JPH08253830A - Production of single-crystal ni-base alloy casting having high single-crystallization ratio - Google Patents

Production of single-crystal ni-base alloy casting having high single-crystallization ratio

Info

Publication number
JPH08253830A
JPH08253830A JP8169895A JP8169895A JPH08253830A JP H08253830 A JPH08253830 A JP H08253830A JP 8169895 A JP8169895 A JP 8169895A JP 8169895 A JP8169895 A JP 8169895A JP H08253830 A JPH08253830 A JP H08253830A
Authority
JP
Japan
Prior art keywords
alloy
crystal
seed crystal
precision casting
casting mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8169895A
Other languages
Japanese (ja)
Inventor
Akira Mihashi
章 三橋
Original Assignee
Mitsubishi Materials Corp
三菱マテリアル株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Materials Corp, 三菱マテリアル株式会社 filed Critical Mitsubishi Materials Corp
Priority to JP8169895A priority Critical patent/JPH08253830A/en
Publication of JPH08253830A publication Critical patent/JPH08253830A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Summary] [Objective] To produce a single crystal Ni-base alloy casting having a high single crystallization rate. [Composition] A boddle cavity is provided at the lower end of a product cavity through a narrowed portion, and the pond cavity is a closed space with the upper end of a Ni-based alloy seed crystal exposed at the center of the bottom, and A precision casting mold having a structure in which the lower end surface of the alloy seed crystal is exposed on the bottom surface of the mold is used, and the Ni-based alloy seed crystal is Cr: 9 to 1 in weight%.
1%, Mo: 0.5 to 0.8%, W: 5.5 to 6.8
%, Ta: 5.2-6%, Al: 5-6%, Ti: 1.
8-2.5%, Co: 4.2-4.8%, Re: 0.0
5 to 0.5%, and if necessary, Si: 0.
A single-crystal Ni-base alloy casting having the same composition as the Ni-base alloy seed crystal is manufactured by containing a Ni-base alloy having a composition of 01 to 0.3% and the balance of Ni and inevitable impurities. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a single crystal Ni-base alloy casting with a high single crystallization rate.

[0002]

2. Description of the Related Art Conventionally, generally, the crystal orientation is, for example, (10
0) Single-crystal Ni-base alloy castings having a unidirectionally solidified structure are superior in high temperature strength to ordinary Ni-base alloy castings, and thus are widely used in practical applications as engine blades for aircraft and land-based gas turbines. Has been done. Further, the single crystal Ni-based alloy casting is shown in a schematic vertical sectional view in FIG.
And, for example, as shown in FIG. 7 of Japanese Patent Publication No. 5-69079, the narrowed portion 1 is provided at the lower end of the product cavity portion 1a.
A precision casting mold 1 having a structure in which a bottom-opening puddle cavity portion 1c is provided via b is used.
Is placed on a cooling plate having a Ni-based alloy seed crystal 2 set in the center of the upper surface, for example, a water-cooled copper plate 3, the bath pool cavity 1c is directly adjacent to the upper surface of the cooling plate 3, and then placed in the heating zone. It is also known that it is manufactured by casting a Ni-based alloy molten metal in the placed precision casting mold, and then gradually moving the precision casting mold from below to outside the heating zone and cooling.

[0003]

On the other hand, in recent years, for example, various gas turbine engines are strongly required to have a high output, and accordingly, the engines are also tending to be large in size. When using a casting manufacturing method, for example, when a large engine blade is manufactured, a phenomenon that single crystallization is reduced appears, and this phenomenon becomes more remarkable as the size becomes larger, and the decrease in high temperature strength is unavoidable at present. Is.

