JPH02277736A - Ti-al base heat-resistant alloy - Google Patents
Ti-al base heat-resistant alloyInfo
- Publication number
- JPH02277736A JPH02277736A JP9976989A JP9976989A JPH02277736A JP H02277736 A JPH02277736 A JP H02277736A JP 9976989 A JP9976989 A JP 9976989A JP 9976989 A JP9976989 A JP 9976989A JP H02277736 A JPH02277736 A JP H02277736A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- ductility
- lightweight
- specific strength
- resistant alloy
- 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
Links
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 16
- 239000000956 alloy Substances 0.000 title claims abstract description 16
- 229910010038 TiAl Inorganic materials 0.000 claims description 10
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 229910000601 superalloy Inorganic materials 0.000 abstract description 2
- 229910004349 Ti-Al Inorganic materials 0.000 abstract 2
- 229910021362 Ti-Al intermetallic compound Inorganic materials 0.000 abstract 2
- 229910004692 Ti—Al Inorganic materials 0.000 abstract 2
- 230000007547 defect Effects 0.000 abstract 2
- 238000005266 casting Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 229910000765 intermetallic Inorganic materials 0.000 description 6
- 230000005484 gravity Effects 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000012300 argon atmosphere Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、小型過給機ロータ、航空機エンジン部品、宇
宙往還機の外殻など軽量高強度材でしかも耐熱性を必要
とする部位の構造部材に最適なＴｉＡｌ基耐熱合金に関
する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to the structure of parts that require heat resistance while being made of lightweight, high-strength materials, such as small turbocharger rotors, aircraft engine parts, and outer shells of spacecraft. This invention relates to a TiAl-based heat-resistant alloy that is optimal for parts.
ＴｉＡｌ金属間化合物は、軽量高強度材でしかも耐熱性
があり、また、温度が上昇すると強度も上昇するという
特異な特性があり、約７００℃において最高強度を示す
材料である。また、高温クリープ特性も優れ、比強度（
材料強度を比重で除した値）ではＮｉ基超超合金インコ
ネル７１３Ｇよりも高い強度を示す。The TiAl intermetallic compound is a lightweight, high-strength material that is heat resistant, and has the unique property of increasing its strength as the temperature rises, and is a material that exhibits maximum strength at about 700°C. It also has excellent high-temperature creep properties and specific strength (
(value obtained by dividing material strength by specific gravity) shows higher strength than Ni-based superalloy Inconel 713G.
しかし、ＴｔＡ／金属間化合物は、常温延性が欠如する
問題があり、実用化されていない。However, TtA/intermetallic compound has a problem of lacking room temperature ductility and has not been put into practical use.
常温Ｉ性の改善については、これまでにさまざまな方法
が提案されているが（例えば米国特許第４２９４６１５
号、特開昭５８−１２３８４７、特公昭６２−２１５な
ど）、必ずしも十分な特性が得られているとは言えない
。Various methods have been proposed so far for improving room temperature I properties (for example, U.S. Pat. No. 4,294,615).
(Japanese Patent Publication No. 58-123847, Japanese Patent Publication No. 62-215, etc.), it cannot be said that sufficient characteristics are necessarily obtained.
このため、本願発明では従来から提案されている方法よ
りも優れた常温延性を有する軽量高強度のＴｉＡｌ基耐
熱合金を提供しようとするものである。Therefore, the present invention aims to provide a lightweight, high-strength TiAl-based heat-resistant alloy that has better room-temperature ductility than conventionally proposed methods.
そこで本発明は、原子百分率でＡ／ ：４３〜５０Ｊｖ
：ｏ、ｓ 〜２９＋５ 、Ｃｒ：０．５〜３９６で残部
が実質的にＴｉから成ることを特徴とする延性・比強度
に優れるＴｉＡｌ基耐熱合金とした。Therefore, the present invention provides A/: 43 to 50 Jv in atomic percentage.
: o, s ~ 29+5, Cr: 0.5 ~ 396, and the remainder essentially consists of Ti, making it a TiAl-based heat-resistant alloy with excellent ductility and specific strength.
本発明者らは、 ＴｉＡｌ合金に種々の添加元素を組み
合わせることにより常温延性が優れ、しかも強度も向上
した優れたＴｉＡｌ基耐熱合金が得られることを見い出
した。The present inventors have discovered that by combining various additive elements with a TiAl alloy, an excellent TiAl-based heat-resistant alloy with excellent cold ductility and improved strength can be obtained.
