JPS5844144B2 - Ni-Fe based high permeability alloy with good hot workability and machinability - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a Ni-Fe alloy that improves hot workability and machinability without impairing the inherent magnetism of the alloy by incorporating trace amounts of magnesium and sulfur into the Ni-Fe alloy.
The present invention relates to high permeability magnetic alloys.

Ni-Fe alloys are collectively known as permalloys and exhibit the highest relative magnetic permeability among high magnetic permeability materials.
There are many types that are currently commercially available.

However, all of these types of alloys have the disadvantage of poor hot workability and extremely poor machinability because they are flexible and tough.

Therefore, lead, bismuth, selenium,
Various alloys have been proposed and implemented in which machinability has been improved by adding small amounts of tellurium, calsholum, etc., and some have achieved some success.

However, in general, addition of these machinability-improving elements tends to further reduce hot workability, which has the disadvantage of worsening manufacturability.

The inventors of the present invention investigated various types to overcome the above-mentioned drawbacks, and as a result, succeeded in obtaining a Ni-Fe based high magnetic permeability alloy with good hot workability and rigidity without impairing the inherent magnetism of the alloy. .

That is, the present invention relates to a Ni-Fe alloy consisting of 35 to 90% by weight of Ni, the balance being iron and impurities, or an alloy containing generally known elements for improving magnetic properties and mechanical properties (Mo, Cu, Cr). 1 or more types (total of 10% by weight or less)
Or Ni-
0.004-0.25% by weight of M based on Fe-based alloy
This is a Ni--Fe based high magnetic permeability alloy characterized by containing g and 0.005 to 0.15% by weight of S.

Next, the reasons for limiting the number of added elements will be described.

Mo: <6% by weight, Cu: <6% by weight, Cr: <
12% by weight (total amount: 2% by weight or more, but not more than 10% by weight) It works to improve maximum magnetic permeability and mechanical properties, and adding a large amount deteriorates hot workability, so it was set within the above range.

Se: <0.25% by weight, Cu: <0.065
wt%, Te: 0.20 wt% (total amount 0.01 wt%
(Hereinafter, 3.0% by weight or less) is effective in improving machinability, but since adding a large amount impairs hot workability, it is set within the above range.

Note that the present invention uses Si as an element for improving magnetic properties and mechanical properties.
, AI, V, Nb, , Ta, Ti, Mn, W, etc. and/or machinability improving elements such as Sn, Pb, Bi, etc. can be added within the range normally added to this type of alloy. We have also confirmed that there will be no damage.

The feature of the present invention is that hot workability is significantly improved by adding a small amount of magnesium, and machinability is significantly improved by adding sulfur due to the combined effect of magnesium and sulfur. , conventional Ni
-This is a new alloy that eliminates the manufacturing defects of Fe-based high magnetic permeability alloys.

Conventionally used Ni-Fe alloys have poor hot workability, so strong deoxidation and desulfurization treatments are performed during molten steel refining.
Oxygen and sulfur content must be kept as low as possible.
Therefore, it was necessary to use an expensive low-sulfur raw material, but this is not necessary at all in the production of the alloy of the present invention, and the alloy can be produced at low cost.

The effective amount of Mg added, which is a feature of the alloy of the present invention, is 0.004
~0.25% by weight.

This is because if it is less than 0.004% by weight, the effect of improving hot workability is small.

However, adding more than 0.25% by weight not only does not significantly contribute to improving hot workability but also reduces magnetic properties, especially maximum permeability, so the above range is effective.

On the other hand, for S, the effect of combining with M2 and improving machinability is observed at 0.005% by weight or more.

However, if added in a large amount, the hot workability will be seriously deteriorated and at the same time it will also have an adverse effect on the magnetism, so the appropriate amount is 0.15% by weight or less.

Next, the characteristics of the alloy of the present invention will be explained in detail using examples.

Example 1 A Ni--Fe based high magnetic permeability alloy having the alloy composition shown in Table 1 was melted and various properties were investigated.

Test materials A1 to 7 and As2 are 45N containing Mg and S.
i-Fe-based high magnetic permeability alloy, test material layers 8 to 11 and A
7' is a 78Ni-Fe based high magnetic permeability alloy containing Mg and S.