[0004]

Therefore, the present inventors have
From the viewpoints described above, as a result of conducting research by paying attention to the above-mentioned conventional method in order to manufacture a single crystal Ni-based alloy casting that exhibits a high single crystallization rate even if the size is increased, (a) As shown in FIG. 2 (a) to 2 (d), the closed space in which the upper end of the Ni-based alloy seed crystal 2 is exposed at the center of the bottom of the pool 1c is shown in FIG. 2 (a) to (d). That is, a closed space such as a spherical shape, a disk shape, or a cylindrical shape is formed, and the lower end surface of the Ni-based alloy seed crystal is exposed at the bottom surface of the mold, and the bottom surface of the mold and the seed material when placed on a cooling plate. Using a precision casting mold having a structure in which the lower end surface of the crystal is brought into contact with the cooling plate, (b) and the Ni-based alloy seed crystal and the Ni-based alloy molten metal (cast) cast in the precision casting mold, % By weight (hereinafter,% means% by weight), C
r: 9 to 11%, Mo: 0.5 to 0.8%,
W: 5.5 to 6.8%, Ta: 5.2 to 6%, A
1: 5 to 6%, Ti: 1.8 to 2.5%,
Co: 4.2 to 4.8%, Re: 0.05 to 0.5
%, And further, with or without Si: 0.01 to 0.3%, a Ni-based alloy having a composition consisting of Ni and inevitable impurities, and is produced as a result. According to the research result, the single crystal Ni-based alloy castings have a large single crystal crystallization rate even if they are large.

The present invention has been made based on the above-mentioned research results, and at the lower end of the product cavity portion, a hot water pool cavity portion is provided through a narrowing portion, and the hot water pool cavity portion is centered on the bottom portion. A precision casting mold having a structure in which the upper end of the Ni-based alloy seed crystal is exposed and the lower end face of the Ni-based alloy seed crystal is exposed at the bottom face of the mold, and the precision casting mold is placed on a cooling plate. After placing, the bottom surface of the mold and the bottom surface of the seed crystal are brought into contact with the cooling plate, and N is applied to the precision casting mold placed in the heating zone.
The i-based alloy melt was cast, and the Ni-based alloy seed crystal and N
Cr: 9 to 11%, Mo:
0.5-0.8%, W: 5.5-6.8%, T
a: 5.2-6%, Al: 5-6%, T
i: 1.8 to 2.5%, Co: 4.2 to 4.8%,
Re: 0.05-0.5%, and Si:
0.01 to 0.3%, or not, and the rest being composed of a Ni-based alloy having a composition of Ni and inevitable impurities, and subsequently, the precision casting mold is gradually heated from below. The method is characterized by a method for producing a single crystal Ni-based alloy casting having a high single crystallization rate by shifting out of the zone and cooling.

The composition of the Ni-base alloy seed crystal and the molten Ni-base alloy cast in the precision casting mold according to the method of the present invention is described in Japanese Patent Laid-Open No. 3-10039 / 1993, "Ni-base excellent in high temperature strength and high temperature corrosion resistance." Same as that disclosed as “single crystal alloy”, but single crystal N of this composition
When the i-based alloy casting is manufactured using the precision casting mold having the structure shown in FIG. 3, a decrease in the single crystallization rate cannot be avoided when the i-based alloy casting is large in size, and the i-based alloy castings shown in FIGS. When manufactured using a precision casting mold having the structure shown in (4), a large single crystal Ni-based alloy casting also exhibits a high single crystallization rate.

[0007]

Next, the method of the present invention will be specifically described with reference to examples. First, in a high frequency induction vacuum melting furnace, Cr:
10.3%, Mo: 0.64%, W: 6.2%, Ta:
5.6%, Al: 5.2%, Ti: 2.3%, Co:
Ni-based alloy for producing a seed crystal (a) having a composition of 4.6%, Re: 0.23%, Ni and inevitable impurities, Cr: 10.8%, Mo: 0.58%, W: 6.1
%, Ta: 5.6%, Al: 5.7%, Ti: 2.3
%, Co: 4.5%, Re: 0.12%, Si: 0.1
6%, Ni and unavoidable impurities: Ni-based alloys for production of seed crystals (b) having the composition of the rest were melted,
A spiral selector (aluminum shell mold) having the same shape as described in JP-A-2-92888 manufactured by the lost wax method was cast to have a crystal orientation of (100) and a diameter: 10 mm × Length: Ni-based alloy seed crystals (a) and (b) each having a dimension of 100 mm were produced.

