Effects of Heating Rates on Primary Recrystallization Textures in Pure Molybdenum and TZM Alloy Sheets.

Abstract

In order to control the primary recrystallization textures of pure molybdenum (pure Mo) and molybdenum-0.5mass% Ti-0.1%Zr-0.5%C alloy (TZM alloy) sheets, the effects of heating rates during annealing on the development of recrystallization texture were investigated by means of X-ray diffraction and line broadening techniques. Recrystallization at a rapid heating rate produces a texture which is substantially similar to the rolling texture in both pure Mo and TZM alloy sheets, i.e. a ({100} +{111} +{211} ) type texture. While recrystallzation at a slow heating rate produces a texture which is significantly different from the rolling texture in both sheets, i.e. a strong {111} type texture. Changes in the primary recrystallization textures of both molybdenum sheets which were brought about at different heating rates are considered mainly to arise as a result of the difference in the orientation dependence of degree of recovery for the deformed fine structures (potential nuclei of recrystallization).