论文信息 - Characterization of microstructures in 17-4-PH stainless steel by magnetic Barkhausen noise analysis

Characterization of microstructures in 17-4-PH stainless steel by magnetic Barkhausen noise analysis

Magnetic Barkhausen noise (MBN) signals have been used to characterize the microstructures in quench-aged precipitation hardening 17-4-PH stainless steel. The MBN data have been compared with hardness and coercivity. Microstructures were evaluated by optical, scanning electron and transmission electron microscopy. It was found that MBN signals correlate well with the microstructures manifested by the presence of intra-lath spherical and inter-lath copper-rich non-magnetic precipitates. The presence of coherency strains at the peak hardness regions of the aged specimens could be inferred from the MBN data. MBN signals were found to provide a better criterion for the detection of the maximum in coherency strains than the usual hardness data.

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