ALLOY COMPOSITIONS
The present disclosure provides compositions comprising iron, about 0.01 to about 0.4% w/w of manganese; about 1.3 to about 1.9% w/w of chromium; about 0.10% w/w or less of nickel; about 1.2 to about 1.7% w/w of molybdenum; about 0.01 to about 0.4% w/w of niobium; about 0.01 to about 0.4% w/w of vanadium; about 1.5 to about 2% w/w of silicon; and about 0.01 to about 0.20% w/w of carbon. The present disclosure also provides methods of preparing a metal powder, comprising atomizing a composition described herein and methods of preparing a metal object, comprising subjecting metal powder described herein to metal binder jetting.
1 . A composition comprising iron and:
about 0.01 to about 0.4% w/w of manganese;
about 1.3 to about 1.9% w/w of chromium;
about 0.1% w/w or less of nickel;
about 1.2 to about 1.7% w/w of molybdenum;
about 0.01 to about 0.4% w/w of niobium;
about 0.01 to about 0.4% w/w of vanadium;
about 1.5 to about 2% w/w of silicon; and
about 0.01 to about 0.20% w/w of carbon.
2 . The composition of claim 1 , comprising 0% w/w of nickel.
3 . The composition of claim 1 , comprising about 0.04 to about 0.1% w/w of nickel.
4 . The composition of claim 1 , comprising about 0.1 to about 0.3% w/w of manganese.
5 . The composition of claim 1 , comprising about 1.4 to about 1.8% w/w of chromium.
6 . The composition of claim 1 , comprising about 1.3 to about 1.6% w/w of molybdenum.
7 . The composition of claim 1 , comprising about 0.1 to about 0.3 w/w of niobium.
8 . The composition of claim 1 , comprising about 0.1 to about 0.3 w/w of vanadium.
9 . The composition of claim 1 , comprising about 1.5 to about 1.8% w/w of silicon.
10 . The composition of claim 1 , comprising about 0.05 to about 0.14% w/w of carbon.
11 . The composition of claim 1 , further comprising sulfur.
12 . The composition of claim 11 , comprising about 0.001 to about 0.015% w/w of sulfur.
13 . The composition of claim 1 , further comprising oxygen.
14 . The composition of claim 13 , comprising about 0.01 to about 0.1% w/w of oxygen.
15 . The composition of claim 1 , further comprising nitrogen.
16 . The composition of claim 15 , comprising about 0.01 to about 0.02% w/w of nitrogen.
17 . The composition of claim 1 , that is a metal powder.
18 . The composition of claim 1 , having a d 10 particle size of about 1 to about 10μ, a d 50 particle size of about 10 to about 20μ, or a d 90 particle size of about 20 to about 30μ, or combinations thereof.
19 . A method of preparing a metal powder, comprising atomizing the composition of claim 1 .
20 . The method of claim 19 , wherein the atomizing is gas or water atomizing.
21 . A metal powder prepared according to the method of claim 19 .
22 . The metal powder of claim 21 , having a d 10 particle size of about 1 to about 10μ, a d 50 particle size of about 10 to about 20μ, or a d 90 particle size of about 20 to about 30μ, or combinations thereof.
23 . A method of preparing a metal object, comprising subjecting the metal powder of claim 19 to metal binder jetting.
24 . The method of claim 23 , comprising depositing two or more layers comprising the metal working composition of claim 1 onto a substrate.
25 . The method of claim 24 , wherein the layers are bound together using a liquid binding agent.
26 . The method of claim 23 , further comprising sintering the metal object.
27 . The method of claim 26 , wherein the metal object is sintered at a temperature region at which the crystal structure of the alloy is body centered cubic (BCC) ferrite.
28 . The method of claim 26 , wherein the sintered metal object comprises an about 1:1 ratio of BCC to face centered cubic austenite (FCC).
29 . The method of claim 26 , wherein the sintering temperature is about 700 to about 1500° C.
30 . The method of claim 26 , wherein the density of the sintered metal object is at least about 7 g/cm 3 .
31 . The method of claim 26 , wherein the sintered metal object is annealed.
32 . The method of claim 31 , wherein the intercritical annealing temperature is about 600 to about 1000° C.
33 . A metal object prepared according to the method of claim 23 .