JPH1030141A - Alloy excellent in resistance to corrosion, wear, and cracking, and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alloy excellent in cracking resistance as well as in corrosion resistance and wear resistance. SOLUTION: This alloy is an alloy composed of at least one kind selected from Fe-base, Co-base, and Ni-base alloys containing, by weight, 5-40% Cr and 2-30% Mo, and further, this alloy contains at least one kind selected from 2-8% Nb, 2-8% Zr, and 4-10% Ta and further contains, if necessary, 0.01-1% REM.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alloy having excellent corrosion resistance, abrasion resistance, and crack resistance, and to a method for producing the alloy.

[0002]

2. Description of the Related Art Parts for mechanical structures, such as cylinders for mud pumps, cylinders for injection molding machines and various sliding parts, are required to be excellent in corrosion resistance, wear resistance and crack resistance.

[0003] As an alloy having excellent corrosion resistance and wear resistance used as a material for this kind of machine structural parts, for example, an Fe-based alloy containing 5 to 40% by weight of Cr and 2 to 30% by weight of Mo, Among alloys composed of at least one selected from a Co-based alloy and a Ni-based alloy, there is an alloy to which V: 8% by weight or more is added in order to further improve wear resistance.

[0004]

However, in the above-mentioned alloy, in the solidification process after melting, after the VC carbide and the mother phase are crystallized, the Cr carbide having a low melting point remains partially after crystallization of the mother phase. Eutectic structure with the parent phase, and the structure was connected in a form surrounding the crystal grains of the previously crystallized parent phase. Another problem is to further improve the crack resistance in addition to the wear resistance.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a Cr content of 5 to 40% by weight.
Mo: Fe-based alloy containing 2 to 30% by weight, Co-based alloy,
In an alloy made of at least one selected from Ni-based alloys, V is used to further increase wear resistance.
An object of the present invention is to make it possible to further improve the crack resistance of a conventional corrosion-resistant and wear-resistant alloy having excellent corrosion resistance and wear resistance to which chromium is added.

[0006]

The alloy according to the present invention, which is excellent in corrosion resistance, wear resistance and crack resistance, is as follows: Cr: 5 to 40% by weight, Mo: : 2-3
In an alloy comprising at least one selected from a Fe-based alloy, a Co-based alloy, and a Ni-based alloy containing 0%,
C: 1 to 5%, V: 4 to 8%, and Nb, Zr, Ta
At least one selected from the group consisting of Nb: 2 to 8%;
It is characterized by having a component composition containing Zr: 2 to 8% and Ta: 4 to 10%.

[0007] In an embodiment of the alloy according to the present invention having excellent corrosion resistance, wear resistance and crack resistance, REM should contain 0.02 to 1%. Can be.

[0008] The surface-modified metal member according to the present invention, which is excellent in corrosion resistance, wear resistance and crack resistance, is characterized in that it has the corrosion resistance, wear resistance and resistance described in claim 1 or 2. It is characterized in that an alloy having excellent cracking properties is formed at a desired portion of a metal member.

According to a fourth aspect of the present invention, there is provided a method for producing an alloy having excellent corrosion resistance, abrasion resistance and cracking resistance, wherein Cr is 5 to 40% and Mo is 2 to 2% by weight. In an alloy comprising at least one selected from the group consisting of an Fe-based alloy, a Co-based alloy, and a Ni-based alloy containing 30%,
%, V: 4 to 8%, and at least one selected from Nb, Zr, and Ta, Nb: 2 to 8%, Zr: 2 to 2%.
8%, Ta: in the range of 4 to 10%, and after crystallization and / or precipitation of carbides other than Cr,
Is characterized in that the Cr carbide is uniformly dispersed in a fine state having a particle size of 5 μm or less by quenching by setting the activity to an appropriate amount.

[0010] In an embodiment of the method for producing an alloy excellent in corrosion resistance, wear resistance and crack resistance according to the present invention,
As described in claim 5, REM: 0.02 to 1
%.

Further, according to a sixth aspect of the present invention, there is provided a method for producing a surface-modified metal member having excellent corrosion resistance, abrasion resistance, and crack resistance.
According to a fourth aspect of the present invention, there is provided an alloy layer in which Cr carbide is uniformly dispersed in a fine state having a particle size of 5 μm or less.

[0012]

The alloy according to the present invention, which has excellent corrosion resistance, wear resistance and crack resistance, and a method for producing the same have the above-mentioned constitutions. Among them, Cr: 5 to 40%, M
o: As the Fe-based alloy, Co-based alloy and Ni-based alloy containing 2 to 30%, for example, those having corrosion resistance as exemplified below can be used.

First, as the Fe-based alloy, austenitic stainless steel, martensitic stainless steel, ferritic stainless steel, duplex stainless steel, or the like having excellent corrosion resistance can be used.

