Tritium and Decay Helium Effects on the Fracture Toughness Properties of Types 316L, 304L and 21Cr-6Ni-9Mn Stainless Steels

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  • Tritium and Decay Helium Effects on the Fracture Toughness Properties of Types 316L, 304L and 21Cr-6Ni-9Mn Stainless Steels Book Detail

  • Author :
  • Release Date : 1994
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  • Pages : 12
  • ISBN 13 :
  • File Size : 59,59 MB
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Tritium and Decay Helium Effects on the Fracture Toughness Properties of Types 316L, 304L and 21Cr-6Ni-9Mn Stainless Steels by PDF Summary

Book Description: J-integral fracture mechanics techniques and electron microscopy observations were used to investigate the effects of tritium and its radioactive decay product, 3He, on Types 316L, 304L and 21Cr-6Ni-9Mn stainless steels. Tritium-exposed-and-aged steels had lower fracture-toughness values and shallower sloped crack-growth-resistance curves than unexposed steels. Both fracture-toughness parameters decreased with increasing concentrations of 3He. The fracture-toughness reductions were accompanied by a change in fracture mode from microvoid-nucleation-and-growth processes in control samples to grain-and-twin-boundary fracture in tritium-charged-and-aged samples. Type 316L stainless steel had the highest fracture-toughness values and Type 21Cr-6Ni-9Mn had the lowest. Samples containing 3He but degassed of tritium had fracture toughness properties that were similar to uncharged samples. The results indicate that helium bubbles enhance the embrittlement effects of hydrogen by affecting the deformation properties and by increasing localized hydrogen concentrations through trapping effects.

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Hydrogen Effects in Materials

Hydrogen Effects in Materials

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Proceedings of the Fifth International Conference on the Effect of Hydrogen on the Behavior of Materials sponsored by the Structural Materials Division (SMD) Me