The lost wax method is also used as the precision casting mold body, and in each case, the spout cavity part: upper end diameter 150 mm × height 100 mm, riser cavity part: diameter 60 mm × height 40 mm, product cavity part: width 70 mm x thickness 10 mm x length 150
mm, squeezing part: Inner diameter 3.5 mm x length 6.5 mm, but each of the pools of puddles (1) maximum diameter 25 mm x minimum diameter 17 mm x height 1
Frusto-conical shape shown in FIG. 1 with dimensions of 2 mm, (2)
The spherical shape shown in FIG. 2 (a) having a diameter of 24 mm, (3)
The disk shape shown in FIG. 2 (b) having a diameter of 26 mm × height 14 mm, (4) the column shape shown in FIG. 2 (c) having a diameter of 20 mm × height 20 mm, (5) ) Five kinds of precision casting mold bodies (thickness: 6 mm alumina-based shell mold) having the disk shape shown in Fig. 2 (d) having a diameter of 25 mm and a height of 15 mm are manufactured. A seed crystal (a) or (b) of the above-mentioned Ni-based alloy in the combination shown in Table 1 on the bottom was cut and the diameter:
The size of the seed crystal was adjusted to 6 mm × length: 23 mm and incorporated, and the upper end of the seed crystal was exposed in the molten metal cavity and the lower end of the seed crystal was exposed to the bottom of the mold to form a precision casting mold.

Next, the precision casting mold is placed on the upper surface of a water-cooled copper plate (cooling plate), the bottom face of the mold and the lower end face of the seed crystal are brought into contact with the cooling plate, and in this state, the precision casting mold is
It was heated to 1550 ° C. in a heating zone formed around it, and the combinations shown in Table 1 were also melted in the high frequency induction vacuum melting furnace, Cr: 9.6%, M
o: 0.72%, W: 6.6%, Ta: 5.3%, A
1: 5.6%, Ti: 1.9%, Co: 4.6%, R
e: 0.41%, Ni and unavoidable impurities: Ni-based alloy melt (1) having the composition of the rest, or Cr: 1
0.6%, Mo: 0.56%, W: 6.7%, Ta:
5.8%, Al: 5.9%, Ti: 2.3%, Co:
4.4%, Re: 0.21%, Si: 0.13%, Ni
And inevitable impurities: a Ni-based alloy melt (2) having the composition of the rest is cast, and after the casting, the heating zone is set to 15
While maintaining at 50 ℃, the precision casting mold 220mm /
Method 1 to 5 of the present invention by pulling down vertically at a speed of hr
Was carried out to produce a single crystal Ni-based alloy casting having a crystal orientation of (100).

For the purpose of comparison, the pouring cavity portion of the precision casting mold has an open bottom surface as shown in FIG. 3 and has dimensions of bottom surface diameter: 45 mm × height: 20 mm, and the center of the cooling plate. Seed crystal (a) set to
Conventional methods 1 and 2 were performed under the same conditions except that the dimensions of (b) and (b) were 10 mm in diameter and 8 mm in thickness, respectively, and the same single crystal Ni-based alloy castings were produced. The area ratio of the crystal orientation (100) in the horizontal cross sections of the upper end portion, the central portion, and the lower end portion of the single crystal Ni-based alloy casting obtained as a result was measured by image analysis of the macro-etched surface.
The measurement results are shown in Table 1.

[0011]

[Table 1]

[0012]

From the results shown in Table 1, the method of the present invention 1 to
According to No. 5, even if the single crystal Ni-based alloy casting is large, the single crystal Ni has a remarkably high single crystallization rate as compared with the conventional methods 1 and 2.
It is clear that base alloy castings can be produced. As described above, the method of the present invention enables the production of a single crystal Ni-based alloy casting with a high single crystallization rate, and therefore greatly contributes to the promotion of upsizing of various gas turbine engines, for example. Is.

