发明公开
EP1848836A2 MARTENSITIC STAINLESS STEEL STRENGHTENED BY NI3 TI N-PHASE PRECIPITATION 审中-公开
马氏体不锈钢硬化BY NI3-TI-N-PHASE消除

  • 专利标题: MARTENSITIC STAINLESS STEEL STRENGHTENED BY NI3 TI N-PHASE PRECIPITATION
  • 专利标题(中): 马氏体不锈钢硬化BY NI3-TI-N-PHASE消除
  • 申请号: EP06733960.6
    申请日: 2006-01-25
  • 公开(公告)号: EP1848836A2
    公开(公告)日: 2007-10-31
  • 发明人: WRIGHT, James, A.JUNG, Jin-Won
  • 申请人: Questek Innovations LLC
  • 申请人地址: 1820 Ridge Avenue Evanston, IL 60201 US
  • 专利权人: Questek Innovations LLC
  • 当前专利权人: Questek Innovations LLC
  • 当前专利权人地址: 1820 Ridge Avenue Evanston, IL 60201 US
  • 代理机构: Mohun, Stephen John
  • 优先权: US646805P 20050125
  • 国际公布: WO2006081401 20060803
  • 主分类号: C22C38/44
  • IPC分类号: C22C38/44
MARTENSITIC STAINLESS STEEL STRENGHTENED BY NI3 TI N-PHASE PRECIPITATION
摘要:
A precipitation-hardened stainless maraging steel which exhibits a combination of strength, toughness, and corrosion resistance comprises by weight about: 8 to 15% chromium (Cr), 2 to 15% cobalt (Co), 7 to 14% nickel (Ni), and up to about 0.7% aluminum (Al), less than about 0.4% copper (Cu), 0.5 to 2.5% molybdenum (Mo), 0.4 to 0.75% titanium (Ti), up to about 0.5% tungsten (W), and up to about 120wppm carbon (C), the balance essentially iron (Fe) and incidental elements and impurities, characterized in that the alloy has a predominantly lath martensite microstructure essentially without topologically close packed intermetallic phases and strengthened primarily by a dispersion of intermetallic particles primarily of the eta-Ni3Ti phase and wherein the titanium and carbon (Ti) and (C) levels are controlled such that C can be dissolved during a homogenization step and subsequently precipitated during forging to provide a grain- pinning dispersion.
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