渦電流法によるオーステナイトステンレス鋼の粒界腐食測定法について

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  • Eddy Current Method for Evaluation of Intergranular Corrosion in Austenitic Stainless Steel
  • ウズデンリュウホウ ニ ヨル オーステナイトステンレス コウ ノ リュウカイ フショク ソクテイホウ ニ ツイテ

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説明

The majority of methods for evaluating intergranular corrosion are destructive and qualitative.<br>Quantitative and nondestructive tests for evaluating intergranular corrosion have been a longstanding interest both for precision work in the laboratory and also for the inspection of the costly equipment and machinery already in service.<br>An attempt has been shown in this paper to employ the eddy current principle for the development of nondestructive test equipments for the quantitative assessment of intergranular penetration suitable for stainless steel.<br>Special designing of an instrument could be successfully made which was capable of indicating direct meter reading for the quantitative assessment of intergranular penetration in type SUS 27 or 32 austenitic stainless steel.<br>Standardization of the instruments was made under varied experimental conditions and it was found that the various factors such as chemical composition, cold working, thickness of the specimen had great influence, while degree of surface roughness and nature of oxide film had negligible influence on the measurement.

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