Ni-Ti系形状記憶合金の高温水中における応力腐食割れ

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タイトル別名
  • Stress Corrosion Behavior of Ni-Ti Shape Memory Alloys in High Temperature Water
  • Ni Tiケイ ケイジョウ キオク ゴウキン ノ コウオンスイチュウ ニ オケ

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The effects of composition, heat treatment, test temperature and dissolved oxygen (DO) concentration on the stress corrosion cracking (SCC) behavior of Ni-Ti and Ni-Ti-Cu shape memory alloys in high temperature pure water were examined. The tests were conducted by using slow strain rate test machine.<BR>The 50∼50.9 at%Ni-Ti and 40∼41.5 at%Ni-Ti-10 at%Cu shape memory alloys were subjected to SCC in air saturated water of 561 K, except for the annealed 50 at%Ni-Ti alloy. The annealed 50 at%Ni-Ti was immune to SCC, but the SCC susceptibilities of the other Ni-Ti alloys were not affected by nickel concentration and heat treatment. In the case of Ni-Ti-Cu alloys both low nickel concentration and aging promoted SCC. SCC of Ni-Ti and Ni-Ti-Cu alloys initiated from the scratches and propagated transgranularly.<BR>At 473 K, SCC occurred and the susceptibilities were not largely different from those at 561 K. In the case of a stainless steel shape memory alloy, the martensite phase specimens were susceptible to SCC in deaerated low temperature water. On the contrary, the martensitic Ni-Ti alloys did not crack in the deaerated water at 287 K.<BR>The susceptibilities to SCC of Ni-Ti and Ni-Cu-Ti alloys in deaerated water of 561 K were the same as those in aerated water of the same temperature. Dissolved oxygen did not accelerate nor prevent SCC in high temperature water.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 60 (6), 577-581, 1996

    公益社団法人 日本金属学会

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