JPS5842261B2 - High strength amorphous iron alloy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to mechanical strength amorphous iron alloys.

Normally, metals are in a crystalline state in the solid state, but under certain special conditions (alloy composition, rapid solidification), even in the solid state, an atomic structure that does not have a crystalline structure similar to that of a liquid can be obtained. Or the alloy is called an amorphous alloy (or non-crystalline alloy).

This amorphous alloy has the potential to possess significantly higher strength than conventional practical metal materials.

On the other hand, when used as a practical metal, it may be used not only at room temperature but also at elevated temperatures, and amorphous alloys have a crystallization temperature at which they change to crystalline metals or alloys at a certain temperature depending on their composition. There is.

When an amorphous alloy crystallizes, it loses its properties as an amorphous alloy.

Therefore, when used under such elevated temperature conditions, it is necessary that the crystallization temperature is as high as possible.

The present invention aims to provide an amorphous alloy with improved heat resistance (crystallization resistance) and further improved mechanical strength.

The present invention consists of 1 to 40% of Cr, 2% or more of any one of C and B, 25% or more of any one of C and B, 30 to 35% of the total of any one of C and B and P, and the balance Fe. In the present invention, Cr is Fe-C-P system and Fe-
C or B has the effect of improving the mechanical properties of the B--P based amorphous alloy, and C or B facilitates amorphization by coexisting with P.

Since the amorphous iron alloy of the present invention does not have a crystalline structure, it is excellent in mechanical strength such as yield strength, fracture strength, and hardness.

Next, a method for manufacturing the amorphous alloy of the present invention will be explained using figures.

The figure is a schematic diagram showing an example of an apparatus for producing the amorphous alloy of the present invention.

In the figure, 1 is a quartz tube having a nozzle 2 at its lower end that ejects water in a horizontal direction, into which raw metal 3 is charged and melted.

4 is a heating furnace for heating the raw metal 3, and 5 is a rotating drum rotated by a motor 6 at a high speed, for example, 5000 r, p, m, to minimize the centrifugal force load due to the rotation of the drum. Therefore, it is made of a lightweight metal with good heat conductivity, such as an aluminum alloy, and the inner surface is lined with a metal with good heat conductivity, such as copper plate 1.

8 is an air piston for supporting the quartz tube 1 and moving it up and down.

The raw metal is first charged through the inlet 1a of the quartz tube 1 by fluid conveyance, heated and melted in the heating furnace 4, and then heated and melted by the air piston 8 so that the nozzle 2 faces the inner surface of the rotating drum 5. Tube 1 is lowered to the position shown in the figure,
Gas pressure is then applied to the molten metal 3 almost as soon as it begins to rise, causing the metal to be jetted toward the inner surface of the rotating drum.

In order to prevent oxidation of the metal 3, an inert gas such as argon gas 9 is constantly fed into the quartz tube to create an inert atmosphere.

The metal jetted onto the inner surface of the rotating drum is brought into strong contact with the inner surface of the rotating drum due to the centrifugal force caused by high-speed rotation, and the molten jet metal is sprayed onto the inner surface of the rotating drum. An amorphous alloy can be obtained by cooling the alloy at a cooling rate of at least 107° C./sec by jetting from a 10°C.

Liquid air or liquid nitrogen can be suitably used as the deep-chilled gas.

In the research of the present invention, an amorphous iron alloy having the composition shown in Table 1 was made into strips with a thickness of 0.051 m and a width of 0.5 m using the apparatus shown in the figure.

Converting the composition in atomic % in Table 1 to weight % shows 1 in Table 1.
It will be as follows.

Samples were taken from each of these strips and tested for mechanical properties, and the results are shown in Table 2.

For comparison, high Cr stainless steel 405 steel (13%
The mechanical properties of Cr, 0.2% AI> are listed in A9.

As can be seen from Table 2, there is a significant increase in strength and hardness compared to 405 steel, and there is little elongation.

The A6.2 alloy of the present invention has a breaking strength of 390 kg/ma, which is superior to piano wire, which has the highest strength in conventional steels.

Table 3 shows the crystallization temperatures (°C) of various alloys of the present invention shown in Table 1 above, and shows the crystallization temperatures (°C) of the various alloys of the present invention shown in Table 1. In alloys, the crystallization temperature is around 410°C, but when Cr is added, the crystallization temperature tends to gradually rise, and the crystallization temperature is around 40 at%.
It is possible to raise the temperature to 510'C.

The reasons for limiting the components in the alloy of the present invention will be described below.

Regarding Cr, Fe -C-P system and Fe -B-
It has the effect of improving the mechanical properties and heat resistance of P-based amorphous alloys, and if it is less than 2 atomic %, the effect is small, while if it exceeds 40 atomic %, an amorphous structure cannot be obtained.

Therefore, 1 to 40 atom % of Cr is required, and a preferable range is 5 to 30 atom %.

C and B have the property of making the alloy amorphous, and their effects are the same.

The reason why the minimum amount of C or B is 2 atomic % is because an amorphous structure cannot be obtained with less than 2 atomic %.

P has the property of making the alloy amorphous, and the reason why the minimum amount of P is set at 5 atomic % is because it is difficult to obtain an amorphous structure with less than 5 atomic %.

The reason why the total amount of any one of C and B and P is set to be 35 atomic % or less is because if it exceeds 35 atomic %, it is difficult to obtain an amorphous structure.

However, the reason why the total content of any one of C and B and P is set at 30 atomic % or more is that an alloy having this structure range has been previously filed as an invention by the present inventors.

As described above, the alloy of the present invention has excellent mechanical properties and heat resistance, and is suitable for reinforcing cords embedded in rubber such as vehicle tires and belts, reinforcing cords embedded in plastic products, and cords embedded in concrete. Suitable for use as composite materials such as filaments for blended spinning.

[Brief explanation of drawings]

The figure is a schematic diagram showing an example of an apparatus for producing the amorphous alloy of the present invention. 1...Quartz tube, 2...Nozzle, 3...
... Raw metal, 4 ... Heating furnace, 5 ...
...Rotating drum, 6...Motor, 7...
...Copper plate, 8...Air piston, 9...
・Argon gas, 10... Deep cold gas injection pipe.

Claims (1)

[Claims] 1 atomic%: 1 to 40% Cr, 2% or more of any one of C and B, 25% or more, 30 to 35% alloy of one of C and B and P, and the remainder Fe A strong amorphous iron alloy.