改良型ＨＰ系耐熱鋳鋼の経年使用材の補修溶接割れ　２　　長時間時効に伴う改良型ＨＰ系耐熱鋳鋼の組織変化

DOI

書誌事項

タイトル別名
  • Changes in Microstructure of HP-Modified Heat-Resisting Cast Alloys with Long Term Aging. Repair Weld Cracking of Long Term Exposed HP-Modified Heat-Resisting Cast Alloys. (Report 2).
  • Repair Weld Cracking of Long Term Exposed HP-Modified Heat-Resisting Cast Alloys (Report 2)
  • 改良型HP系耐熱鋳鋼の経年使用材の補修溶接割れ(第2報)

抄録

Changes in microstructures of modified HP-type heat-resistant cast alloys with long term aging were investigated using the as cast, artificially aged and practically used alloys at the elevated temperature. The microscopic observation and the X -ray diffraction analysis for microconstituents in heat-treated alloys were conducted in order to clarify the changes in morphologies and phases of microconstituents with heat treatment. In the niobium containing alloys, chromium-rich carbide of M7C3 and niobium carbide (NbC) changed to M23C6 and nickel-niobium silicide (7 phase) with long term aging, respectively. On the other hand, only chromium-rich carbide (M7C3 or M23C6) precipitated in as cast condition in the niobium-free alloys and the transformation of M7C3→ M23C6 or M23C6+nickel-rich silicide (G phase) occurred in the long term aging situation. The lamellar structure of eutectic microconstituents in the as cast alloy tended to agglomerate and coarsen with aging, and finally linked forming a continuous network surrounding the cellular dendrite boundaries. Zr addition to the HP cast alloy made it possible to reduce the microconstituents on the dendrite boundary due to the refinement of dendritic cell.

収録刊行物

キーワード

詳細情報 詳細情報について

  • CRID
    1390001204722148608
  • NII論文ID
    130003764644
  • DOI
    10.2207/qjjws.18.449
  • 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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