Detection of the Oscillation Marks on Casting Slabs Using Magnetic Flux Variation and the Nonexcitation Method
FENG Kaibin1, LIU Runcong1, LI Silong1, WU Yunfei1,2, NA Xianzhao1,2, WANG Xiaodong1,3,*
1 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Science, Beijing 100049, China 2 State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China 3 International Innovation Center for Materials and Mechanical Engineering, University of Chinese Academy of Science, Beijing 100049, China
Abstract: The residual stray magnetic fields present in ferromagnetic casting slabs were investigated in this work, which result from the magnetic fields generated during the steel casting process. Existing optical detection methods face challenges owing to surface oxide scales, and conventional high-precision magnetic sensors are ineffective at high temperatures. To overcome these limitations, a small coil sensor was employed to measure the residual magnetism strength in oscillation traces, using metal magnetic memory and electromagnetic induction methods, which can carry out detection without an external excitation source. Using this technology, the proposed scheme successfully detects defects at high tempe-ratures (up to 670 ℃) without a cooling device. The key findings include the ability to detect both surface and near-surface defects, such as cracks and oscillation marks, with an enhanced signal-to-noise ratio (SNR) of 7.2 dB after signal processing. The method's practicality was validated in a steel mill environment, where testing on casting slabs effectively detected defects, providing a foundation for improving industrial quality control. The proposed detection scheme offers a significant advancement in nondestructive testing (NDT) for high-temperature applications, contributing to more efficient and accurate monitoring of ferromagnetic material integrity.
冯凯斌, 刘润聪, 李思龙, 吴云飞, 那贤昭, 王晓东. 基于非激励的连铸坯振痕检测方法[J]. 材料导报, 2026, 40(1): 25010165-10.
FENG Kaibin, LIU Runcong, LI Silong, WU Yunfei, NA Xianzhao, WANG Xiaodong. Detection of the Oscillation Marks on Casting Slabs Using Magnetic Flux Variation and the Nonexcitation Method. Materials Reports, 2026, 40(1): 25010165-10.
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2026, Vol. 40 
