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oai:www.ideals.illinois.edu:2142/22654 2023-07-10 col_2142_5131 col_2142_14837 com_2142_5130 com_2142_14836 com_2142_234

Stubbins, James F. Shong, Wei-Ja 2011-05-07T13:46:57Z 2011-05-07T13:46:57Z 10000-01-01 1995 Mechanical and magnetic property changes due to neutron irradiation and heat treatment were investigated for the sake of developing a nondestructive method of monitoring nuclear pressure vessel steel embrittlement during reactor operation. Four kinds of samples, including pressure vessel steel, pure Fe and Ni, Fe-Cu alloys and Charpy surveillance coupons, were examined. An automated magnetic property measuring system was constructed and measuring schemes were established. Microhardness and magnetic coercivity, remanence, permeability, and hysteresis loss were measured as a function of a variety of irradiation and annealing exposures. The results were interpreted in terms of dislocation and magnetic domain wall pinning mechanisms and internal stress relaxation. It is found that the pinning mechanisms of dislocations and domain walls are different with respect to the effective pinning parameters. However, stress relaxation has similar effects on both microhardness and magnetic coercivity. It is concluded that the selection of testing material, specimen size and shape, and magnetizing scheme are important factors for constructing a nondestructive testing method for reactor pressure vessel surveillance. Made available in DSpace on 2011-05-07T13:46:57Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9624498.pdf: 5419822 bytes, checksum: a116ddc304b16be450742f7cc6fdccb3 (MD5) Previous issue date: 1995 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:59:06Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:27:50-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9624498 (UMI)AAI9624498 http://hdl.handle.net/2142/22654 eng Copyright 1995 Shong, Wei-Ja Engineering, Nuclear Engineering, Metallurgy Engineering, Materials Science Magnetic analysis of nuclear pressure vessel steels and other ferromagnetic materials subject to neutron irradiation and heat treatment text Nuclear, Plasma, and Radiological Engineering Nuclear, Plasma, and Radiological Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.