US2024376574A1PendingUtilityA1
Cobalt-chromium alloy member, method of producing the same, and device using the same
Assignee: NAT INST MATERIALS SCIENCEPriority: Aug 26, 2021Filed: Aug 22, 2022Published: Nov 14, 2024
Est. expiryAug 26, 2041(~15.1 yrs left)· nominal 20-yr term from priority
C22C 19/05C22C 19/07C22F 1/16C22F 1/10C22F 1/00C22C 30/00
62
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
[Object] To provide a cobalt-chromium alloy member suitable for use in medical devices, devices for gas turbines, or devices for other industrial equipment.[Solving Means] There is provided a cobalt-chromium alloy member, which has a composition of, in terms of mass %, 23 to 32% of Ni, 37 to 48% of Co, and 8 to 12% of Mo, a remainder thereof containing Cr and an unavoidable impurity, the composition satisfying a relationship of 20≤[Cr %]+[Mo %]+[unavoidable impurity %]≤40, a crystal structure including a face-centered cubic lattice (fcc) or a crystal structure including a face-centered cubic lattice (fcc) and a hexagonal lattice (hcp), and an average value of a crystal grain size of 2 to 15 μm and a change amount in local crystal orientation (KAM value) of 0.0 or more and 1.0 or less, the cobalt-chromium alloy member exhibiting a tensile strength of 800 to 1200 MPa and a breaking elongation of 30 to 80%.
Claims
exact text as granted — not AI-modified1 . A cobalt-chromium alloy member, which has
a composition of, in terms of mass %, 23 to 32% of Ni, 37 to 48% of Co, and 8 to 12% of Mo, a remainder thereof containing Cr and an unavoidable impurity, the composition satisfying a relationship of
20
≤
[
Cr
%
]
+
[
Mo
%
]
+
[
unavoidable
impurity
%
]
≤
40
,
a crystal structure including a face-centered cubic lattice (fcc) or a crystal structure including a face-centered cubic lattice (fcc) and a hexagonal lattice (hcp), and
an average value of a crystal grain size of 2 to 15 μm and a change amount in local crystal orientation (KAM value) of 0.0 or more and 1.0 or less, the cobalt-chromium alloy member exhibiting
a tensile strength of 800 to 1200 MPa and a breaking elongation of 30 to 80%.
2 . The cobalt-chromium alloy member according to claim 1 , which is obtained by performing heat treatment at a heat treatment temperature exceeding a recrystallization temperature of a cobalt-chromium alloy material having the composition on a cobalt-chromium alloy as-processed material obtained by causing the cobalt-chromium alloy material to be subjected to cold plastic working into a predetermined shape.
3 . The cobalt-chromium alloy member according to claim 1 , which has
a composition of, in terms of mass %, 25 to 29% of Ni, 37 to 48% of Co, and 9 to 11% of Mo, a remainder thereof containing Cr and an unavoidable impurity, the composition satisfying a relationship of
23
≤
[
Cr
%
]
+
[
Mo
%
]
+
[
unavoidable
impurity
%
]
≤
38.
4 . The cobalt-chromium alloy member according to claim 3 , which is obtained by performing heat treatment for 1 minute or more and 60 minutes or less at 800° C. or more and 1100° C. or less as heat treatment performed at a heat treatment temperature exceeding a recrystallization temperature of a cobalt-chromium alloy material having the composition on a cobalt-chromium alloy as-processed material obtained by causing the cobalt-chromium alloy material to be subjected to cold plastic working into a predetermined shape.
5 . The cobalt-chromium alloy member according to claim 1 , wherein
the unavoidable impurity contains, in terms of mass %, 1.0% or less of Ti, 1.0% or less of Mn, 1.0% or less of Fe, 1.0% or less of Nb, 1.0% or less of W, 0.5% or less of Al, 0.1% or less of Zr, 0.01% or less of B, and 0.1% or less of C as contents of Ti, Mn, Fe, Nb, W, Al, Zr, B, and C.
6 . The cobalt-chromium alloy member according to claim 1 , wherein
the predetermined shape obtained by the cold plastic working is a tubular shape, the cobalt-chromium alloy member having an average value of a crystal grain size of 2 to 15 μm and a change amount in local crystal orientation (KAM value) of 0.1 or more and 0.8 or less and exhibiting a tensile strength of 1000 to 1200 MPa and a breaking elongation of 30 to 80%.
7 . The cobalt-chromium alloy member according to claim 1 , wherein
the predetermined shape obtained by the cold plastic working is a wire shape, the cobalt-chromium alloy member having an average value of a crystal grain size of 4 to 15 μm and a change amount in local crystal orientation (KAM value) of 0.0 or more and 1.0 or less and exhibiting a tensile strength of 1000 to 1200 MPa and a breaking elongation of 30 to 60%.
8 . A device comprising the cobalt-chromium alloy member according to claim 1 .
9 . The device according to claim 8 , which is
a medical device selected from a stent, a tube, a wire, and an implant.
10 . The device according to claim 8 , which is
a device for gas turbines selected from a combustor and an exhaust component for aviation and industrial gas turbine engines, that is a tail tube, a combustion tube, a spray bar, a frame holder, an afterburner, or a tail pipe.
11 . The device according to claim 8 , which is
a device for industrial equipment used in waste incinerators, boilers, high-temperature reaction vessels, rotary calciners, or a production plant or synthesis gas plant of petrochemical products.
12 . A method of producing a cobalt-chromium alloy member, comprising:
preparing a cobalt-chromium alloy material having a composition of, in terms of mass %, 23 to 32% of Ni, 37 to 48% of Co, and 8 to 12% of Mo, a remainder thereof containing Cr and an unavoidable impurity, the composition satisfying a relationship of
20
≤
[
Cr
%
]
+
[
Mo
%
]
+
[
unavoidable
impurity
%
]
≤
40
;
homogenizing the prepared cobalt-chromium alloy material at 1100° C. to 1300° C.;
causing the homogenized cobalt-chromium alloy material to be subjected to cold plastic working into a tubular shape or a wire shape to obtain a cobalt-chromium alloy as-processed material; and
performing heat treatment for 1 minute or more and 60 minutes or less at a temperature exceeding a recrystallization temperature of the cobalt-chromium alloy material and 1100° C. or less on the cobalt-chromium alloy as-processed material obtained by the cold plastic working to obtain a cobalt-chromium alloy member characterized by having a crystal structure including a face-centered cubic lattice (fcc) or a crystal structure including a face-centered cubic lattice (fcc) and a hexagonal lattice (hcp), an average value of a crystal grain size of 2 to 15 μm, and a change amount in local crystal orientation (KAM value) of 0.0 or more and 1.0 or less.
13 . The cobalt-chromium alloy member according to claim 2 , which has
a composition of, in terms of mass %, 25 to 29% of Ni, 37 to 48% of Co, and 9 to 11% of Mo, a remainder thereof containing Cr and an unavoidable impurity, the composition satisfying a relationship of
23
≤
[
Cr
%
]
+
[
Mo
%
]
+
[
unavoidable
impurity
%
]
≤
38.
14 . The cobalt-chromium alloy member according to claim 13 , which is obtained by performing heat treatment for 1 minute or more and 60 minutes or less at 800° C. or more and 1100° C. or less as heat treatment performed at a heat treatment temperature exceeding a recrystallization temperature of a cobalt-chromium alloy material having the composition on a cobalt-chromium alloy as-processed material obtained by causing the cobalt-chromium alloy material to be subjected to cold plastic working into a predetermined shape.Join the waitlist — get patent alerts
Track US2024376574A1 — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.