The test material layers 12 and 13 are a 45Ni alloy and a 78Ni alloy having conventional alloy compositions, which were produced for comparison.

In order to investigate the hot workability of the test materials in Table 1, hot torsion test pieces (diameter 81n7r) were prepared from the surface layer of each ingot.
t×length 30 mm) was collected.

The conditions for the hot torsion test were a strain rate of 5 See -1, and the number of twisting rotations until breakage was measured.

Figure 1 shows the tensile strength to fracture at each test temperature, and the alloys of the present invention all have higher tensile strength to fracture than the comparative steels, indicating that they have better hot workability. There is.

Next, in order to examine the machinability of the sample material, a round bar test piece with a diameter of 30 mm was taken and a cutting test was conducted.

FIG. 2 is a diagram showing the cutting time and the flank wear amount of the tool, and shows that the alloy of the present invention has a smaller tool flank wear amount and better machinability than the comparative steel.

As described above, it is clearly shown that the hot workability and machinability of Ni-Fe based high magnetic permeability alloys can be improved by adding appropriate amounts of magnesium and sulfur.

Next, in order to investigate the magnetic properties of the alloy of the present invention, an annular test piece with an outer diameter of 45 mm, an inner diameter of 33 mm, and a thickness of 10 mm was cut from the test material shown in Table 1, annealed at 1100°C for 2 hours, and then subjected to direct current. The magnetic properties were measured.

The results are shown in Table 2.

Looking at the 45%Ni-Fe system components, as the Mg and S content increases, the magnetic properties of the comparison material layer 12
Although it tends to deteriorate more, it exhibits high magnetism that is sufficient for practical use.

In addition, 5.5' and 6.7, in which magnetic and mechanical property improving elements and machinability improving elements were added, both exhibited large maximum permeability values of 28,000 or more.

On the other hand, looking at the composition of the 80% Ni-Fe alloy, the maximum magnetic permeability of the present invention materials A7' and 8.9.10.11 is 1.
ooooo or more, satisfying the JIS standard.

As mentioned above, M
By adding g and S, hot workability and machinability can be improved without impairing magnetic properties, and this can greatly contribute to improving the manufacturability of the alloy system.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the equivalent hot rupture properties of the alloy of the present invention and the conventional alloy, and FIG. 2 is a diagram showing the machinability of the alloy of the present invention and the conventional alloy.

Claims (1)

[Claims] 1 0.004 to 0.2 for a Ni-Fe alloy consisting of 35 to 90% by weight of nickel, the balance being iron and impurities.
5% by weight of magnesium and 0.005 to 0.15% by weight of sulfur.
E-based high permeability magnetic alloy. 2 0.004 to 0.2% for a Ni-Fe alloy consisting of 35 to 90% by weight of nickel, the balance being iron and impurities.
25% by weight of magnesium, O,OO5~0.15
One or two of the following: sulfur at % by weight, molyfdenum at most 6% by weight, copper at most 6% by weight, and chromium at most 12% by weight.
1. A NiFe-based high magnetic permeability alloy containing at least one species (2 to 10% by weight in total). 3 0.004 to 0.2 for a Ni-Fe alloy consisting of 35 to 90% by weight of nickel, the balance being iron and impurities.
5% by weight of magnesium, 0.005-0.15% by weight of sulfur, and up to 0.25% by weight of selenium, 0.06
5 One or more of the following: Calsulam in an amount of up to 0.20% by weight, and tellurium in an amount of up to 0.20% by weight (however, the total amount is 0.01
~3% by weight)
High permeability alloy. 4 0.004 to 0.2 for a Ni-Fe alloy consisting of 35 to 90% by weight of nickel, the balance being iron and impurities.
5% by weight magnesium, 0.005-0.15% by weight
sulfur, one or more of the following: 6% by weight or less of molyfden, 6% by weight or less of copper, 12% by weight or less of chromium (however, the total amount is 2% by weight or more), and an additional 0.25% by weight. Ni characterized by containing one or more of the following selenium, 0.065% by weight or less of calcilum, and 0.20% by weight or less of tellurium (however, the total amount is 0.01% by weight or more) -Fe-based high magnetic permeability alloy.