Fe-Ni-Ti系マルエージング鋼の析出挙動と切欠靭性に及ぼすCrの影響

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  • Effects of Chromium on the Precipitation Behavior and Notch Toughness of Fe-Ni-Ti Maraging Steels
  • Fe Ni Tiケイ マルエージング

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In the steels with composition of Fe-10Ni-3Cr-1.5Ti, the severe embrittlement occurred with the progress of aging regardless of presence of molybdenum. The embrittlement is not thought to be caused by grain boundary segregation of impurities giving rise to temper embrittlement in low alloy steels. The relationship between the embrittlement and precipitation behavior was studied in consideration of “activation energies” determined from Arrhenius plots. It is suggested that the embrittlement in these steels results from the formation of low temperature precipitates associated with the presence of titanium.<BR>Also in the steel with composition of Fe-14Ni-2Mo-1.5Ti, the severe embrittlement occurred with the progress of aging as well as in the steels with composition of Fe-10Ni-3Cr-1.5Ti. When chromium is added to Fe-14Ni-2Mo-1.5Ti, the steel shows a good toughness even after the progress of aging. It was found that addition of chromium suppressed the formation of low temperature precipitates associated with the presence of titanium produced at an early stage of aging and promoted the formation of Laves phase produced with the progress of aging.<BR>It is presumed that a close relationship exists between the precipitation behaviors and the notch toughness.

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  • 日本金属学会誌

    日本金属学会誌 50 (10), 879-886, 1986

    公益社団法人 日本金属学会

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