Characterization of the Residual Stresses in Plastically Deformed Ferrite-Martensite Steels Using Barkhausen Noise Measurements

Abstract

In this work, we show that the measurement of the Barkhausen noise allows the residual stresses in each of the two phases of ferrite-martensite steels to be characterized. We have first studied the effect of a tensile and a compressive stress on the Barkhausen noise signature. We observed that for a ferrite-martensite steel, the application of a tensile stress increases the Barkhausen activity of the martensite and ferrite phases, whereas a compressive one reduces it. In a second time, we induced residual stresses by applying a plastic deformation to ferrite-martensite steels. After a tensile plastic deformation, we observed that (i) compressive residual stresses appear in ferrite, and (ii) tensile residual stresses appear in martensite. An opposite behavior is observed after a compressive plastic deformation. These results show that the Barkhausen noise measurement makes it possible to highlight in a nondestructive way the distribution of the stresses in each of the two phases of a ferrite-martensite steel. This result could be used to characterize industrial Dual- Phases steels that are plastically deformed during mechanical processes.

An attempt of characterization of stress state in high carbon C68D steel wire rod by Barkhausen noise method

“…by [18]. Observing both of waveforms, although the two peaks on MBN were not clearly visible, it can be concluded that the stress significantly affect rather the first part of Barkhausen signal, which was produced by ferrite component [19]. Figure 5 shown the variation of MBN RMS with magnetization current I m (given in arbitrary unit) and applied external tensile stress from 0 (σ 0 ) to 460 MPa (+σ 4 ) in elastic strain range.…”

Barkhausen noise signal of different steels upon face-turning process

“…BN signal analysis has been a research topic in the literature to determine the surface-hardened depth by induction hardening [5], to study the effect of applied stress and residual stress due to plastic deformation on steels [6][7][8], to assess the microstructure changes during tempering [9] and ferrite proportion in dual-phase steels [10] and to characterize the pearlite grains in plain carbon steel [11]. Measurement and analysis of the BN envelope or root-mean-square (RMS) profile plotted against the applied voltage or current and its peak position and magnitude to related with the phenomenon.…”