On the other hand, as a Co-based alloy, a stellite-based alloy having excellent corrosion resistance, for example, Co—Ni—Cr—W
-Mo alloy, Co-Cr-W-Mo alloy, DS Alloy 816 (AISI 671), or the like can be used.

On the other hand, as the Ni-based alloy, an Inconel-based alloy, a Hastelloy-based alloy, a Monel-based alloy, a Colmonoy-based alloy or the like having excellent corrosion resistance is used.
Cr-Fe-W-Mo alloy, Ni-Cr-Si-Mo
A system alloy or the like can be used.

The C contained in such an alloy is
The amount of r is set to 5 to 40%. In this case, if the Cr content is less than 5%, the amount of generated Cr carbide is reduced and the wear resistance is not sufficiently improved.
Excessive amounts are not preferred because the amount of Cr carbide becomes excessively large and the toughness is reduced, and the crack resistance tends to be deteriorated.

The amount of Mo contained in the above alloy is 2
However, in this case, if the Mo content is less than 2%, the corrosion resistance is not sufficient, which is not preferable.
Conversely, if the Mo content exceeds 30%, the crack resistance tends to decrease, which is not preferable.

Further, the amount of C contained in the above alloy is 1
However, in this case, if the C content is less than 1%, the amount of hard carbide generated is small, and the improvement in wear resistance is not sufficient, which is not preferable. Conversely, the C content is 5%. If it is excessive, the amount of carbide generated becomes excessive and the crack resistance deteriorates, which is not preferable.

Further, the amount of V contained in the above alloy is 4 to 8%. In this case, if the V content is less than 4%, the amount of hard carbide formed is small, and the wear resistance is not sufficient. Conversely, if the V content is more than 8%, the V content is excessive with respect to the limit of 5% or less of the C content, which is not preferable because a eutectic structure is unlikely to be formed.

Further, N contained in the above alloy is
In at least one selected from b, Zr, and Ta, the Nb content is 2 to 8%, the Zr content is 2 to 8%,
Although the Ta content is set to 4 to 10%, in this case, Nb
If the content and the Zr content are less than 2% and the Ta content is less than 4%, the action of refining the Cr carbide becomes small, which is not preferable. Conversely, the Nb content and the Zr content are unfavorable.
If the content exceeds 8% and the Ta content exceeds 10%, Nb, Zr, T
It is not preferable because the content of a is excessive and it is difficult to form a eutectic structure.

Further, the amount of REM to be appropriately contained in the above alloy to make carbide finer is 0.02 to 1%. In this case, if the REM amount is less than 0.02%, RE
The addition of M is not preferable because the effect of carbide refinement is not sufficient, and conversely, if the REM content exceeds 1%, the crack resistance tends to decrease, which is not preferable.

[0022]

EXAMPLE 1 C, S in Fe-based alloy, Co-based alloy, Ni-based alloy
The alloy containing i, Cr, Mo, and V as shown in Table 1 and the Nb, Zr, and Ta contents as shown in Table 1 and also containing an appropriate amount of REM, except for Cr. After the crystallization of the carbides of the above, the activity of C in the liquid phase was adjusted to an appropriate amount, and the alloy was quenched to obtain an alloy in which Cr carbides were uniformly dispersed in a fine state having a particle size of 5 μm or less.

Next, the wear resistance and crack resistance of each alloy were examined. The results are shown in Table 1.

In the abrasion resistance test, an Ogoshi-type abrasion resistance tester was used, and the mating material: SKD11 (hardness HRC5
8), final load: 18.9 kgf, friction distance: 600
m, friction speed: measured under conditions of 0.76 m / sec.

In evaluating the cracking resistance during cooling of the cladding, the inner diameter of the cladding base material was 100 mm and the outer diameter was 300 m.
m, length: 2000 mm, material: SCM440 When plasma powder welding (helical build-up) of 160 A, build-up thickness: 4 mm is performed on the inner surface of a long tube of SCM440, cracks after build-up welding The presence or absence of was examined. The results are also as shown in Table 1, where ○ indicates that cracks did not occur (good build-up property), and x indicates that cracks occurred.

[0026]

[Table 1]

As shown in Table 1, all the alloys had good wear resistance and also excellent crack resistance. Moreover, it was also excellent in corrosion resistance.

Comparative Example 1 After obtaining an alloy in which the contents of C, Si, Cr, Mo, and V in the Co-based alloy were as shown in Table 2, the abrasion resistance and crack resistance were the same as in Example 1. The results were shown in Table 2.

[0029]

[Table 2]

As shown in Table 2, although the wear resistance was good for all the alloys, the crack resistance was not so good.

