Effect of annealing treatment on magnetic texture of cold rolled ULC steel

• Published in: Materials letters Vol. 276; p. 128211
• Main Authors: Dutta, Siuli, Panda, Ashis K., Chatterjee, Subrata, Roy, Rajat K.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-10-2020; Elsevier BV
• Subjects: Anisotropy; Annealing; Barkhausen effect; Cold; Cold rolling; Cold-rolled steel; EBSD; Emission analysis; Heat resistant steels; High temperature; Low temperature; Magnetic Barkhausen emissions; Materials science; Misalignment; ULC steel; Cold rolling; Annealing; Magnetic Barkhausen emissions; Anisotropy; ULC steel; EBSD
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2020.128211

Magnetic texture of cold-rolled ULC steel to resolve anisotropy behaviour during annealing.
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•Magnetic Barkhausen voltage of cold rolled (CR) ultra low carbon steel is evaluated at different annealing temperatures.•High dislocations density in 80% CR steel causes lower magnetic voltage along RD than 50% CR steel.•Magnetic anisotropy factor (k) varies gently at recovery and abruptly at recrystallization initiation.•Magnetic texture resolved by k factor relates to recrystallization behavior of cold rolled steels.
Anisotropic behaviors of cold rolled and annealed ULC steels are evaluated by orientation imaging microscopy (OIM) and magnetic Barkhausen emission (MBE) techniques. The MBE voltage is found higher along RD than TD, indicating the presence of favorable magnetic easy axis along RD for both 50 and 80% cold rolled steels. The recovery occurred at low temperature (T < 500 °C) annealing causes a higher anisotropy coefficient (‘k’) for 50% than 80% CR steel, while at high temperature (T > 500 °C) annealing leads to an abrupt drop of ‘k’ value for both cold rolled steels. Furthermore, the kernel average misorientation map, obtained from OIM, decreases with increasing annealing temperatures.