以下に本発明合金における成分組成限定理由を述べる。The reasons for limiting the composition of the alloy of the present invention will be described below.
ＡＩ：ＡｌはＴｉとともに本発明合金の主要元素であり
、本合金の基本はＴｉＡＩというＬｌｏ構造を有する金
属間化合物にある。AI: Al is a main element of the present alloy together with Ti, and the basis of the present alloy is TiAI, an intermetallic compound having an Llo structure.
ＴｉＡｌ金属間化合物は、Ｔｉ−々二元系状態図におい
てＡｌ ５０ａｔ；％を中心に存在する。この合金系に
おいて常温延性を改善するためには、結晶粒を微細化す
ることが必要であり、ＡＺ５０ａｔ、９６よりもＡＩ−
１ｅａｎ側に存在するＴｉＡＩ −Ｔｉ３Ａ／２相領域
に成分を近づけた方が、組織は微細化し、良好な常温延
性が得られる。一方、ＡＩ量が４３ａｔ、４以下である
とＴｉＡＩ−Ｔｉ３Ａ／の完全な２相領域となり、組織
が微細化することによる効果よりもＴｉ３Ａ／が多く存
在することによる常温延性の低下の影響が大きくなり、
良好な常温延性は得られない。したがってＡＩ量は４３
〜５ Ｑ ａｔ０％とする。The TiAl intermetallic compound exists mainly at 50 at% of Al in the Ti-2 binary system phase diagram. In order to improve room temperature ductility in this alloy system, it is necessary to refine the crystal grains, and AI-
When the components are brought closer to the TiAI-Ti3A/2 phase region existing on the 1ean side, the structure becomes finer and better room-temperature ductility is obtained. On the other hand, when the AI amount is 43at, 4 or less, it becomes a complete two-phase region of TiAI-Ti3A/, and the effect of the decrease in cold ductility due to the presence of a large amount of Ti3A/ is greater than the effect of finer structure. Become,
Good cold ductility cannot be obtained. Therefore, the AI amount is 43
~5 Q at 0%.
ｖ：ｖは、Ｔｉ、ＩＶ金属間化合物の組織の微細化に効
果がある、ｏ、ｓａｔ、９６ 未満では効果はなく、
また２ ａｔ、％よりも多く添加しても、多く添加した
ことの効果が発揮されない。したがってＶ ＩＬ′：ｒ
、０．５〜２ ａｔ、％とする。v: v is effective in refining the structure of Ti and IV intermetallic compounds; o, sat, less than 96 has no effect;
Moreover, even if more than 2 at.% is added, the effect of adding more will not be exhibited. Therefore V IL′:r
, 0.5 to 2 at,%.
Ｃｒ：Ｃｒは本発明を特徴づける添加元素である。Cr: Cr is an additive element that characterizes the present invention.
Ｃｒの本発明合金における役割は主に２つあり。Cr has two main roles in the alloy of the present invention.
１つは常温延性を改善する。もう１つの役割はＴｉＡｌ
金属間化合物の耐酸化性を向上させることにある。Ｃｒ
量がＱ、５ａｔ％未満ではその効果は十分ではなく、ま
た３ ａｔ９６を超えるものでは、延性及び強度を低下
させる。したがっては０５〜３ａｔ、９６とする。One is to improve cold ductility. Another role is TiAl
The objective is to improve the oxidation resistance of intermetallic compounds. Cr
If the amount Q is less than 5 at%, the effect is not sufficient, and if it exceeds 3 at96, the ductility and strength are reduced. Therefore, it is set as 05-3at, 96.
本発明を実施例により具体的に説明する。 The present invention will be specifically explained with reference to Examples.
第１表に試験を行った材料の成分および常温引張試験結
果を示す。試験材はアルゴン雰囲気にて非消耗アーク溶
解炉を用いて溶製し、溶製後アルゴン雰囲気中にて９０
０℃、５時間の均一化処理を施し常温引張試験に供した
。Table 1 shows the components of the materials tested and the results of the room temperature tensile test. The test material was melted using a non-consumable arc melting furnace in an argon atmosphere, and after melting, it was melted at 90% in an argon atmosphere.
It was subjected to a homogenization treatment at 0°C for 5 hours and then subjected to a room temperature tensile test.
