OS0517 局所接触負荷による高強度鋼の水素ぜい化破壊機構(微視構造を有する材料の変形と破壊,オーガナイズドセッション)

概要

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This study investigated hydrogen embrittlement cracking (HEC) in high strength steel subjected to contact loading using a Vickers indentation. When the indentation test was applied to the high strength steel, the steel absorbed hydrogen produced several cracks around the impression, while as-received steel without hydrogen absorption did not produce any cracks. An experimental/computational framework was employed to elucidate the mechanism of such indentation cracks due to hydrogen embrittlement. We utilized acoustic emission technique (AET) to clarify when the crack initiated during the test. In parallel with the experiment, finite element analysis (FEA) was carried out to compute the stress field surrounding the impression. Based on the results of AET and FEA, we discussed the mechanism of crack initiation and critical stress to nucleate the crack.
2009-07-24