Decoupling the effect of stress and microstructure on MBN response in cast Q1N steel

Abstract

Q1N samples with different degrees of tempering were produced and changes in MBN energies in non-stressed and stressed samples was investigated. It was observed that while MBN energy decreased with increasing degree of tempering, it increased with applied uniaxial stress and the two opposing effects cannot be easily separated. MBN energy increased with stress along RD and decreased in the transverse direction (TD). Therefore, the ratio of MBN energy in RD to TD was examined. The value of the ratio at 0.3 T was successfully shown to be strongly correlated with applied uniaxial tensile stress level, regardless of the degree of tempering (pinning site density) in Q1N samples.

KEYWORDS:

• degree of tempering
• magnetic Barkhausen noise
• uniaxial stress
• pinning site density
• 180° domain wall
• magnetic Barkhausen noise energy
• θ parameter
• non-destructive stress evaluation

Disclosure statement

No potential conflict of interest was reported by the author(s).