The Effects of .DELTA.-Ferrite Morphology on Low Temperature Fracture Toughness of Austenitic Stainless Steel Weld Metal.

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  • オーステナイト系ステンレス鋼溶接金属の低温靭性に及ぼすδフェライト形態の影響

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The effect of δ ferrite morphology and grain boundary property on the low temperature toughness of austenitic stainless steel SUS304L weld metal has been studied. The types of δ ferrite were classified into three categories : vermicular, lacy, and globular. When Charpy test were performed at low temperature, brittle fracture easily occurred in a vermicular type δ ferrite because the longitudinal direction of this δ perallel to [100]δ, that is a cleavage plain.<BR>On the other hand, brittle fracture scarcely occurred in both a globular type and a lacy type δ ferrite, because the the stress concentration must be low at globular type δ and the Kurdjumov-Sachs (K-S) relationship holds between lacy type δ and γ phase. Grain boundary holding the K-S are coherence to grains and hardly cause the decohesion.<BR>The present data indicate that changing the δ ferrite morphology from a vermicular type to lacy type prevents the cleavage fracture and increases the fracture toughness at low temperature.

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Details 詳細情報について

  • CRID
    1390282679700406016
  • NII Article ID
    130003935106
  • DOI
    10.2207/qjjws.9.525
    10.1080/09507119209548250
  • ISSN
    24348252
    02884771
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
    • OpenAIRE
  • Abstract License Flag
    Disallowed

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