M&M材料力学カンファレンス
Online ISSN : 2424-2845
セッションID: OS1308
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OS1308 SUS304鋼の3.5%NaCl溶液中における腐食疲労寿命におよぼす加工誘起マルテンサイトの影響
矢津 拓実小野 貴史藤原 弘宮本 博之松村 昌敏
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会議録・要旨集 フリー

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抄録
Metastable SUS304 steels were cyclically deformed in tension/compression in aqueous 3%NaCl solution in order to clarify the influence of deformation-induced-martensite (DIM) on the corrosion fatigue life in a pitting-forming environment. The number of cycles to failure, N_f increased with decreasing plastic strain amplitude, dε_<p1>. However, under dε_<p1> of 0.3%, the N_f increased in higher rate in terms of dε_<p1>. DIM was not detected after the fatigue test at dε_<p1> smaller than 0.3% while the volume fraction of DIM increased with increasing dε_<p1> at higher than 0.3%. Pitting was observed after the fatigue tests at dε_<p1> larger than 0.4% and increased with increasing DIM, suggesting that the formation of pitting was caused by DIM. Thus, the formation of DIM facilitates pitting and reduces corrosion fatigue life.
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© 2012 一般社団法人 日本機械学会
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