Ｎｉ基合金の多層盛溶接金属におけるミクロ割れの研究　（第２報）　Ｎｉ‐Ｃｒ‐Ｆｅ三元系合金の再熱溶接金属の延性低下割れ感受性に及ぼすＣｒ及びＳの影響

DOI

書誌事項

タイトル別名
  • Study on Microcracks in Multi-pass Weld Metals of Ni-base Alloys(Part 2). Effects of Cr and S on Ductility-dip Cracking Susceptibility in Reheated Weld Metals of Ni-Cr-Fe Ternary Alloys.
  • Study on Microcracks in Multi-pass Weld Metals of Ni-base Alloys (Part 2)
  • Ni基合金の多層盛溶接金属におけるミクロ割れの研究(第2報)

抄録

Hot ductility testing of weld metal was performed in order to make clear the mechanism of ductility-dip cracking in weld metal of 70%Ni-Cr-Fe ternary alloys containing 0.007%S in which Cr contents were varied from 0 to 20%. The temperature range of testing was varied from 873 to 1473 K. Microstructures and fracture surfaces were also examined.<BR>The ductility at 1173 K of Ni-10%Cr-20%Fe alloy was higher than those of Ni-30%Fe and Ni-20% Cr-10%Fe alloys. It followed that these ductilities were related to the ductility-dip cracking. Fracture modes of this testing samples were almost intergranular fracture. According to the microstructure examination, grain boundary carbides, M23C6 appeared in only Ni-20%Cr-10%Fe alloy weld metal at the temperature of 1173 K. Hardness in weld metal increased with an increase in Cr content. On the other hand, increasing in holding time at 873 K decreased a ductility of the base metal of Ni-30%Fe containing 0.007%S at 873 K. It followed that S easily segregated on grain boundary in low Cr alloy. These results meant that optimum Cr content in weld metal was necessary in order to reduce the ductility-dip cracking susceptibility because of contrary effects due to grain boundary carbide, hardness and grain boundary segregation of S.

収録刊行物

キーワード

詳細情報 詳細情報について

  • CRID
    1390282679700488064
  • NII論文ID
    130003934277
  • DOI
    10.2207/qjjws.11.108
  • ISSN
    24348252
    02884771
  • 本文言語コード
    ja
  • データソース種別
    • JaLC
    • Crossref
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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