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KMID : 0371819970290050361
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Nuclear Engineering and Technology
1997 Volume.29 No. 5 p.361 ~ p.367
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Analysis of Phase Separation by Thermal Aging in Duplex Stainless Steels by Magnetic Methods
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Kim, Sunki
Jae, Wonmok/Kim, Yongsoo
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Abstract
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The phase separation in ferrite phase of duplex stainless steel is the primary cause of thermal aging embrittlement of the LWR primary pressure boundary components. In this study the phase separation of simulated duplex stainless steel was detected by Mossbauer spectroscopy and magnetic property analysis by VSWAbrating Specimen Magnetometer). The simulated duplex stainless steels, Fe-Cr binary, Fe-Cr-Ni ternary, and Fe-Cr-Ni-Si quartemary alloys, were aged at 370 and 400`Cup to 5,340 hours. It was observed from Mossbauer spectra analysis that internal magnetic field increases with aging time and from VSM that the specific saturation magnetization and Curie temperature increase with aging time. These results are indicative that phase separation into Fe-rich region and Cr-rich region is caused by thermal aging in the temperature range of 370~400℃. In cases of specimens containing Ni, the increase of specific saturation magnetization is much higher. This implies that Ni seems to promote Fe-Cr interdiffusion, which accelerates the phase separation into Fe-rich a phase and Cr-rich a´ phase.
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