Assessment of creep damage of ferromagnetic material using magnetic inspection
- Ames Lab., IA (United States) Iowa State Univ., Ames, IA (United States). Center for NDE
- Southwest Research Inst., San Antonio, TX (United States)
Results of inspection creep damage by magnetic hysteresis measurements on Cr-Mo steel are presented. It is shown that structure sensitive parameters such as coercivity, remanence and hysteresis loss are sensitive to the creep damage. Previous metallographic studies have shown that creep changes the microstructure of the material by introducing voids, dislocations, and grain boundary cavities. As cavities develop, dislocations and voids move out to the grain boundaries; therefore the total pinning sources for domain wall motion are reduced. This, together with the introduction of a demagnetization field due to the cavities, results in the decrease of both coercivity and remanence. Numerical computations with a modified Jiles-Atherton model are presented which are consistent with the proposed mechanisms.
- OSTI ID:
- 6883133
- Report Number(s):
- CONF-940629-; CODEN: IEMGAQ
- Journal Information:
- IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Vol. 30:6Pt1; Conference: Intermag: 6th joint conference on magnetism and magnetic materials, Albuquerque, NM (United States), 20-23 Jun 1994; ISSN 0018-9464
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
CHROMIUM-MOLYBDENUM STEELS
CREEP
MAGNETIC TESTING
COERCIVE FORCE
EXPERIMENTAL DATA
MATHEMATICAL MODELS
MICROSTRUCTURE
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
DATA
HIGH ALLOY STEELS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NONDESTRUCTIVE TESTING
NUMERICAL DATA
STAINLESS STEELS
STEELS
TESTING
360103* - Metals & Alloys- Mechanical Properties
420500 - Engineering- Materials Testing