JPH07256363A - Mold for forming thin plate material and method for forming thin plate material of oxide dispersion strengthened alloy using this mold - Google Patents

Abstract

(57) [Abstract] [Purpose] A mold having excellent durability and low cost, which is suitable for molding an oxide dispersion strengthened alloy (ODS alloy) thin plate material, and an ODS alloy thin film using this mold. Provided is a method for easily forming a plate material. [Structure] When isothermally molding a thin plate material 18 of an oxide dispersion strengthened alloy, at least a part of the molding surfaces of the molds 14 and 16 is welded or sprayed with C: 0.20 wt% or less, M
n: 1.0 to 2.0% by weight, Ni: 9.0% by weight or less,
Cr: 20 to 30% by weight, Mo: 5.0% by weight or less,
B: An oxide dispersion strengthened alloy thin plate material 18 is molded using a thin plate material molding die in which a Fe-based amorphous material containing 2.0 to 4.0% by weight is coated to form the protective layers 10 and 12. To do.

Description

Detailed Description of the Invention

[0001]

The present invention relates to oxide dispersion strengthening (Ox
side Dispersion Strengthen
(ed, ODS) alloy thin plate material and a method for forming an oxide dispersion strengthened alloy thin plate material using this mold.

[0002]

2. Description of the Related Art Oxide dispersion strengthened alloys, such as the sheet material of MA956, a product of Inco, USA, have excellent high-temperature properties, but commonly used Ni, Co-based alloys, such as the USA Cabot's Hastelloy
Compared with thin plate materials such as X (registered trademark) and HA188 manufactured by Cabot Corp. of the United States, the moldability is extremely poor. For this reason, the MA956 can be relatively easily subjected to simple bending by preheating up to about 500 ° C., but it is generally considered extremely difficult to perform deep drawing with drawing applied thereto. ing. According to the technical data of Inco, which is the developer and supplier of MA956, it is recommended to perform isothermal molding (molding the object to be molded and the mold at the same temperature) at about 650 to 800 ° C. , The details of the method are not described.

A technique for forming an undercoating and a release coating on the surface of a molding die is known (for example, Japanese Patent Laid-Open No. Hei 5 (1999) -58242).
No. 245848), there is no known technique for forming a protective layer made of an Fe-based amorphous overlay material on a forming die for forming an oxide dispersion strengthened alloy thin plate material.

[0004]

Therefore, when a test apparatus for isothermally molding MA956 thin plate material was manufactured and a cylindrical deep drawing test was carried out in the range of room temperature to 800 ° C., the range of 500 to 750 ° C. was confirmed. Although it was confirmed that the moldability was remarkably improved by the above method, the following problems were encountered. That is, when the molding temperature exceeds 600 ° C., the existing mold material has a very short molding life, and in order to solve this, an extremely expensive superalloy must be used.

Oxide dispersion strengthened alloys such as MA956 (OD
When isothermally molding a thin plate material of (S alloy) in the temperature range of 500 to 800 ° C., there is a problem of the above-mentioned life of the mold, but the contents are summarized in Table 1. In addition, Table 1 shows
In the case of isothermally molding MA956 thin plate material at 500 to 700 ° C, the star mark in the table indicates a fatal problem.
The mark indicates that improvement is necessary.

[0006]

[Table 1]

As shown in Table 1, when a superalloy (vacuum casting) is used as a mold material, there is a problem that the durability is good, but it is extremely expensive. When used as a mold overlay material, there is a problem that the durability is normal (medium) but relatively expensive.
From these things, it is necessary to find a mold overlay material that satisfies the following two conditions. (1) The durability when used at a temperature of 800 ° C. or lower is superior to that of the stellite-based overlay material. (2) In terms of cost, it should be comparable to heat-resistant steel and cheaper than stellite-based overlay materials.

In order to solve the above problems, the present inventor has conducted various experiments, and as a result, AR of Armtech Inc. in the US
MACOR-M, ARMACOR-C (both are registered trademarks) Mn-Cr-B-Fe such as wire for amorphous overlaying
It has been found that it is preferable to use an amorphous facing material made of a system alloy or a Mn-Ni-Cr-Mo-B-Fe system alloy. These results are shown in Table 2 in comparison with the conventional mold material. In Table 2, regarding the * mark of the superalloy (casting), the hardness at room temperature is relatively low, but the superalloy contains a large amount of high-temperature strength strengthening elements such as Ti and Al. It is considered that the decrease in hardness in the high temperature range is smaller than that of the mold material.

