RU97100791A

RU97100791A - HIGH-STRENGTH, HIGH-PLASTIC TITANIUM ALLOY AND METHOD OF ITS MANUFACTURE

Info

Publication number: RU97100791A
Application number: RU97100791/02A
Authority: RU
Inventors: Соеда Сейити; Фудзии Хидеки; Окано Хироюки; Ханаки Митио
Original assignee: Ниппон Стил Корпорейшн
Priority date: 1995-04-21
Filing date: 1996-04-19
Publication date: 1999-02-10

Claims

1. High-strength, high-ductile titanium alloy containing O, N and Fe as reinforcing elements and Ti the rest, while the content of reinforcing elements is as follows: 0.9 - 2.3 wt.% Fe, up to 0.05 wt.% N , the value of oxygen equivalent Q, which is determined by the formula below, 0.34 - 1.00
Q = [O] + 2.77 [N] + 0.1 [Fe],
where [O] is the oxygen content, wt.%;
[N] - nitrogen content, wt.%;
[Fe] - iron content, wt.%,
moreover, the titanium alloy has a tensile strength of at least 700 MPa and an elongation ratio of at least 15%.

2. High-strength, high-ductile titanium alloy containing O, N, Fe and at least one element selected from the group including Cr and Ni as reinforcing elements and the rest Ti, the content of reinforcing elements being the following: 0.9 - 2, 3 wt.% - the total amount of Fe, Cr and Ni, at least 0.4 wt.% Fe, up to 0.25 wt.% Cr, up to 0.25 wt. % Ni, up to 0.05 wt.% N, the value of oxygen equivalent Q, which is determined by the formula below, 0.34 - 1.00
Q = [O] + 2.77 [N] + 0.1 {[Fe] + [Cr] + [Ni]},
where [O] is the oxygen content, wt.%;
[N] - nitrogen content, wt.%;
[Fe] - iron content, wt.%,
[Cr] - chromium content, wt.%;
[Ni] - Nickel content, wt.%,
moreover, the titanium alloy has a tensile strength of at least 700 MPa and an elongation ratio of at least 15%.

3. The high-strength, high-ductile titanium alloy according to claim 1, wherein the value of the oxygen equivalent Q is 0.34 - 0.68, the titanium alloy has a tensile strength of 700 - 900 MPa and an elongation factor of at least 20%.

4. The high strength, high ductile titanium alloy of claim 1, wherein the oxygen equivalent Q value is 0.50-1.0, and the titanium alloy has a tensile strength of at least 850 MPa and an elongation factor of at least 15%.

5. The high strength, high ductile titanium alloy of claim 4, wherein the value of the oxygen equivalent Q is more than 0.68 - 1.00, the titanium alloy has a tensile strength exceeding 900 MPa.

6. The high strength, high ductile titanium alloy of claim 2, wherein the oxygen equivalent Q value is 0.34-0.68, the titanium alloy has a tensile strength of 700-900 MPa and an elongation ratio of at least 20%.

7. The high strength, high ductile titanium alloy of claim 2, wherein the oxygen equivalent Q value is 0.50-1.00, the titanium alloy has a tensile strength of at least 850 MPa and an elongation factor of at least 15%.

8. The high strength, high ductile titanium alloy according to claim 7, in which the value of the oxygen equivalent Q is greater than 0.68 - 1.00, the titanium alloy has a tensile strength exceeding 900 MPa.

9. Method for the production of high-strength, highly ductile titanium alloy containing O, N and Fe as reinforcing elements and Ti else, the content of reinforcing elements is as follows: 0.9 - 2.3 wt.% Fe, up to 0.05 wt. % N, the value of oxygen equivalent Q, which is determined by the formula below, 0.34 - 1.00
Q = [O] + 2.77 [N] + 0.1 [Fe],
where [O] is the oxygen content, wt.%;
[N] - nitrogen content, wt.%;
[Fe] - iron content, wt.%,
moreover, the titanium alloy has a tensile strength of at least 700 MPa and an elongation ratio of at least 15%, including loading and melting at least one steel selected from the group including stainless steel and carbon steel, in the process of making a titanium alloy by fusing such This means that at least part of Fe is added from steel as a reinforcing element.

10. Method for the production of high-strength, highly ductile titanium alloy containing O, N, Fe and at least one element selected from the group including Cr and Ni as reinforcing elements, Ti the rest, while the content of reinforcing elements is as follows: 0.9 - 2.3 wt.% - the total content of Fe, Cr and Ni, at least 0.4 wt.% Fe, up to 0.25 weight. % Cr, up to 0.25 wt.% Ni, up to 0.05 wt.% N, the value of oxygen equivalent Q, which is defined by the formula below, 0.34 - 1.00
Q = [O] + 2.77 [N] + 0.1 {[Fe] + [Cr] + [Ni]},
where [O] is the oxygen content, wt.%;
[N] - nitrogen content, wt.%;
[Fe] - iron content, wt.%,
moreover, the titanium alloy has a tensile strength of at least 700 MPa and a coefficient of at least 15%, including loading and melting at least one steel selected from the group including carbon steel and stainless steel, in the process of manufacturing a titanium alloy by alloying, This means that at least part of Fe, Cr and Ni as reinforcing elements are made from steel.

11. Method for the production of high-strength, highly ductile titanium alloy containing O, N, Fe as reinforcing elements and Ti else, the content of reinforcing elements is as follows: 0.9 - 2.3 wt.% Fe, up to 0.05 weight. % N, the value of oxygen equivalent Q, which is determined by the formula below, 0.34 - 1.00
Q = [O] + 2.77 [N] + 0.1 [Fe],
where [O] is the oxygen content, wt.%;
[N] - nitrogen content, wt.%;
[Fe] - iron content, wt.%,
moreover, the titanium alloy has a tensile strength of at least 700 MPa and an elongation ratio of at least 15%, including the manufacture of titanium spongy by using a reactor containing Fe in the manufacture of sponge titanium, so that the titanium sponge contains Fe, which is transferred from the reactor and captured, and the supply of titanium sponge at least as part of the loading of the raw material containing Fe as a reinforcing element, in the process of manufacturing a titanium alloy by fusion.

12. Method for the production of high-strength, highly ductile titanium alloy containing O, N, Fe and at least one element selected from the group comprising Cr and Ni as reinforcing elements, and Ti else, the content of reinforcing elements as follows: 0.9 - 2.3 wt.% - the total amount of Fe, Cr and Ni, at least 0.4 wt.% Fe, up to 0.25 weight. % Cr, up to 0.25 wt.% Ni, up to 0.05 wt.% N, the value of oxygen equivalent Q, which is defined by the formula below, 0.34 - 1.00
Q = [O] + 2.77 [N] + 0.1 {[Fe] + [Cr] + [Ni]},
where [O] is the oxygen content, wt.%;
[N] - nitrogen content, wt.%;
[Fe] - iron content, wt.%,
while the titanium alloy has a tensile strength of at least 700 MPa and an elongation ratio of at least 15%, including the manufacture of titanium sponge by using a reactor containing at least one element selected from the group including Fe, Cr and Ni, in step fabricating titanium sponge in such a way that titanium sponge contains at least one element that has been transferred and captured, and the supply of titanium sponge as at least part of the raw material load containing at least one element, The selected from the group consisting of Fe, Cr and Ni, as the reinforcing member during manufacture of the titanium alloy by melting.