In case where IF steel is heat treated in region, ! and ! transformation during heating and cooling, i.e. ! ! transformation, take place during heating and cooling, respectively. The initial texture of is potentially weakened due to two times transformation in general. On the contrary, the ! ! transformed texture resembles the initial texture clearly under specific circumstances. Authors call this phenomenon ''texture memory''. A very distinct texture memory effect was found in IF steels. Lowering the ! transformation temperature pronounces texture memory significantly. The variant selection at grain boundary of seems to play an important role. Moreover, it is considered that the initial texture has to be sharp to in order to realize texture memory.

Eftects of inhomogeneous shear strain on the texture variation through the thickness of hot rolled ferritic stainless steel sheets are studied.

No abstract

SynopsisThe X-ray diffraction line profile analysis technique has been applied to the study of fatigue damage below the surface of the work and the backup rolls of a cold strip mill, and the backup rolls of a hot strip mill. Half value breadth has been taken as a measure of fatiguing.The fatigued zone below the surface of the rolls correlated well with the half contact length, L, being 0.03 L in the work roll of cold strip mill and 0.1 L in the other rolls. Changes in the half value breadth with an increase in the number of cycles of roll contact differ according to the surface hardness of the roll: continued cycling results in a decrease in the half value breadth at the surface in hard rolls (Hs >_ 60), and an increase in soft rolls (Hs < 50). This technique, the X-ray study of fatigue, can be extended to the prediction and prevention of accidental failure of rolls due to fatigue fracture such as spalling. Furthermore, the amount of surface dressing at regular maintenance of rolls can be saved significantly on the basis of an accurate evaluation of the depth of the fatigue damaged zone.