鉄と鋼
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
下限界応力拡大係数KISCCのAEによる評価
野末 章岸 輝雄堀内 良
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1981 年 67 巻 10 号 p. 1787-1794

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In this paper, a new method to evaluate the threshold stress-intensity factor KISCC by the use of acoustic emission (AE) signal analysis is proposed using the material of type 4340 steel, of which hydrogen content was controlled by the cathodic electrolytic method. In the subcritical crack growth due to hydrogen embrittlement, a linear correlation was observed between stress-intensity factor K and emission event counts N. From this relation KISCC was defined as a stress-intensity factor KAE corresponding to the generation of AE events. The effects of K and threshold voltage of AE measurement on the KISCC were discussed in detail, and with the results of fractography it was concluded that the obtained KISCC corresponded to the nucleation of hydrogen induced intergranular microcrack in the maximum triaxial stress field ahead of the crack tip.

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© 一般社団法人 日本鉄鋼協会
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