JPS6039147B2 - Soft magnetic material with high electrical resistance and high strength - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has high strength, excellent ductility and toughness,
Furthermore, the present invention relates to a European magnetic material with high electrical resistance.

Normally, it is difficult to make soft magnetic materials have high strength and excellent ductility and toughness due to the characteristics of the material, so in the past, high strength was rarely required of soft magnetic materials. It is no exaggeration to say that.

However, very recently, there has been a demand for soft magnetic materials that have high strength, excellent ductility and toughness, and high air resistance in fields such as aerospace and industrial equipment. However, in response to these demands,
None of the conventional soft magnetic materials can be used in terms of strength and electrical properties, and strong steel, special alloys, or slightly improved materials have been unavoidably used; Since it is originally a structural material or a mechanical component material, it has not always been possible to satisfy these requirements in terms of magnetic properties and electrical properties. In other words, to explain the current situation by listing a few materials, we would like to explain the current situation by citing a few materials: MS1434 female steel, which is a typical strong steel, and AI
Examples include SI-11 steel, 1-shu i and 1-funi marage steel, and the strength at room temperature is 130 to 24 at 0.2% proof stress.
~k9/m2 can be obtained, but the coercive force is about 20 to 30 degrees, so the magnetic properties are not difficult enough to meet the requirements, and the electrical resistance is 10 μm to 40 degrees Fahrenheit. That's about it. However, the characteristics of the material required for these uses include strength, ductility, and toughness that are at least approximately equivalent to those of a strong key, and a coercive force of about 10 ratio or less. In addition, when using these as high-speed rotating body members, in order to maintain rotational stability, it is necessary to minimize the internal damping that occurs in the rotating body, and it is also necessary to minimize the occurrence of eddy currents, that is, to reduce electrical resistance. The highest quality materials are required. Therefore, the present invention was first developed by Samurai Isoaki 54-196684.
"High-strength Tsuruga magnetic material" which has high strength and outstanding ductility and toughness without impairing the European magnetic properties of Fe-Ni martensite, which was proposed as the No.
The objective is to obtain a soft magnetic material with high strength and high electrical resistance with high electrical resistance.

In the present invention, in order to achieve this objective, first,
In order to combine strength, ductility and toughness, ALCo, Mo, W, etc. are added and age hardened, and Cr is added with the intention of increasing electrical resistance. In addition to improving strength, Ni, AI,
It is characterized in that it is added with the intention of compensating for the decrease in saturation magnetic flux density and residual magnetic flux density caused by the addition of Mo, W, etc., and improving the magnetic properties.

That is, the soft magnetic material having high electrical resistance and high strength according to the present invention contains 5 to 24 M% of Ni and 2 to 2% of Co.
, Cro. 5 to 5 wt%, NO. 2 to 2.5 M%, the balance being Fe, and if necessary, Moo. 2
~1.6M% and WO. Any one from 2 to 1.6 wt%
One or more of Nb, Ti, Zr, V, and B may be added in a total of 0.5 wt% or less in place of or in addition to these, and solution treatment is performed. After the treatment, it is characterized by being subjected to an aging treatment.

Hereinafter, the present invention will be explained in detail based on examples thereof.

The soft magnetic material having high electrical resistance and breakdown strength according to the present invention has the chemical components described above. First, the reason for limiting the range of chemical components will be explained in detail.

M: In order to heat the Fe-Ni alloy until it becomes a single y-phase, and then cool it to form a single phase martensitic structure at room temperature, the content must be about 24 wt% or less.

In the normal heat treatment process, the t-equilibrium state cannot be easily obtained, and N
When the j content exceeds 24 wt%, the y phase remains, increasing the coercive force and decreasing the strength. In Fe-Ni martensite, when the Ni content is increased, the saturation magnetic density slightly decreases and the coercive force slightly increases, so in order to reduce the coercive force, it is better to reduce the Ni content. is desirable. However, in order to make the strength level comparable to that of strong steel and not to impair ductility and toughness, the lower limit of the Ni content is 5M%. Co: Addition of Co is effective not only for improving magnetic properties but also for improving strength, and increases the ductility and toughness seen when AI is added alone to Fe-Ni alloy and age hardened. It is also effective in suppressing the decline in

The Co content is effective from 2.5 wt%, and as the amount added increases, the strength increases, but if it exceeds 1 t%, the ductility and toughness decrease, and from the viewpoint of magnetic properties. ,
Since it increases the coercive force, it is desirable that the magnetic flux is 2% or less. Cr:
In general, when gold elements are added to increase electrical resistance, the magnetic properties deteriorate, especially the coercive force increases, and the material is not sufficiently soft. However, the addition of Cr increases electrical resistance without impairing the magnetic properties. We believe that it is effective for
It started.

