Optimization of Annealing Parameters for Improvement in Formability of Extra Deep Drawing Quality Steel

Sarkar, B.; Jha, B. K.; Deva, Anjana

doi:10.1361/10599490419252

Cited by 8 publications

(2 citation statements)

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“…The AlN precipitates form on the defects of cold rolled structure and thus, recrystallization is retarded. A remarkable enhancement of {111}<uvw> crystallographic orientation occurs as nucleation occurs more rapidly in grains of this type (Beranger et al, 1996) EDD steel sheets are produced by either batch or continuous annealing of cold-rolled steel sheets containing carbon up to about 0.05% and Mn up to about 0.2% (Sarkar et al, 2004). However, the physical processes involved in these processes are different.…”

Section: Processing Of Aluminium Killed Edd Steelsmentioning

confidence: 99%

Physical Metallurgy and Drawability of Extra Deep Drawing and Interstitial Free Steels

Banerjee¹

2012

Recrystallization

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Section: Processing Of Aluminium Killed Edd Steelsmentioning

confidence: 99%

Physical Metallurgy and Drawability of Extra Deep Drawing and Interstitial Free Steels

Banerjee¹

2012

Recrystallization

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“…The sluggish recrystallization behavior is believed to be responsible for the non-recrystallization in the case of relatively higher-deformed material. In literature it is reported [34] that a very high proportion of these non-recrystallized regions have the near -fiber orientations, that is, I and H components and by orientation image microscopy it was observed that certain deformed Downloaded by [University of Sussex Library] at 14:59 05 June 2016 (containing I and H, low angle boundaries) regions show an extreme reluctance to recrystallize. The sharper -fiber and weaker -fiber in EDD-69% CR than 63% CR is reflected in the volume fraction of the fibers as well as in the corresponding texture components.…”

Section: Texture and Microstructure Of Crba If Materialsmentioning

confidence: 99%

Evaluation of Annealing Texture in IF and EDD Steel Sheets

Banerjee

2007

Materials and Manufacturing Processes

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The textural and microstructural studies of cold-rolled-batch annealed (CRBA) interstitial free-Ti (IF-Ti) stabilized steel and extra deep drawing steel (EDD) produced at Tata Steel have been investigated. In the IF steels, -fiber has been found to be strong even after batch annealing, which is not desirable for deep drawing applications. The presence of a stronger recrystallization texture in the surface region rather than in the central region accounts for the deformation and orientation path history of cold-rolling texture components and the texture inherited from hot band. The hot band of IF steel has been observed to have mixture of grain structure along with inhomogeneous texture throughout the thickness. While the inhomogeneity in EDD steel, pancake grain structure in the through-thickness direction, milder pancake grains in the transverse section, and polygonal grain structure in the longitudinal section have led to the inference that the undesirable -fiber is present. This observation has been explained by the early precipitation of AlN during coiling. The results of all the steels have been explained with the help of the orientation distribution functions, volume fraction of alpha and gamma fiber along with their components, volume fraction ratio ( / , and the microstructure. The analysis of the present data suggests that the deep drawability of both steels can be improved by modifying the hot-rolling and annealing parameters. IntroductionThe deep drawing steels interstitial free (IF) and extra deep drawing (EDD) are widely used structural materials. To improve the drawability of the deep drawing sheet and at the same time to make the edge on the top of a drawn cup smooth without the phenomenon of earing, the steel needs to possess a high normal anisotropy (Lankford parameter), r m , and low planar anisotropy, r. The r-value is defined as the ratio of the true strains in the width and thickness directions. Conventionally, this is obtained from measurements of width and length strains because of the large uncertainties of thickness strains. While, the variation of r with angle around the sheet gives further information about the extent of planar anisotropy, r. An average rvalue r m and r are defined as follows:

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