Tough and wear resistant ferrous alloys containing multiple hardphases
AssigneeScoperta, Inc.
InventorsJustin Lee Cheney, Cameron Eibl
Life of this patent
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Abstract
Embodiments of wear resistant ferrous alloys are disclosed herein. In some embodiments, ferrous alloys can have a matrix which includes near spherical and hypereutectic borides and/or borocarbides while at the same time avoiding the formation of rod-like borides and/or borocarbides. In some embodiments, the wear resistant ferrous alloys can be used as a coating, such as a hardfacing layer, to add protection to different components.
Claims21
A ferrous alloy, the ferrous alloy configured to form a matrix comprising:
- near spherical and hypereutectic borides and/or borocarbides;
- wherein a volume fraction of the near spherical and hypereutectic borides and/or borocarbides is >5%, where a near spherical phase has an aspect ratio <2:1, the aspect ratio being defined as the ratio between a major axis in cross section to an orthogonal diameter of the near spherical and hypereutectic borides and/or borocarbides;
- wherein a volume fraction of hypereutectic and rod-like phases with a maximum dimension in cross section >50 μm and an aspect ratio greater than 2:1 is <5%;
- wherein a total volume fraction of borides and borocarbides is >10%;
- wherein the alloy comprises Fe and the following in wt %:
- B:
- 1.95-5.5;
- C:
- 0-2.08;
- Cr:
- 1.52-24;
- Mo:
- 2.9-22;
- Ti:
- 0-7.21;
- W:
- 0-19.2.
A wear resistant ferrous alloy comprising:
- a mole fraction of M2B or M3B2 at a liquidus of ≥5%, wherein M comprises Mo and W and where M is ≥15 wt % Mo+W;
- and
- a mole fraction of hypereutectic and rod like phases at the liquidus of ≤5%;
- wherein a total mole fraction of all borides and borocarbides at 1300K is ≥10%.
A ferrous alloy, the ferrous alloy configured to form a matrix comprising:
- one or more of ferrite, austenite, martensite, pearlite, and/or bainite;
- wherein a mole fraction, measured at 1300K, of borides with a metallic constituent of ≥75 wt % iron plus chromium is ≥5%;
- wherein a mole fraction, when measured at 1300K, of one or more carbides, borides, and/or borocarbides with a metallic constituent ≥75 wt % of one or more of Nb, Ti, V, Zr, W, Mo, Hf is ≥5%;
- and
- wherein a mole fraction of borides that are hyper eutectic and have a metallic constituent of ≥75 wt % iron plus chromium is ≤15%.
Dependencies are inferred from the claim text.