高強度鋼の遅れ破壊特性に及ぼすSi, Caの複合添加の影響

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タイトル別名
  • Effect of Si and Ca Addition on Delayed Fracture of High-strength Steels
  • コウ キョウド コウ ノ オクレ ハカイ トクセイ ニ オヨボス Si Ca

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Effects of Si and Ca addition on delayed fracture of medium carbon steels with 1400N/mm2 strength were investigated. Silicon and calcium were added at concentrations of 02.0% and 3070ppm, respectively. The delayed fracture characteristics were evaluated by FIP (Fédération Internationale de la Précontrainte) test which is a constant tensile load test in 20% NH4SCN solution at 323 K. In order to make clear the effect of adding Ca and Si, the fracture surfaces were examined, and the hydrogen evolution behavior, the diffusion coefficient of hydrogen, and the hydrogen content were measured. It was found that 0.5%Si steels have no effect on the time to fracture regardless of Ca content, while 1.5%Si-30ppm Ca steel has the longest time to fracture. Fractography showed that adding Ca to 0.5%Si steels did not change the intergranular fracture area fraction. However, adding Ca to 1.5%Si steels changed the fracture from intergranular fracture to microvoid coalescence fracture. As for hydrogen behavior after three months from FIP test, 0.5%Si steel released hydrogen at the peak of 500 K, while for the 1.5%Si-30ppm Ca steel the peak was at 700 K. It was suggested that hydrogen released at around 500 K was crucial for delayed fracture characteristics.

収録刊行物

  • 鉄と鋼

    鉄と鋼 79 (6), 685-691, 1993

    一般社団法人 日本鉄鋼協会

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