G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/82 (2006.01) G01N 3/08 (2006.01) G01N 27/72 (2006.01) G01N 27/80 (2006.01) G01N 33/20 (2006.01)
Patent
CA 2452433
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 a arid the first ratio Ms/xH* between a saturation magnetization Ms and a pseudo susceptibility xH* based on reference minor hysteresis loops obtained by applying stresses .sigma., 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/xH* 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 6 and the first ratio Ms/xH* 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 Ha within a range of a magnetic field intensity lower than a saturation magnetization.
Iwate University
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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