Metal treatment – Process of modifying or maintaining internal physical... – With measuring – testing – or sensing
Reexamination Certificate
2007-07-10
2007-07-10
Kastler, Scott (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
With measuring, testing, or sensing
C073S789000
Reexamination Certificate
active
10732130
ABSTRACT:
A nondestructive evaluating method for aged deterioration in austenitic stainless steel comprises an information obtaining step for previously obtaining a relationship between an applied stress σ and the first ratio Ms/χH* between a saturation magnetization Ms and a pseudo susceptibility χH* based on reference minor hysteresis loops obtained by applying stresses σ, respectively, correspondingly to a result of a tensile test for the same kind of material as an evaluation target. In a measuring step, values of the first ratio Ms/χH* are obtained as measured values from measured minor hysteresis loops obtained by measuring the evaluation target. In an evaluating step, the relationship between the applied stress σ and the first ratio Ms/χH* is compared with the measured values, thereby evaluating aged deterioration of the evaluation target. The minor loops are obtained by stepwise changing a magnetic field amplitude Hawithin a range of a magnetic field intensity lower than a saturation magnetization.
REFERENCES:
patent: 5059903 (1991-10-01), Otaka et al.
patent: 5142227 (1992-08-01), Fish
patent: 6633159 (2003-10-01), Robar et al.
patent: 6868735 (2005-03-01), Takahashi
patent: 1 098 194 (2001-05-01), None
patent: WO 99/24803 (1999-05-01), None
S. Chifan, et al., Evaluation of Fatigue State of Ferromagnetic Steels by Magnetic Methods, 15 WCNDT, ′Online! 2000, pp. 1-4, Dec. 2000.
S. Takahashi, et al., Magnetization curves of plastically deformed Fe metals and alloys, Journal of Applied Physics vol. 87, No. 2, Jan. 15, 2000, pp. 805-813.
Iwate University
Kastler Scott
Knobbe Martens Olson & Bear LLP
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