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High-Tc superconducting quantum interference device observation of heat-affected zone in a spot-welded Fe-Cr-Ni system
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Copyright (2003) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.The following article appeared in Applied physics letters, 83(9), pp.1878 - 1880; 2003 and may be found at http://link.aip.org/link/?apl/83/1878
A study was carried out to observe a heat-affected zone (HAZ) in a deformed Fe-Cr-Ni system containing α′ martensite using high-Tc 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.
High-Tc superconducting quantum interference device observation of heat-affected zone in a spot-welded Fe-Cr-Ni system
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