[0009]

[Table 2]

The present invention has been made in view of the above points, and an object of the present invention is to provide a metal mold suitable for molding an oxide dispersion strengthened alloy thin plate material, which has excellent durability and low cost,
Another object of the present invention is to provide a method for easily forming an oxide dispersion strengthened alloy thin plate material using this mold.

[0011]

In order to achieve the above object, the thin plate material molding die of the present invention, as shown in FIG. 1, has C: 0.
20% by weight or less, Mn: 1.0 to 2.0% by weight, Ni:
9.0 wt% or less, Cr: 20 to 30 wt%, Mo:
F containing 5.0% by weight or less and B: 2.0 to 4.0% by weight
It is characterized in that the protective layers 10 and 12 made of a weld coating layer or a thermal spray coating layer of an e-type amorphous material are formed. As described above, Mn is 1.0 to 2.0% by weight, preferably 1.2 to 1.6% by weight. If it is less than this range, not only is it difficult for the alloy to become amorphous during welding or thermal spraying, but also the hardness tends to decrease.
If it exceeds this range, it tends to crack and become brittle. C
r is 20 to 30% by weight, preferably 22 as described above.
~ 27% by weight. If it is less than this range, the alloy becomes hard to become amorphous during welding or thermal spraying, and the high temperature strength and oxidation resistance tend to be lowered, while if it exceeds this range, it tends to crack and become brittle. As described above, C is 0.20% by weight or less, preferably 0.12.
It is less than or equal to weight%. If it exceeds this range, it tends to crack during construction. As described above, Ni is 9.0% by weight.
It is preferably 6.0% by weight or less. If it exceeds this range, sufficient hardness tends not to be obtained. Mo is, as described above, 5.0% by weight or less, preferably 3.0.
It is less than or equal to weight%. If it exceeds this range, it tends to be difficult to crack or become amorphous during construction. As described above, B is in the range of 2.0 to 4.0% by weight, preferably 2.5.
Is in the range of up to 3.5% by weight. If it is less than 2.0% by weight, it tends to be difficult to become amorphous during construction.
If it exceeds 4.0% by weight, it tends to crack during construction or become brittle even if it becomes amorphous. As shown in FIG. 1 and FIG. 2, when the usage example is shown, the mold is a movable mold (punch) 1
It is preferable to use a deep-drawing molding die composed of 4 and a fixed die (die) 16. Reference numeral 18 is an oxide dispersion strengthened alloy (ODS alloy) thin plate material, and 20 is a wrinkle retainer. In the protective layers 10 and 12, the movable mold 14 and the fixed mold 16 are OD.
It is provided in a portion that is in sliding contact with the S alloy thin plate material 18 or in a portion that is slightly wider than the portion that is in sliding contact.

The ODS alloy thin plate material forming method of the present invention comprises:
When isothermally molding the thin plate material 18 of the oxide dispersion strengthened alloy (ODS alloy), C: 0.20 wt% or less, Mn: 1.
0 to 2.0 wt%, Ni: 9.0 wt% or less, Cr: 2
0-30% by weight, Mo: 5.0% by weight or less, B: 2.0
Characterized in that the oxide-dispersion-strengthened alloy thin plate material 18 is molded using a thin plate material molding die in which the Fe-type amorphous material containing about 4.0 wt% is coated to form the protective layers 10 and 12. There is. The isothermal molding temperature is in the range of 500 to 800 ° C, preferably 650 to 750 ° C. If it is less than this range, the moldability is poor, and even if it can be molded, the material tends to be uneven due to the influence of processing.
If it exceeds this range, the moldability tends to decrease, and at the same time, the oxidation and wear of the mold tend to become remarkable.

The thickness of the oxide dispersion strengthened alloy thin plate material 18 is
Range of 0.2-3.0mm, preferably 0.5-1.5mm
Is. If it is less than this range, the performance (for example, ductility) of the ODS plate itself tends to be deteriorated, and thus the formability tends to be poor. In addition, a large-sized device is required, and the mold structure tends to be complicated. According to the above method, as shown in FIG. 1, the ODS alloy thin plate material 18 is placed on the fixed mold 16, the end portion is pressed and fixed by the wrinkle retainer 20, and then the movable mold 14 is lowered. As shown in FIG. 2, it is suitable to use the ODS alloy thin plate material 18 as a method for deep drawing (for example, cylindrical deep drawing).

