Effects of creep damage, shot peening, and case hardening on magnetic Barkhausen noise analysis

Conference · Tue Nov 01 00:00:00 EST 1994 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6877833

Sipahi, L B ^[1]

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1. Ames Lab., IA (United States) Iowa State Univ., Ames, IA (United States). Inst. for Physical Research and Technology

The micromagnetic emissions, commonly known as Barkhausen noise, are very sensitive to variations in the microstructure and sub-surface stress states of magnetic materials. Steel pipelines at power plants often have creep damage due to microstructural changes in their service life. Early detection of this damage will prevent costly failures. There is also an increasing demand to characterize the sub-surface stress states in structural materials such as high strength materials used in landing gear components in the aerospace industry. Shot peening is used to improve the fatigue strength of these components by the introduction of residual compressive stresses to the surface. Because the magnitude of Barkhausen noise varies with the magnitude of compressive stress, these noise measurements can be used for in-situ evaluation of the effectiveness of the shot peening process. Furthermore, surface modification such as case hardened magnetic samples can be easily observed using micromagnetic Barkhausen noise (MBE) to determine further modification needs.

• OSTI ID: 6877833
• 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

Related Subjects

42 ENGINEERING
36 MATERIALS SCIENCE
PIPES
CREEP
MAGNETIC TESTING
SHOT PEENING
SURFACE HARDENING
STEELS
QUALITY ASSURANCE
ALLOYS
COLD WORKING
FABRICATION
HARDENING
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MATERIALS WORKING
MECHANICAL PROPERTIES
NONDESTRUCTIVE TESTING
SURFACE TREATMENTS
TESTING
420500* - Engineering- Materials Testing
360103 - Metals & Alloys- Mechanical Properties
360101 - Metals & Alloys- Preparation & Fabrication