JPS5842260B2 - High strength Fe-Cr amorphous alloy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-strength Fe-Cr amorphous alloy with excellent heat resistance.

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. is called an amorphous alloy (or non-crystalline alloy).

This amorphous alloy has 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 provides an amorphous alloy that is easy to manufacture and has high heat resistance (
The object of the present invention is to provide an amorphous iron-chromium alloy with improved crystallization resistance and further improved mechanical strength.

The present invention contains 1 to 40 atom% of Cr and a total of 2 of C and B.
The present invention relates to a high-strength Fe-Cr-based amorphous alloy with excellent heat resistance, containing C1B and P in a total of 7 to 35 at%, the balance being Fe, with P33 at% or less.

In previous research leading to the present invention, the inventors discovered that Cr 1~
40 atom%, 2 atom% or more of any one of C and B,
It has been found that a complete amorphous alloy can be obtained by rapidly solidifying an alloy consisting of 55 or more atoms of P, one of C and B, and P with a total of 15 to 30 at% balance Fe.

However, in the research of the present invention, a total of 2 C and B
~35 atomic%P is 33 atomic% or less and C, B and P
It has been found that by containing a total of 7 to 35%, it is possible to manufacture a completely amorphous alloy and to further improve the mechanical properties.

Next, a method for manufacturing the amorphous alloy of the present invention will be explained with reference to the drawings.

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 rpm. It is made of a metal with good thermal conductivity, such as an aluminum alloy, and the inner surface is further lined with a metal with good thermal conductivity, such as a copper plate 7.

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 port 1a of the quartz tube 1 by fluid conveyance, heated and melted in the heating furnace 4, and then transferred to the quartz tube 1 by the air piston 8 so that the nozzle 2 faces the inner surface of the rotating drum 5. is lowered to the position shown in the figure, and then, at about the same time as it begins to rise, gas pressure is applied to the molten metal 3, causing the metal to be jetted against 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 three-rotation drum is brought into strong contact with the inner surface of the rotating drum due to the centrifugal force caused by the high-speed rotation, and is cooled at an ultra-high speed, turning into an amorphous alloy.

By such a method, the Fe-Cr-P amorphous alloy of the present invention can be obtained in the form of a long tape-like wire having a thickness of, for example, 0.1 mm and a width of about 10 mm.

In the research of the present invention, an amorphous alloy having the composition shown in Table 1 was prepared using the apparatus shown in the figure and the method described above to a thickness of 0.
It was made into strips of 0.05 mm and width of 0.5 mm.

When converted to weight percent, it is as shown in Table 1, 2.

Table 2 shows the results of tests on mechanical properties of these strips.

For comparison, high Cr stainless steel 405 steel (13%C
r1 Machinery special orders are listed in 415.

As can be seen from Table 2 of /I61-14 samples, A and 14 samples, which contain as much B as 20 at %, have the same yield strength as -Cr content of 10 at %. It has the highest hardness of 400 kg/ma and the highest hardness of 1050 Hv, which is superior to piano wire, which has the highest strength among conventional steels.

Table 3 shows the crystallization temperature (°C) of various alloys of the present invention shown in Table 1 above. The temperature is about 410°C, whereas in the alloy of the present invention, it increases as the Cr content increases, and the temperature reaches Cr40°C.
At atomic %, it reaches 510°C.

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

Cr has the effect of improving the mechanical properties and heat resistance of an amorphous alloy, and if it is less than 2 atomic %, the effect is small, while if it exceeds 40 atomic %, it is difficult to obtain an amorphous alloy even if it is rapidly solidified.

It has been found that by containing P at 33 atomic % or less, the lower limit of the composition range of the total amount of C and B that can form an amorphous structure can be further lowered.

In this case, the reason why the total amount of C and B is limited to 2 to 35 at.% is that an amorphous alloy cannot be obtained when the total amount of C and B is less than 2 at.%, and the total amount of both elements is 35 at.%. If the value exceeds 100%, an amorphous alloy cannot be obtained.

If P exceeds 33 atomic %, an amorphous alloy cannot be obtained.

The total amount of C, B and P is limited to 7 to 35 at%,
If the total amount is less than 7 at %, an amorphous alloy cannot be obtained, and if the total amount exceeds 35 at %, an amorphous alloy cannot be obtained.

Next, embodiments of the present invention will be described.

Example I Using a blended material consisting of 5 atomic % C, 55 atomic % B, 20 atomic % P, 10 atomic % Cr, and the balance Fe as raw materials, an alloy having a completely amorphous structure could be obtained by the above manufacturing method.

Among the mechanical properties of this alloy, the yield strength is 350 kg/mi
, fracture strength 400 kg/mA, elongation 0.01%, hardness Hv) 950, and has extremely superior mechanical properties compared to high Cr stainless steel, and crystallization temperature is 480 ° C.
It had excellent heat resistance.

As described above, the Fe-Cr based amorphous alloy of the present invention has the advantage that the addition of chromium not only increases the strength but also increases the heat resistance.

On the other hand, the addition of C and B is necessary to make an amorphous alloy, and by further adding P to these,
The lower limit of the content range of the total amount of C and B can be expanded.

On the other hand, compared to the case where C and P or B and P are added, it is particularly advantageous in industrial production that the rapid solidification conditions can be relaxed to some extent.

That is, an amorphous alloy with excellent mechanical strength can be obtained within the composition range of the present invention.

The amorphous alloy of the present invention can be manufactured as thin strips and has high strength that cannot be obtained with conventional practical metal materials.

Therefore, the amorphous alloy of the present invention is suitable for products that require high strength and heat resistance, such as rubber for wheels, belts, reinforcing cords embedded in plastic products, cords embedded in concrete, etc. It is also suitable for uses such as filters, screens, and filaments for blending with fibers.

[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.

Claims (1)

[Claims] 1 In terms of atomic %, contains 1 to 40% of Cr, 0.01% or more of each of C and B and 2 to 35% in total, and 33% or less of P, and contains 7 to 35% of C, B, and P in total. A high-strength Fe-Cr-based amorphous alloy with excellent heat resistance, the balance being Fe.