高Mn-Crオーステナイト鋼の液体ヘリウム温度における靱性

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タイトル別名
  • Toughness of High Manganese-Chromium Austenitic Steels at Liquid Helium Temperature
  • コウ Mn Cr オーステナイト コウ ノ エキタイ ヘリウム オンド ニ オ

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抄録

In order to examine the applicability of high manganese-chromium austenitic steels to cryogenic use, Charpy impact test was made at liquid helium temperature. A steel with 25Mn-5Cr-1Ni as base composition exhibited good toughness in impact testing without any sign of martensite transformation induced by impact deformation.<BR>Niobium bearing steel, which was grain-refined, showed slightly lower impact energy. The cause for this was considered to be the local strain hardening in fine-grained steel, in which the mode of crack propagation was changed. Increment of nickel content to the material with base composition increased toughness. 15Mn-5Cr-5Ni steel exhibited good toughness even though the trace of martensite transformation caused by low stability of austenite was found. As the results above, it was shown that 25Mn-5Cr-1Ni austenitic steels have an applicability to cryogenic use.

収録刊行物

  • 鉄と鋼

    鉄と鋼 65 (6), 681-686, 1979

    一般社団法人 日本鉄鋼協会

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