摘要：
A metal powder for additive manufacturing, comprising, in wt%, Ni 9.0–12.0, Cr 2.0–4.5, Mo 3.5–4.5 and Ti 0.1–1.0; and, if present, Si up to 0.5, Mn up to 0.5, Al up to 0.1, Co up to 0.1, N up to 0.05 and/or C up to 0.07; the balance being Fe and usual impurities. Use of the metal powder for additive manufacturing. A process for producing an object by additive manufacturing, comprising building an object by iteratively melting particles of the metal powder and solidifying the melt, and subsequently aging the built object without any preceding solution annealing thereof.
权利要求：
CLAIMS
1 . A metal powder for additive manufacturing, comprising, in wt%, Ni 9.0-12.0,
Cr 2.0-4.5,
Mo 3.5-4.5 and
Ti 0.1-1.0; and, if present,
Si up to 0.5,
Mn up to 0.5,
Al up to 0.1 ,
Co up to 0.1 ,
N up to 0.05 and/or
C up to 0.07; the balance being Fe and usual impurities.
2. The metal powder according to claim 1 , wherein when 9.0 < Ni < 10.0: 7.2 < (Cr + Mo + Ti) < 8.9; when 10.0 < Ni < 11 .0: 6.5 < (Cr + Mo + Ti) < 8.2; when 11 .0 < Ni < 12.0: 5.6 < (Cr + Mo + Ti) < 7.5.
3. The metal powder according to claim 1 or 2, comprising, in wt%,
Ni 9.0-10.0,
Cr 3.0-3.5,
Mo 4.0-4.5 and
Ti 0.7-0.9; and, if present,
Si up to 0.4,
Mn up to 0.4,
Al up to 0.05,
Co up to 0.1 ,
N up to 0.05 and/or
C up to 0.03; the balance being Fe and usual impurities.
4. The metal powder according to anyone of the preceding claims, comprising, in wt%,
Ni 9.0-10.0,
Cr 3.0-3.5,
Mo 4.0-4.5,
Ti 0.7-0.9,
Si 0.2-0.4 and
Mn 0.2-0.4; and, if present,
Al up to 0.05,
Co up to 0.1 ,
N up to 0.05 and/or
C up to 0.03; the balance being Fe and usual impurities.
5. The metal powder according to anyone of the preceding claims, wherein the comprised elements are present as an alloy.
6. The metal powder according to anyone of the preceding claims, wherein at least 90 wt% of the powder has a particle size determined by sieving of lower than 500 pm, preferably of lower than 200 pm, more preferably wherein
- at least 90 wt% of the powder has a particle size of lower than 45 pm,
- at most 10 wt% of the powder has a particle size of lower than 15 pm and at least 90 wt% of the powder has a particle size of lower than 53 pm,
- at most 10 wt% of the powder has a particle size of lower than 45 pm and at least 90 wt% of the powder has a particle size of lower than 106 pm, and/or
- at most 10 wt% of the powder has a particle size of lower than 53 pm and at least 90 wt% of the powder has a particle size of lower than 150 pm.
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7. Use of a metal powder according to anyone of claims 1 to 6 for additive manufacturing.
8. Use according to claim 7, wherein the additive manufacturing is binder jetting, directed energy deposition or powder bed fusion, such as laser beam powder bed fusion or electron beam powder bed fusion, preferably powder bed fusion, more preferably laser beam powder bed fusion.
9. A process for producing an object by additive manufacturing, comprising building an object by iteratively
- melting particles of a metal powder according to anyone of claims 1 to 8 and
- solidifying the melt, and subsequently
- aging the built object without any preceding solution annealing thereof.
10. The process according to claim 9, wherein the aging is performed at a temperature in the range of 400-600 °C, preferably for a period of 3 to 8 hours.
11 . The process according to claim 10, wherein the aging is performed at a temperature in the range of 480-600 °C, preferably for a period of 3 to 5 hours.
12. The process according to anyone of claims 9 to 11 , wherein any heat treatment of the built object is performed at a temperature below 650 °C, preferably below 600 °C.
13. The process according to anyone of claims 9 to 12, wherein the melt is solidified at a cooling rate of 104— 106K/s.
14. The process according to anyone one of claims 9 to 13, wherein the additive manufacturing is directed energy deposition or powder bed fusion,
19 such as laser beam powder bed fusion or electron beam powder bed fusion, preferably powder bed fusion, more preferably laser beam powder bed fusion.