METHOD OF NONDESTRUCTIVE EXAMINATION OF CHROMIUM-CONTAINING NICKEL-BASED ALLOY FOR GRAIN BOUNDARY CORROSION AND EXAMINATION APPARATUS

Title:

METHOD OF NONDESTRUCTIVE EXAMINATION OF CHROMIUM-CONTAINING NICKEL-BASED ALLOY FOR GRAIN BOUNDARY CORROSION AND EXAMINATION APPARATUS

Document Type and Number:

WIPO Patent Application WO/2003/087804

Kind Code:

A1

Abstract:

Conventional methods of examining chromium-containing nickel-based alloys, such as Inconel 600 alloy, for chromium-deficient phases necessitate surface corrosion or cutting and hence are methods accompanied by destruction and contrary to the idea of nondestructive examination. The information obtainable with the methods has been limited to one concerning surface chromium-deficient phases. The method, which is for examining a chromium-containing nickel-based alloy for grain boundary corrosion based on thermal sensitization, comprises: measuring the saturation magnetization M_s(T_i) of a test piece at each of temperatures distributed at the same interval throughout the range of from the minimum to the maximum Curie temperatures corresponding to the chromium concentrations in the chromium-deficient phase of the alloy; and quantitatively determining the average spatial distribution of the chromium-deficient phase of the test piece, i.e., the volumes for respective chromium concentrations of the chromium-deficient phase at around grain boundaries, using a given arithmetic expression.

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Inventors:

TAKAHASHI SEIKI (JP)

Application Number:

PCT/JP2003/004581

Publication Date:

October 23, 2003

Filing Date:

April 10, 2003

Export Citation:

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Assignee:

JAPAN SCIENCE & TECH CORP (JP)
TAKAHASHI SEIKI (JP)

International Classes:

G01N27/82; G01N17/00; G01N27/72; G01N27/80; G01N33/20; (IPC1-7): G01N27/72

Foreign References:

JPS5542060A	1980-03-25
JPS54156697A	1979-12-10
JP2001141700A	2001-05-25
JPH0291980U	1990-07-20

Attorney, Agent or Firm:

Nishi, Yoshiyuki (Suite 211 26-32, Nakahara 4-chome, Isogo-k, Yokohama-shi Kanagawa, JP)

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