[0014]

EXAMPLES The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited to the following examples, and various modifications can be made as appropriate. Example 1 A constant temperature deep drawing tester as shown in FIG.
A formability test was conducted using MA956 thin plate material manufactured by Inco as an alloy. Both the movable mold 14 and the fixed mold 16 are made of heat-resistant steel (SUH310) and AR of Arm Tech Co., Ltd.
MACOR-M (registered trademark) overlay material (1.4Mn-27
Cr-Fe) having a thickness of 1.0 mm was welded to form the protective layers 10 and 12. Movable mold 14
Has an outer diameter A of 33 mm and the fixed mold 16 has an inner diameter B of 35.6 mm.
Met. Further, boron nitride powder, which is a lubricant, was applied to the surfaces of the molds 14 and 16. As shown in FIG. 1, as a test piece, MA956 manufactured by Inco Co., Ltd. was mounted on the fixed mold 16.
A thin plate material 18 (diameter 64 mm, thickness 1.0 mm) was placed, and the end portion was pressed by the wrinkle presser 20 and fixed. The temperature of the molds 14 and 16 and the temperature of the test piece are both heated to 700 ° C., and the molding speed (moving speed of the movable mold 14) is 10 to 200 mm / mi.
As shown in FIG. 2, the test piece was subjected to deep cylindrical drawing as n. This molding operation was repeated 30 times,
No damage occurred on the surfaces of the molds 14 and 16.

Comparative Example 1 As a movable mold and a fixed mold, those without the protective layers 10 and 12, that is, a heat resistant steel (SUH310) alone were used, and the MA956 thin plate material was molded under the same conditions as in Example 1. A sex test was conducted. As a result, many streaks were generated on the surface of the movable mold and the surface of the fixed mold by one molding operation.

[0016]

Since the present invention is configured as described above, it has the following effects. (1) Oxide dispersion strengthened alloy (ODS alloy) thin plate material can be easily formed at a comparatively low cost. Therefore, parts such as a gas turbine combustor liner and a jet engine combustor liner can be manufactured. Deep drawing can be easily performed, and the service lives of these parts can be improved all at once. (2) The durability of the mold provided with the protective layer is significantly improved, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a state before an ODS alloy thin plate material is molded using a thin plate material molding die of the present invention.

FIG. 2 is an explanatory cross-sectional view showing a state where an ODS alloy thin plate material is being molded from the state shown in FIG.

[Explanation of symbols]

 10 Protective layer made of amorphous material 12 Protective layer made of amorphous material 14 Movable die 16 Fixed die 18 ODS alloy thin plate material 20 Wrinkle holder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinichiro Nomi 1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries Ltd. Akashi factory (72) Inventor Yoshihiro Matsuda 1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries Akashi Factory Co., Ltd.

Claims (6)

[Claims] 1. C: on at least a part of the molding surface.
0.20% by weight or less, Mn: 1.0 to 2.0% by weight, N
i: 9.0 wt% or less, Cr: 20 to 30 wt%, M
O: 5.0 wt% or less, B: 2.0 to 4.0 wt% Fe-based amorphous material weld coating layer or thermal spray coating layer formed protective layer, characterized by forming a thin plate material Mold for. 2. The thin plate material molding mold according to claim 1, wherein the mold is a deep drawing mold. 3. When isothermally molding a thin plate material of an oxide dispersion strengthened alloy, C: 0.20% by weight or less, Mn: 1.0-by welding or thermal spraying on at least a part of the mold surface.
2.0 wt%, Ni: 9.0 wt% or less, Cr: 20-
30% by weight, Mo: 5.0% by weight or less, B: 2.0 to
Oxide dispersion strengthening characterized by forming an oxide dispersion strengthened alloy thin plate material using a thin plate material molding die coated with a Fe-based amorphous material containing 4.0% by weight to form a protective layer. Forming method of thin alloy sheet. 4. The method for molding an oxide dispersion strengthened alloy thin plate material according to claim 3, wherein the isothermal molding temperature is in the range of 500 to 800 ° C. 5. The oxide-dispersion strengthened alloy thin plate material has a thickness of 0.
The method for forming an oxide dispersion strengthened alloy thin plate material according to claim 3 or 4, wherein the thickness is in the range of 2 to 3.0 mm. 6. The method of forming an oxide dispersion strengthened alloy thin plate material according to claim 3, 4 or 5, wherein the oxide dispersion strengthened alloy thin plate material is subjected to deep drawing.