Martensitic stainless steel strengthened by ni3ti eta-phase...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/44 (2006.01) C22C 38/50 (2006.01) C22C 38/52 (2006.01)

Patent

CA 2594719

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.

Selon la présente invention, un acier maraging inoxydable durci par précipitation présentant un mélange de résistance, de dureté et de résistance à la corrosion renferme en pourcentage en poids entre environ 8 et 15 de chrome (Cr), entre 2 et 15 de cobalt (Co), entre 7 et 14 de nickel (Ni) et jusqu'à environ 0,7 d'aluminium (Al), moins d'environ 0,4 de cuivre (Cu), entre 0,5 et 2,5 de molybdène (Mo), entre 0,4 et 0,75 de titane (Ti), jusqu'à environ 0,5 de tungstène (W) et jusqu'à environ 120wppm de carbone (C), le reste constituant essentiellement du fer (Fe) et des éléments incidents et des impuretés. Cet acier est caractérisé en ce que l'alliage présente une microstructure de martensite principalement en bâtonnet, essentiellement sans phases intermétalliques topologiquement très proches et durcies primairement par une dispersion de particules intermétalliques de la phase eta-Ni3Ti. Les niveaux de titane (Ti) et de carbone (C) sont régulés de telle manière que le carbone (C) peut être dissous au cours d'une étape d'homogénéisation et, par conséquent, précipité pendant le forgeage, afin d'améliorer une dispersion d'ancrage de grains.

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