High-T[sub c] superconducting quantum interference device observation of heat-affected zone in a spot-welded Fe–Cr–Ni system

Watanabe, Yoshimi; Kang, S. H.; Chan, J. W.; Morris Jr., J. W.; Clarke, John
September 2003
Applied Physics Letters;9/1/2003, Vol. 83 Issue 9, p1878
Academic Journal
A study was carried out to observe a heat-affected zone (HAZ) in a deformed Fe–Cr–Ni system containing α[sup ′] martensite using high-T[sub c] superconducting quantum interference device (SQUID) microscopy. Microstructure and remanent magnetization images were studied by an optical microscope and a SQUID microscope, respectively. The HAZ, in which only the face-centered-cubic austenite phase exists, could be visualized by the SQUID microscope. It was also found that the SQUID images were consistent with the results from the microstructural analysis. It was concluded that a simple SQUID measurement may serve as an effective method for a nondestructive evaluation of ferromagnetic steel phases by correlating remanent magnetization images to microstructural characteristics. © 2003 American Institute of Physics.


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