[0031]

According to the present invention, the alloy having excellent corrosion resistance, abrasion resistance and crack resistance is 5% to 40% by weight of Cr and 5% by weight of Mo.
In an alloy comprising at least one selected from the group consisting of Fe-based alloys, Co-based alloys, and Ni-based alloys containing 2 to 30%, C: 1 to 5%, V: 4 to 8%, and Nb, Zr,
Nb: 2-8 at least one selected from Ta
%, Zr: 2 to 8%, and Ta: 4 to 10%, the alloy is not only excellent in corrosion resistance and wear resistance, but also excellent in cracking resistance. A remarkably excellent effect is obtained that the durability when used as a material for the sliding surface of a molding machine cylinder and various sliding members can be greatly improved.

And, as described in claim 2,
By including REM: 0.02 to 1%, the carbide can be further refined, and an alloy having more excellent corrosion resistance, wear resistance, and crack resistance can be obtained. There is an effect that there is.

The surface-modified metal member according to the present invention is obtained by forming the alloy excellent in corrosion resistance, wear resistance and crack resistance according to claim 1 or 2 at a desired portion of the metal member. A remarkable effect of being a surface-modified metal member having excellent corrosion resistance, wear resistance, and crack resistance is provided.

The method for producing an alloy having excellent corrosion resistance, wear resistance, and crack resistance according to the present invention is as follows.
%, Mo: Fe-based alloy containing 2 to 30%, Co-based alloy,
C: 1-5%, V: 4-8%, and Nb,
At least one selected from Zr and Ta is Nb:
2 to 8%, Zr: 2 to 8%, Ta: 4 to 10%, and after crystallization and / or precipitation of carbides other than Cr, the activity of C in the liquid phase is adjusted to an appropriate amount. Quench, C
Since the carbides are uniformly dispersed in a fine state with a particle size of 5 μm or less, the eutectic structure surrounding the crystal grains of the mother phase that has appeared earlier and the crystal grains that have emerged later are connected as in the related art. It is possible to prevent the formation of a structure disadvantageous to such crack resistance, and it is possible to prevent not only corrosion and wear resistance, but also
A remarkable effect that an alloy excellent in crack resistance can be produced is brought about, and as described in claim 5, by containing REM: 0.02 to 1%. It is possible to further refine the carbide,
A remarkable effect is obtained that an alloy having better corrosion resistance, wear resistance and crack resistance can be produced.

In the method for producing a surface-modified metal member according to the present invention, Cr carbide is uniformly dispersed in a desired portion of the metal member in a fine state having a particle size of 5 μm or less by the method according to claim 4 or 5. Since the formed alloy layer is formed, a remarkable effect that a surface-modified metal member excellent in corrosion resistance, wear resistance, and crack resistance can be manufactured can be obtained.

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Claims (6)

[Claims] 1. Cr: 5 to 40%, Mo: 2 by weight%
In an alloy composed of at least one selected from the group consisting of Fe-based alloys, Co-based alloys, and Ni-based alloys containing C: 1 to 5%, V: 4 to 8%, and Nb, Zr,
Nb: 2-8 at least one selected from Ta
%, Zr: 2 to 8%, and Ta: 4 to 10%. An alloy excellent in corrosion resistance, wear resistance, and crack resistance. 2. The method according to claim 1, wherein the content of REM is 0.02 to 1%.
Alloy with excellent corrosion resistance, wear resistance and crack resistance described in 1. 3. An anti-corrosion, abrasion and crack resistance characterized by forming the alloy having excellent corrosion resistance, abrasion resistance and crack resistance according to claim 1 or 2 at a desired portion of a metal member. Excellent surface-modified metal member. 4. Cr: 5 to 40%, Mo: 2 by weight%
Alloy containing at least one selected from the group consisting of Fe-based alloys, Co-based alloys, and Ni-based alloys containing
C: 1 to 5%, V: 4 to 8%, and Nb, Zr, Ta
At least one selected from the group consisting of Nb: 2 to 8%;
Zr: 2 to 8%, Ta: contained in the range of 4 to 10%,
After crystallization and / or precipitation of carbides other than Cr,
Alloy with excellent corrosion resistance, wear resistance and crack resistance, characterized in that the activity of C in the liquid phase is adjusted to an appropriate amount, quenched, and Cr carbide is uniformly dispersed in a fine state having a particle size of 5 μm or less. Manufacturing method. 5. The method for producing an alloy having excellent corrosion resistance, wear resistance and crack resistance according to claim 4, wherein REM is contained in an amount of 0.02 to 1%. 6. An alloy layer in which Cr carbide is uniformly dispersed in a fine state with a particle size of 5 μm or less by a method according to claim 4 or 5 at a desired portion of the metal member. A method for producing a surface-modified metal member having excellent corrosion resistance, wear resistance, and crack resistance.