MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Influence of Precipitate and Martensite Lath on the Magnetic Properties in Creep Damaged 11Cr-3.45W Steel
Chung Seok KimSook In Kwun
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2007 Volume 48 Issue 11 Pages 3028-3030

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Abstract

The influence of microstructure on the magnetic properties was experimentally investigated to estimate the creep damage in ferritic 11Cr-3.45W steel as an applicable research for the structural health monitoring. The microstructure showed significant changes in precipitate size (dp), precipitate number (N), dislocation density (ρ) and martensite lath width (ω) during creep. The magnetic coercivity decreased with creep duration and depended strongly on precipitate number and lath width. However, the magnetic saturation and remanence did not change after 500 h creep duration. The correlation between the microstructural changes and coercivity was discussed.

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© 2007 The Japan Institute of Metals and Materials
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