Nondestructive evaluation of steels using acoustic and magnetic Barkhausen signals - II. Effect of intergranular impurity segregation
The present paper has studied the influence of intergranular impurity segregation on acoustic and magnetic Barkhausen signals induced during magnetization of an undoped nickel-chromium steel and doped steels with antimony, tin or phosphorous. While the intergranular segregation did not affect the magnetic hysteresis loop, it caused the characteristics of the acoustic and magnetic signals to change in a different manner. The impurity-doped steels produced a higher magnitude of the acoustic signal than the undoped one. However, the acoustic signal intensity of the impurity-doped steels remained the same independent of the quantity and type of segregants. With increasing segregants, the magnitude of the magnetic signal initially decreased and then increased above 0.078 atomic fraction. The magnetic signal did not depend on the type of segregants. The effect of segregated impurities on the grain boundary energy and magnetostatic energy at grain boundaries which change the nucleation and growth processes of domains is discussed.
- Research Organization:
- Ames Lab., Iowa State Univ., Ames, IA 50011
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5524971
- Journal Information:
- Acta Metall.; (United States), Vol. 35:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NICKEL-CHROMIUM STEELS
ACOUSTIC TESTING
IMPURITIES
MAGNETIC TESTING
ANTIMONY
CRYSTAL GROWTH
DOPED MATERIALS
GRAIN BOUNDARIES
NUCLEATION
PHOSPHORUS
STRUCTURAL CHEMICAL ANALYSIS
TIN
ALLOYS
CHROMIUM ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
METALS
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL STEELS
NONDESTRUCTIVE TESTING
NONMETALS
STEELS
TESTING
360102* - Metals & Alloys- Structure & Phase Studies