Alloy structure and method for producing alloy structure

Patent metadata

Field	Value
Publication number	US-10702944-B2
Application number	US-201515328280-A
Country	US
Kind code	B2
Filing date	Jul 17, 2015
Priority date	Jul 23, 2014
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

An alloy structure has an arbitrary shape dimension which has high uniformity in the distribution of the element composition. The alloy structure contains Fe and at least four elements, which are selected from the group consisting of elements from atomic number 13 to atomic number 79 included in Group 3 to Group 16 of the periodic table of the elements and have a ratio of the atomic radius to an Fe atom of 0.83 or more but 1.17 or less, each of Fe and the four elements is contained in an atomic concentration range of 5 at % or more but 30 at % or less, a difference in atomic concentration between at least four elements among the at least four elements and Fe is in a range of less than 3 at %, and the alloy structure has, a column crystal in which the at least four elements and Fe are solid-dissolved.

First claim

The invention claimed is:

1. An alloy structure comprising:
a column crystal that has an average grain size of 100 μm or less in which Fe and at least four elements other than Fe are solid-dissolved, wherein each of Fe and the at least four elements is contained in an atomic concentration range of 5 at % or more and 30 at % or less;
a main crystal of the column crystal that has a crystalline structure of a face-centered cubic lattice or a body-centered cubic lattice; and
an impurity,
wherein the impurity includes:
P in an amount between 0.002 wt % and 0.005 wt %,
Si in an amount between 0.010 wt % and 0.040 wt %,
S in an amount between 0.001 wt % and 0.002 wt %,
Sn in an amount between 0.002 wt % and 0.005 wt %,
Sb in an amount between 0.001 wt % and 0.002 wt %,
As in an amount between 0.001 wt % and 0.005 wt %,
Mn in an amount between 0.020 wt % and 0.050 wt %,
O in an amount between 0.0003 wt % and 0.001 wt %, and
N in an amount between 0.001 wt % and 0.002 wt %,
wherein Fe and the at least four elements are uniformly distributed in the alloy structure and the alloy structure is obtained by laminating layer-shaped solidification structures and a growth direction of the column crystal is oriented in a laminating direction of the solidification structures, and
wherein the at least four elements other than Fe are selected from the group consisting of Al, Ti, V, Cr, Co, Ni, Cu, Zn, Ga, Ge, Se, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Te, Ta, W, Re, Os, Ir, Pt, and Au.

2. The alloy structure according to claim 1 , wherein the at least four elements are Al, Co, Cr, and Ni.

3. The alloy structure according to claim 2 , wherein four elements from among Al, Co, Cr, Fe, and Ni are contained in an atomic concentration range of 15 at % or more and 23.75 at % or less, and one element other than the four elements is contained in an atomic concentration range of 5 at % or more and 30 at % or less.

4. The alloy structure according to claim 1 , wherein a difference in an atomic concentration between at least four elements among Fe and the at least four elements is in a range of less than 3 at %.

5. The alloy structure according to claim 1 , wherein the alloy structure has at least one of a diameter and a height that is more than 70 mm.

6. The alloy structure according to claim 1 , wherein a volume of the alloy structure is more than 5495 mm 3 .

Assignees

• Hitachi Ltd
• Hitachi Metals Ltd

Inventors

• Kato Takahiko
• Kuwabara Kousuke
• Fujieda Tadashi
• Aota Kinya
• Takahashi Isamu
• Satake Hiroyuki
• Yamaga Kenji
• Murakami Hajime

Classifications

• C22C30/00 Primary

  Alloys containing less than 50% by weight of each constituent · CPC title

• B22F12/222

  for motion along a direction orthogonal to the plane of a layer · CPC title

• B22F10/32

  of the atmosphere, e.g. composition or pressure in a building chamber · CPC title

• B22F10/38

  to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title