Study of Micro-Texture during Recovery and Recrystallisation in Folded BCC and FCC Sheet Samples

Abstract:

The sheet folding process generates both tensile and compressive strains across the folded section, producing systematic strain and texture gradients. In this investigation the EBSD technique has been used to gain insight into this phenomenon in folded ferritic steel and nickel alloys, both in the as folded and after annealing conditions. As expected in the fcc material the {111} and {110} fibre texture components get reinforced in the tensile and compressive regions respectively, while the {110} and {111} components are reinforced in the bcc material during folding. After annealing at 600oC for 40 minutes the texture components formed during the folding process are retained despite the formation of new strain free grains. The new grains were found to be slightly larger in the tensile regions than in the compressed regions this was the case for both materials. However, in the mid-region of the section in the nickel alloy abnormal grain growth took place, while only recovery was observed in the ferritic alloy.

• Periodical: Materials Science Forum (Volumes 702-703)
• Pages: 667-670
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.702-703.667
• Online since: December 2011
• Authors: Harvinder Singh Ubhi, Hui Jiang
• Keywords: Annealing, Deformation, EBSD, Folded Bcc Fcc Sheets, Micro Texture

References

[1] H S Ubhi and H Jiang, to be published, Proceedings Rex and GG, (2010).

[2] I L Dillamore and W T Roberts, Metallurgical Reviews Vol 10 (1967).

[20] [40] [60] [80] 100 120 0 500 1000 1500 2000 grain size (µm) distance (µm) grain size vs distance - nickel HT 600° C as folded tension compression.

[1] [2] [3] 0 500 1000 1500 2000 mean mis-orientation (degs) distance (µm) mis-orientation vs dist - nickel HT 600° C as folded tension compression Tensile Neutral Compression Tensile Neutral Compression Figure 5. EBSD IPF map across the as the as folded steeel sheet and associated pole figures Figure 6. EBSD IPF map across the annealed steel sheet and associated pole figures a) b) Figure 7. a) Grain size vs distance and b) Mis-orientation vs distance plots for the steel sheet.

[5] [10] [15] [20] [25] [30] [35] 0 500 1000 1500 grain size (µm) distance (µm) grain size vs distance - steel HT 600° C as folded compression tension.

[1] [2] [3] [4] [5] 0 500 1000 1500 mean mis-orientation (degs) distance (µm) mis-orientation vs dist - steel HT 600° C as folded compression tension Tensile Neutral Compression Tensile Neutral Compression.