[Brief description of drawings]

FIG. 1 is one of precision casting molds used in the method of the present invention.
It is a schematic longitudinal cross-sectional view showing an example.

FIG. 2 is a schematic vertical sectional view of an essential part showing a modified example of the precision casting mold used in the method of the present invention.

FIG. 3 is a schematic vertical sectional view illustrating a precision casting mold used in a conventional method.

Claims (1)

[Claims]
1. A cold storage pool is provided at the lower end of the product cavity through a narrowed portion, and the cold storage cavity is a closed space in which the upper end of the Ni-based alloy seed crystal is exposed at the bottom center. Also, using a precision casting mold having a structure in which the lower end face of the Ni-based alloy seed crystal is exposed at the bottom face of the mold, the precision casting mold is placed on a cooling plate, and the bottom face of the mold and the lower end face of the seed crystal are cooled. The Ni-based alloy molten metal is cast into the precision casting mold placed in the heating zone and brought into contact with a plate, and the Ni-based alloy seed crystal and the Ni-based alloy molten metal are contained in a weight percentage of
Then, Cr: 9 to 11%, Mo: 0.5 to 0.8
%, W: 5.5 to 6.8%, Ta: 5.2 to 6%, Al: 5 to 6%, Ti: 1.8 to 2.5
%, Co: 4.2 to 4.8%, Re: 0.05 to 0.5
%, And further contains Si: 0.01 to 0.3%, or does not contain Si and the balance is Ni and a composition having an unavoidable impurity.
Production of a single crystal Ni-based alloy casting having a high single crystallization rate, which is characterized by comprising an i-based alloy, and subsequently moving the above precision casting mold from below to gradually outside the heating zone and cooling. Method.
JP8169895A 1995-03-14 1995-03-14 Production of single-crystal ni-base alloy casting having high single-crystallization ratio Pending JPH08253830A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8169895A JPH08253830A (en) 1995-03-14 1995-03-14 Production of single-crystal ni-base alloy casting having high single-crystallization ratio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8169895A JPH08253830A (en) 1995-03-14 1995-03-14 Production of single-crystal ni-base alloy casting having high single-crystallization ratio

Publications (1)

Publication Number Publication Date
JPH08253830A true JPH08253830A (en) 1996-10-01

Family

ID=13753604

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8169895A Pending JPH08253830A (en) 1995-03-14 1995-03-14 Production of single-crystal ni-base alloy casting having high single-crystallization ratio

Country Status (1)

Country Link
JP (1) JPH08253830A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6251181B1 (en) * 1999-06-18 2001-06-26 Virginia Semiconductor Method for forming a solid solution alloy crystal
GB2364327A (en) * 2000-05-20 2002-01-23 Rolls Royce Plc Single crystal seed alloy
FR2825722A1 (en) * 2001-06-11 2002-12-13 Howmet Res Corp Grain for molding a single crystal article, mold and method of use thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6251181B1 (en) * 1999-06-18 2001-06-26 Virginia Semiconductor Method for forming a solid solution alloy crystal
US6428618B2 (en) * 1999-06-18 2002-08-06 Virginia Semiconductor, Inc. Method for forming a solid solution alloy crystal
GB2364327A (en) * 2000-05-20 2002-01-23 Rolls Royce Plc Single crystal seed alloy
GB2364327B (en) * 2000-05-20 2004-10-06 Rolls Royce Plc Single crystal seed alloy
FR2825722A1 (en) * 2001-06-11 2002-12-13 Howmet Res Corp Grain for molding a single crystal article, mold and method of use thereof
US7575038B2 (en) 2001-06-11 2009-08-18 Howmet Research Corporation Single crystal seed
US7810547B2 (en) 2001-06-11 2010-10-12 Howmet Research Corporation Single crystal seed

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