第１表に示される結果より、明らかなように比較材に比
べ本発明材は、伸び、絞りが良好であり、良好な延性を
示す。特に絞りは比較材よりも明らかに良い値を示す。From the results shown in Table 1, it is clear that the material of the present invention has better elongation and reduction, and exhibits better ductility than the comparative materials. In particular, the aperture value is clearly better than that of the comparative materials.
また、■、Ｃｒを添加したことにより比重が３゜７から
３．９へと上昇するが引張強さがＴｉ４８Ａ／材の３９
．３＃ｆ／−から５２．０＃ｆ ／−と向上し、比強度
（引張強さ／比重）でも、３９．３７３．７から５２．
０ ／ ３．９と約２５％向上する。Also, by adding Cr, the specific gravity increases from 3°7 to 3.9, but the tensile strength is 39° compared to that of Ti48A/material.
．． The specific strength (tensile strength/specific gravity) improved from 39.373.7 to 52.0#f/-.
0/3.9, an improvement of about 25%.
以上説明のとおり本発明によれば、延性にすぐれる高い
比強度のＴｉＡｌ基耐熱合金を得ることができ、その結
果、過給機のロータ、航空機エンジン部品及び宇宙往還
機の外殻など高比強度筒 １
表As explained above, according to the present invention, it is possible to obtain a TiAl-based heat-resistant alloy with excellent ductility and high specific strength. Strength cylinder 1 table
Claims (1)
、Ｃｒ：０．５〜３％で残部が実質的にＴｉから成るこ
とを特徴とした延性・比強度に優れるＴｉＡｌ基耐熱合
金。Al: 43-50%, V: 0.5-2% in atomic percentage
A TiAl-based heat-resistant alloy having excellent ductility and specific strength, characterized by comprising Cr: 0.5 to 3% and the remainder substantially consisting of Ti.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9976989A JPH02277736A (en) | 1989-04-19 | 1989-04-19 | Ti-al base heat-resistant alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9976989A JPH02277736A (en) | 1989-04-19 | 1989-04-19 | Ti-al base heat-resistant alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02277736A true JPH02277736A (en) | 1990-11-14 |
Family
ID=14256178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9976989A Pending JPH02277736A (en) | 1989-04-19 | 1989-04-19 | Ti-al base heat-resistant alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02277736A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05186842A (en) * | 1991-07-05 | 1993-07-27 | Nippon Steel Corp | Formed product of tial-based intermetallic compound having high strength and its production |
| JPH0711369A (en) * | 1991-08-29 | 1995-01-13 | Natl Res Inst For Metals | Polycrystal body of high ductility ti-al intermetallic compound |
| DE102009050603B3 (en) * | 2009-10-24 | 2011-04-14 | Gfe Metalle Und Materialien Gmbh | Process for producing a β-γ-TiAl base alloy |
| JP2016113683A (en) * | 2014-12-17 | 2016-06-23 | 三菱日立パワーシステムズ株式会社 | Steam turbine rotor, steam turbine using the steam turbine rotor, and thermal electric power plant using the steam turbine |
-
1989
- 1989-04-19 JP JP9976989A patent/JPH02277736A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05186842A (en) * | 1991-07-05 | 1993-07-27 | Nippon Steel Corp | Formed product of tial-based intermetallic compound having high strength and its production |
| JPH0711369A (en) * | 1991-08-29 | 1995-01-13 | Natl Res Inst For Metals | Polycrystal body of high ductility ti-al intermetallic compound |
| DE102009050603B3 (en) * | 2009-10-24 | 2011-04-14 | Gfe Metalle Und Materialien Gmbh | Process for producing a β-γ-TiAl base alloy |
| WO2011047937A1 (en) | 2009-10-24 | 2011-04-28 | Gfe Metalle Und Materialien Gmbh | Method for producing a ss-γ-tial base alloy |
| JP2012527533A (en) * | 2009-10-24 | 2012-11-08 | ゲーエフエー メタレ ウント マテリアリエン ゲーエムベーハー | Method for producing β-γ-TiAl based alloy |
| US8668760B2 (en) | 2009-10-24 | 2014-03-11 | Gfe Metalle Und Materialien Gmbh | Method for the production of a β-γ-TiAl base alloy |
| JP2016113683A (en) * | 2014-12-17 | 2016-06-23 | 三菱日立パワーシステムズ株式会社 | Steam turbine rotor, steam turbine using the steam turbine rotor, and thermal electric power plant using the steam turbine |
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