However, if the Cr content is less than 0.5 wt%, there is almost no effect of increasing the electrical resistance circle, and if it is more than 5 wt%, the ductility and toughness decrease, so 0.5 to 5 wt%
is desirable. N:AI content is 0. If it is less than t%, the aging treatment time becomes longer due to the slow precipitation rate, which is not practical.

Moreover, the amount of precipitation effect is also small. However, the AI content is 2.
If it exceeds 2%, it will lead to a decrease in ductility and toughness.
The N content is preferably 0.2 to 2.5 wt%. Mo,W
:0.2 to 1.6M% of Mo or 0.2 to 1.6M% of W.
When 6 wt% is added alone or in combination, a decrease in ductility and toughness due to an increase in strength can be prevented, and good ductility and toughness can be obtained.

C, Si, Mn, P, S: Since C impairs the good ductility and toughness of the low carbon martensitic structure and increases the coercive force, the content is preferably 0.02 Wt% or less.

Even when Si is used as a deoxidizing agent, its deoxidizing effect is 0.
．． 5 wt% or less is sufficient.

Addition of 0.5 wt% or more significantly reduces ductility and toughness.

Even when Mn is used as a deoxidizing agent and to improve hot workability, from the viewpoint of deoxidizing effect and improving workability,
It is sufficient to add 0.6 wt% or less, and adding more than that increases the coercive force. Since P and S reduce the ductility and toughness of high-strength materials, it is desirable that they be as small as possible.

However, if it is 0.01 wt% or less, even if the strength level becomes high, the decrease in ductility and toughness is slight. Next, the present invention will be explained with reference to its embodiments.

An alloy having the composition (wt%) shown in Table 1 was melted to 10k9 in a vacuum induction melting furnace, homogenized, hot forged, and then hot rolled. Test pieces were made from hot rolled material. In the table, symbols 1 to 7 are based on the present invention, and symbols 8 to 10 are based on the aforementioned prior invention.
The test piece was subjected to a melting treatment to form a single martensitic phase, and was further subjected to an aging treatment.

Note that when the solution treatment temperature is 80,000 or less, uniform y
A single phase cannot be obtained, and if it exceeds 90,000, the crystal grains will become coarse and the ductility and toughness will decrease.
00 is desirable. Therefore, in this embodiment, port processing was performed at 820oo. In addition, the aging process is 55,000
In this case, a y-phase is generated and the coercive force increases, and the material does not have the required strength. On the other hand, if it is less than 45,000, the aging treatment time becomes longer due to the slow precipitation rate, which is not practical. Therefore, in this example, the test was carried out for 50,000 times for 5 hours. Tensile tests, magnetic measurements, and electrical resistance measurements were performed on the test pieces prepared as described above.

The results are shown in Table 2. As can be seen from the table, the tensile strength (〇o) is equal to or higher than that of strong steel, the elongation (EI) and the area of area (R, A,) are 12% or more and 40% or more, respectively, and the ductility and High toughness. Regarding magnetic properties,
The coercive force (Hc) is 1 pio or less. Electrical resistance (p)
is more than 10 degrees higher than the previous invention material, and more than 40 degrees higher than the previous invention material. As described above, the magnetic material according to the present invention has high electrical resistance, high strength, high ductility and toughness by solution treatment and aging treatment, and has magnetic properties of soft magnetic properties. Since it fully satisfies the characteristics as a material, it provides the optimal soft magnetic material with high electrical resistance and high strength, which is currently in demand in fields such as aerospace. .

Table I Table 2

Claims (1)

[Claims] 1 Ni5-24wt%, Co2-20wt%, Cr0
．． A soft magnetic material having high electrical resistance and high strength, characterized in that it contains 5 to 5 wt% of Al, 0.2 to 2.5 wt% of Al, and the remainder is Fe except for impurities that are unavoidable in manufacturing. 2 Ni5-24wt%, Co2-20wt%, Cr0
．． 5 to 5 wt%, Al 0.2 to 2.5 wt%, further Mo 0.2 to 1.6 wt%, W 0.2 to 1.6 wt%.
A soft magnetic material having high electrical resistance and high strength, characterized in that it contains at least one type of Fe.