Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2006-06-27
2006-06-27
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S448000
Reexamination Certificate
active
07068054
ABSTRACT:
An alloy solute sensor probe, measurement system and measurement method are disclosed for directly measuring solute concentration profiles in conductive material components at elevated processing temperatures. The disclosed device and method permit direct, real-time non-destructive measurement of solute concentration profiles in treated surfaces in alloy components. In disclosed embodiments, a novel concentric carbon sensor and rod-shaped carbon sensor are disclosed which employ AC frequencies for probing the subsurface region of alloy samples to determine carbon concentration profiles at steel surfaces from measurements of alloy resistivity profiles. Results of carbon profile measurements obtained with the disclosed device and method compare favorably with conventional destructive analytical measurements made on post-processed samples. The sensor probe and method may be utilized to determine solute concentration profiles with a variety of solute materials and alloy compositions and may be advantageously employed in alloy surface processing, carburization heat treatments, induction heating and fatigue fracture applications.
REFERENCES:
patent: 3487301 (1969-12-01), Gardner et al.
patent: 4068168 (1978-01-01), Boonstra
patent: 6566636 (2003-05-01), Bentley et al.
patent: 6788076 (2004-09-01), Howland
patent: 2005/0068047 (2005-03-01), Claus
A. Matthiessen et al., “Ueber den Einfluss der Temperature auf die elektrische Leitungsfahigkeit der Legirungen”, Annalen der Physick und Chemie, Funfte Reihe, Zweiter Band, ed. J.C. Poggendorff, Johann Abrosius Barth (Leipzig 1864), p. 19-78.
E.D. Campbell et al., “The Specific Resistance and Thermo-Electromotive Potential of Some Steels Differing Only in Carbon Content”, J. Iron Steel Inst., vol. CXIII, No. 1, p. 375-392.
R.M. Bozorth, Ferromagnetism, Van Nostrand (Princeton 1951) p. 367.
F. Bitter, Currents, Fields and Particles, MIT Technology Press/John Wiley (New York 1956), p. 100-110.
B.R. Tittmann et al., “Measurement of Physical Property Gradients with Elastic Surface Wave Dispersion”, Proc. 9th Symp. on Nondestructive Evaluation, Apr. 25-27, 1973, San Antonio, TX, Amer. Soc. for Nondestructive Testing/Southwest Research Inst., p. 20-28 (1973).
M. Pancholy et al., “Ultrasonic Attenuation in Carbon Steels”, Indian J. Technology, vol. 19, p. 493-498, Dec. 1981.
B.R. Tittmann et al., “Determination of Physical Property Gradients from Measured Surface Wave Dispersion”, IEEE Trans. vol. UFFC-34, No. 5, p. 500-507, Sep. 1987.
R.D. Mitra, “Case Depth Evaluation of Carburized Specimens Using Ultrasonic Methods”, S.B./S.M. Thesis, M.I.T. (Cambridge 1993).
S. Vaidyanathan, “Evaluation of Carburization Depth in Service Exposed Ferritic Steel Using Magnetic Barkhausen Noise Analysis”, Proc. 14th World Conf. on NDT, New Delhi, India, Dec. 8-13, 1996, Trends in NDE Science and Technlogy, vol. 3,, ed. C.G. Krishnadas Nair et al., A.A. Balkema (Rotterdam 1997), p. 1639-1642.
Chedid Loutfallah Georges
Makhlouf Makhlouf M.
Sisson, Jr. Richard D.
Creehan, Esq. R. Dennis
Deb Anjan
Worcester Polytechnic Institute
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