Metal powder bonded body manufactured by additive manufacturing and having excellent hydrogen embrittlement resistance

Patent metadata

Field	Value
Publication number	US-2018015540-A1
Application number	US-201715652884-A
Country	US
Kind code	A1
Filing date	Jul 18, 2017
Priority date	Jul 18, 2016
Publication date	Jan 18, 2018
Grant date	—

Abstract

Provided is a metal powder bonded body having excellent hydrogen embrittlement resistance, wherein the metal powder bonded body is a metallic material having excellent hydrogen embrittlement resistance, the metallic material is a metal powder bonded body manufactured by incrementally adding metal powder layer by layer, and the metal powder bonded body has characteristics of ductile fracture in an area of 80% or more of a total area of a fracture section when fractured in a hydrogen atmosphere.

First claim

What is claimed is:

1 . A metal powder bonded body having excellent hydrogen embrittlement resistance,
wherein the metal powder bonded body is a metallic material having excellent hydrogen embrittlement resistance, the metallic material is a metal powder bonded body manufactured by incrementally adding metal powder layer by layer, and the metal powder bonded body has characteristics of ductile fracture in an area of 80% or more of a total area of a fracture section when fractured in a hydrogen atmosphere.

2 . A metal powder bonded body having excellent hydrogen embrittlement resistance,
wherein the metal powder bonded body is a metallic material having excellent hydrogen embrittlement resistance, the metallic material is a metal powder bonded body manufactured by incrementally adding metal powder layer by layer, and in the metal powder bonded body, a ratio of tensile strength TS2 after being exposed to hydrogen to tensile strength TS1 before being exposed to hydrogen satisfies Equation (1):
0.7< TS 2/ TS 1<1.1.  Equation (1):

3 . A metal powder bonded body having excellent hydrogen embrittlement resistance,
wherein the metal powder bonded body is a metallic material having excellent hydrogen embrittlement resistance, the metallic material is a metal powder bonded body manufactured by incrementally adding metal powder layer by layer, and in the metal powder bonded body, a ratio of elongation E2 after being exposed to hydrogen to elongation E1 before being exposed to hydrogen satisfies Equation (2):
0.7< E 2/ E 1<1.1.  Equation (2):

4 . A metal powder bonded body having excellent hydrogen embrittlement resistance,
wherein the metal powder bonded body is a metallic material having excellent hydrogen embrittlement resistance, the metallic material is a metal powder bonded body manufactured by incrementally adding metal powder layer by layer, and in the metal powder bonded body, a ratio of reduction of area RA2 after being exposed to hydrogen to reduction of area RA1 before being exposed to hydrogen satisfies Equation (3):
0.7< RA 2/ RA 1<1.1.  Equation (3)

5 . A metal powder bonded body having excellent hydrogen embrittlement resistance,
wherein the metal powder bonded body is a metallic material having excellent hydrogen embrittlement resistance, the metallic material is a metal powder bonded body manufactured by incrementally adding metal powder layer by layer, and in the metal powder bonded body, a difference between a fraction Mf of a martensite phase after completion of a tensile test in a state of being exposed to hydrogen and a fraction Mb of a martensite phase before being exposed to hydrogen satisfies Equation (4):
| Mf−Mb|≦ 10.  Equation (4):

6 . The metal powder bonded body having excellent hydrogen embrittlement resistance of claim 1 , wherein, in the characteristics of ductile fracture in the area of 80% or more of the total area of the fracture section, a fracture mode including dimples without a cleavage plane is shown in the area of 80% or more of the total fracture section during observation of the fracture section.

7 . The metal powder bonded body having excellent hydrogen embrittlement resistance of of claim 1 , wherein the metal powder comprises at least one of an iron alloy (including pure iron), steel, Ni-based alloy powder (including pure nickel (Ni)), Zr-based alloy powder (including pure zirconium (Zr)), W-based alloy powder (including pure tungsten (W)), rare earth metal powder, and transition metal powder.

8 . The metal powder bonded body having excellent hydrogen embrittlement resistance of claim 1 , wherein the metal powder includes 304L stainless steel powder.

9 . The metal powder bonded body having excellent hydrogen embrittlement resistance of claim 1 , wherein the metal powder bonded body comprises one in which single metal powder or heterogeneous metal powder is bonded.

10 . The metal powder bonded body having excellent hydrogen embrittlement resistance of claim 1 , wherein the metal powder bonded body comprises one in which metal powder and ceramic powder are bonded.

11 . The metal powder bonded body having excellent hydrogen embrittlement resistance of claim 1 , wherein the metal powder bonded body comprises one in which at least one of metal oxide, metal nitride, and metal carbide is present in a dispersed form in a metal matrix.

Assignees

• Korea Res Inst Standards & Sci

Inventors

• Baek Seung Wook
• Nahm Seung Hoon
• Baek Un Bong

Classifications

• F17C2203/0617

  with one layer · CPC title

• F17C2221/012

  Hydrogen · CPC title

• F17C2223/0123

  gaseous, e.g. CNG, GNC · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title

• C22C33/02

  by powder metallurgy · CPC title