1989 Volume 75 Issue 6 Pages 941-947
The effect of hot rolling conditions on transformation textures, Lankford values (r), and earing on deep-drawn cups have been studied using a low-carbon Al-killed steel, a B-bearing mild steel, and a high strength steel containing Ti or Nb. All samples were produced on a commercial hot strip mill. The effect of B and Nb additions on austenite recrystallization behavior was also studied.
Transformation textures of the various hot-rolled steel sheets were analyzed from the view point of the retardation degree of recrystallization. It was concluded that there were two types of transformation textures. The first one was transformed from unrecrystallized austenite with rolling texture and the other from recrystallized austenite with recrystallization texture.
The planar anisotropy of r values in the low-carbon Al-killed steel and the B-bearing steel samples decreased at high finishing temperatures even above the Ar3 temperature. This phenomenon was not due to a random orientation, but rather due to the coexistence of orientation which mutually canceled out the individual planar anisotropies.