ボロン処理した Cr-Mo-Nb 鋼の強度・靱性に及ぼす Si の影響

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  • 津村 輝隆
    住友金属工業(株)総合技術研究所(現:住友金属工業(株)小倉製鉄所)
  • 岡田 康孝
    住友金属工業(株)総合技術研究所 工博
  • 大谷 泰夫
    住友金属工業(株)総合技術研究所 工博

書誌事項

タイトル別名
  • Effect of Si on the Strength and the Toughness of Boron Treated Cr-Mo-Nb Steels
  • ボロン処理したCr-Mo-Nb鋼の強度・靭性に及ぼすSiの影響
  • ボロン ショリシタ Cr Mo Nb コウ ノ キョウド ジンセイ ニ オヨボ

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抄録

Effect of Si content on the various mechanical properties and microstructures in B-treated Cr-Mo-Nb steels has been investigated.<BR>1) By increasing Si content, Charpy transition temperature of shear area (vTrsraises due to solution hardening and coarsening of austenite grain size, when coarse boro-carbides are not formed along grain boundaries during tempering treatment at high temperature.<BR>2) Si suppresses the coarsening of intergranular boro-carbides in case of high temperature tempering. As a result, in a steel containing excess dissolved B and so having boro-carbides along grain boundaries, it is considered that Si does not change vTrs spite of solution hardening and coarsening of austenite grain size due to increase of Si content.<BR>3) In an as quenched condition, austenite grain boundaries in a low Si content steel are clearly revealed, but those in a high Si content steel are not clearly observed after conventional etching. Consequently, it is considered that Si affects the grain boundary segregation.

収録刊行物

  • 鉄と鋼

    鉄と鋼 73 (1), 199-206, 1987

    一般社団法人 日本鉄鋼協会

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