# US 2020/0399747 A1 · Laminate shaped article, method for manufacturing the same, and metal powder for laminate shaping

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- Number: US 2020/0399747 A1
- Document ID: US20200399747A1
- Status: Published application
- Kind: A1
- Application number: 16/767,111
- Filed: 2018-12-17
- Published: 2020-12-24
- Earliest claimed: 2017-12-18
- Assignees: Hitachi Metals, Ltd.
- Applicants: Hitachi Metals, Ltd.
- Inventors: Norihide FUKUZAWA; Koichi Sakamaki; Yousuke NAKANO; Kousuke KUWABARA; Shiho FUKUMOTO; Kazuya SAITO
- Web page: https://patentgrep.com/patent/US20200399747A1

## CPC

- C22C 38/06: containing aluminium
- B22F 1/142: Thermal or thermo-mechanical treatment
- B22F 5/007: {of moulds}
- B22F 10/28: Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
- B22F 10/36: of energy beam parameters
- B33Y 10/00: Processes of additive manufacturing
- B33Y 40/20: Post-treatment, e.g. curing, coating or polishing
- B33Y 70/00: Materials specially adapted for additive manufacturing
- B33Y 80/00: Products made by additive manufacturing
- C21D 1/26: Methods of annealing
- C21D 1/78: Combined heat-treatments not provided for above
- C22C 33/0285: {with Cr, Co, or Ni having a minimum content higher than 5%}
- C22C 38/08: containing nickel {(C22C38/105 takes precedence)}
- C22C 38/105: {containing Co and Ni}
- C22C 38/12: containing tungsten, tantalum, molybdenum, vanadium, or niobium
- C22C 38/14: containing titanium or zirconium
- B22F 9/082: {atomising using a fluid (using centrifugal force B22F9/10)}
- B22F 10/32: of the atmosphere, e.g. composition or pressure in a building chamber
- B22F 10/366: Scanning parameters, e.g. hatch distance or scanning strategy
- B22F 10/64: by thermal means (control of energy beam parameters for post heating B22F10/364)
- B22F 2301/35: Iron
- B22F 2304/10: Micron size particles, i.e. above 1 micrometer up to 500 micrometer
- C21D 2211/004: Dispersions; Precipitations
- Y02P 10/25: Process efficiency
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Provided are a laminate shaped article made of a maraging steel and having excellent toughness, a method for manufacturing the same, and a metal powder for laminate shaping. The laminate shaped article is made of a maraging steel comprising 0.1-5.0 mass % of Ti. When sis is performed on concentration distribution of Ti in a cross section parallel to a lamination direction of the above laminate shaped article, a length of a linear Ti-rich portion having a Ti concentration B of (1.5×A) or more with respect to an average Ti concentration A in the cross section is 15 μm or less. In addition, the method for manufacturing the laminate shaped article uses a metal powder made of a maraging steel comprising 0.1-5.0 mass % of Ti, and a heat source output is set to 50-330 W and a scanning speed is set to 480-3000 mm/sec during the laminate shaping.

## Claims

### Claim 1

A laminate shaped article made of a maraging steel, the maraging steel is made of a component composition as following by mass %: C: 0.1% or less, Ni: 14-22%, Co: 0-5%, Mo: 0.1-15.0%, Ti: 0.1-5.0%, Al: 3.0% or less, and the balance comprising Fe and impurities, wherein
when surface analysis is performed on concentration distribution of Ti in a cross section parallel to a lamination direction of the laminate shaped article, a length of a linear Ti-rich portion having a Ti concentration B of (1.5×A) or more with respect to an average Ti concentration A in the cross section is 15 μm or less.

### Claim 2 (depends on 1)

The laminate shaped article according to claim 1, wherein the hardness is 40-60 HRC.

### Claim 3

(canceled)

### Claim 4

(canceled)

### Claim 5

A method for manufacturing laminate shaped article forming an article by a laminate shaping step in which an operation of spreading a metal powder made of a maraging steel on a stage and an operation of scanning and irradiating a heat source on the metal powder spread on the stage are repeatedly performed, the maraging steel is made of a component composition as following by mass %: C: 0.1% or less, Ni: 14-22%, Co: 0-20%, Mo: 0.1-15.0%, Ti: 0.1-5.0%, Al: 3.0% or less, and the balance comprising Fe and impurities, wherein
a heat source output is 250-330 W and a scanning speed is 480-3000 mm/sec when the heat source is scanned and irradiated on the metal powder.

### Claim 6 (depends on 5)

The method for manufacturing laminate shaped article according to claim 5 in which a heat treatment step including a solution treatment and an aging treatment is further performed on the article formed in the laminate shaping step.

### Claim 7 (depends on 5)

The method for manufacturing laminate shaped article according to claim 5, wherein the maraging steel has a Co content of 0-5 by mass %.

### Claim 8

(canceled)

### Claim 9

A metal powder for laminate shaping, which is made of a maraging steel and has a median diameter D50 of 200 μm or less, the maraging steel is made of a component composition as following by mass %: C: 0.1% or less, Ni: 14-22%, Co: 0-5%, Mo: 0.1-15.0%, Ti: 0.1-5.0%, Al: 3.0% or less, and the balance comprising Fe and impurities.

### Claim 10

(canceled)

### Claim 11

(canceled)

### Claim 12 (depends on 9)

The metal powder for laminate shaping according to claim 9, wherein the maraging steel has a Ti content of 0.5 or more by mass %.

### Claim 13 (depends on 9)

The metal powder for laminate shaping according to claim 9, wherein the maraging steel has a Ti content of 4.0 or less by mass %.

### Claim 14 (depends on 9)

The metal powder for laminate shaping according to claim 9, wherein the maraging steel has a Mo content of 10.0 or less by mass %.

### Claim 15 (depends on 9)

The metal powder for laminate shaping according to claim 9, wherein the maraging steel has a Mo content of 5.0 or less by mass %.

### Claim 16 (depends on 9)

The metal powder for laminate shaping according to claim 9, wherein the maraging steel has a Al content of 1.0 or less by mass %.

### Claim 17 (depends on 9)

The metal powder for laminate shaping according to claim 9, wherein the maraging steel has a Al content of 0.5 or less by mass %.

### Claim 18 (depends on 9)

The metal powder for laminate shaping according to claim 9, wherein the maraging steel has a Co content of 0.1 or more by mass %.