1Mo steel deformed at 843K and 106MPa has been investigated by transmission electron microscopy (TEM). Intra-granular distortion detected by Kikuchi pattern shifting was observed quite early (<1% strain) before sub-grain structure is developed. Average misorientation change was proportional to the distance between measurement points in the grain. In order to determine average internal distortion ed, mean values of tilt angle/distance from certain point were calculated in several grains. Internal distortion ed showed good correlation with creep strain ec under the test condition and preparaed a method of creep strain measurement.
