Mr. Suzhou Zhang Profile

Suzhou Zhang

at East China Univ of Science and Technology

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Proceedings Article | 16 April 2013 Paper

The effect of creep on magnetic domain structure of heat resistant steels

S. Zhang, S. Tu

Proceedings Volume 8694, 86941X (2013) https://doi.org/10.1117/12.2011998

KEYWORDS: Magnetism, Multiphoton fluorescence microscopy, Heat treatments, Iron, Magnetometers, Photomicroscopy, Numerical analysis, Microscopes, Metals, Crystals

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The magnetic domain and magnetic properties of heat resistant steels including 10CrMo910, P91 and 23CrMoNiWV88 are investigated in the present work. The magnetic properties characterized by magnetic hysteresis loop of the three materials under 500-600^°C are measured by vibrating sample magnetometer (VSM). The magnetic domain structure of as-received and crept specimens is observed by magnetic force microscope (MFM). The magnetic domain of ferrite phase change from initial stripe pattern to maze pattern during creep. The black and white fringes and stripe-like pattern have also been found in the P91 and 23CrMoNiWV88 specimens, respectively. The experimental results reveal that the magnetic domain structure is strongly influenced by microstructures with different distributions of the carbides. It is shown that the coercivity and remanence of each material although has a remarkable decrease at 500-600^°C especially for P91 almost 64% decrease, it’s still the same magnitude as the one at room temperature. All the short-term crept specimens with different creep damage have a linear increase in coercivity and remanence comparing to the as-received 10CrMo910 specimens. These results indicate that it should be possible to develop an in-situ monitoring technology for creep damage based on magnetism measurement.

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