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US 11,725,264 B2Granted
High hardness 3D printed steel product
AssigneeVBN Components AB
InventorUlrik Beste
Life of this patent
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Abstract
The present invention relates to a 3D-printed iron based alloy product comprising carbon, tungsten, vanadium, cobalt, chromium and molybdenum with very high hardness and very good high temperature properties thermal properties as well as a method of preparing the 3D-printed product and a powder alloy.
Claims16
A 3D-printed product made of an alloy comprising a metal matrix and grains of carbides embedded in the metal matrix;
- wherein the alloy comprises
- Carbon:
- equal to or greater than 2.47 and equal to or less than 2.55 weight %,
- Tungsten:
- equal to or greater than 10 and equal to or less than 12 weight %,
- Chromium:
- equal to or greater than 3.5 and equal to or less than 4.5 weight %
- Cobalt:
- equal to or greater than 14 and equal to or less than 18 weight %;
- Molybdenum:
- equal to or greater than 4 and equal to or less than 6 weight %;
- Vanadium:
- equal to or greater than 5 and equal to or less than 8 weight %;
- Iron:
- balance;
- wherein the oxygen content is 30 ppm or less;
- wherein the total amount of carbide is 20-30 volume %;
- and
- wherein the maximum carbide size is less than 10 μm.
16 more elements
A method of preparing a 3D-printed product in a free forming apparatus having a chamber comprising:
- a. forming a layer of a powder of an iron based alloy in an oxygen-low environment in the chamber wherein the alloy comprises:
- Carbon:
- equal to or greater than 2.47 and equal to or less than 2.55 weight %,
- Tungsten:
- equal to or greater than 10 and equal to or less than 12 weight %,
- Chromium:
- equal to or greater than 3.5 and equal to or less than 4.5 weight %
- Cobalt:
- equal to or greater than 14 and equal to or less than 18 weight %;
- Molybdenum:
- equal to or greater than 4 and equal to or less than 6 weight %;
- Vanadium:
- equal to or greater than 5 and equal to or less than 8 weight %;
- unavoidable amounts of impurities;
- Iron:
- balance;
- and
- wherein the powder comprises spherical particles;
- b. melting the powder locally by exposing the powder to an energy beam during a sufficient period of time to form a melt pool;
- and
- c. letting the melted powder in the melt pool solidify into a multiphase alloy;
- d. optionally preparing an additional layer of powder on top of a previous layer by repeating the steps a-c wherein step a comprises placing the powder on top of the previous layer;
- and wherein the product being built is kept heated above 600° C. during the method
- e. optionally hardening of the obtained product.
21 more elements
Dependencies are inferred from the claim text.