JPH10156473A - Hot working method of tial base intermetallic compound - Google Patents
Hot working method of tial base intermetallic compoundInfo
- Publication number
- JPH10156473A JPH10156473A JP31400096A JP31400096A JPH10156473A JP H10156473 A JPH10156473 A JP H10156473A JP 31400096 A JP31400096 A JP 31400096A JP 31400096 A JP31400096 A JP 31400096A JP H10156473 A JPH10156473 A JP H10156473A
- Authority
- JP
- Japan
- Prior art keywords
- intermetallic compound
- tial
- sheath
- forging
- based intermetallic
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、ＴｉＡｌ基金属
間化合物の熱間加工法に関する。The present invention relates to a method for hot working a TiAl-based intermetallic compound.
【０００２】この発明に係るＴｉＡｌ基金属間化合物
は、航空機、宇宙往還機、自動車その他において高い比
強度、および耐磨耗性または耐熱性が要求される部材、
たとえばタービンブレード、エンジンバルブなどに用い
られる。[0002] The TiAl-based intermetallic compound according to the present invention can be used for members requiring high specific strength, abrasion resistance or heat resistance in aircraft, space vehicles, automobiles and the like.
For example, it is used for turbine blades, engine valves and the like.
【０００３】[0003]
【従来の技術】高速で運動する部材、たとえばタービン
ブレードやエンジンバルブに用いられる材料は、耐熱性
および比強度が高いことが望ましい。耐熱性および比強
度が高ければ、高温で使用されるこれら部材は軽量とな
り、タービンやエンジンなどの熱効率は向上する。チタ
ンアルミナイドは高い比強度と耐熱性をもっているた
め、これら部材の材料として注目されている。しかし、
室温、高温での変形能の欠如、難切削性が材料製造プロ
セス上の問題となっている。2. Description of the Related Art Materials used for high-speed moving members such as turbine blades and engine valves desirably have high heat resistance and high specific strength. If the heat resistance and the specific strength are high, these members used at a high temperature become lightweight, and the thermal efficiency of a turbine, an engine, and the like is improved. Titanium aluminide has attracted attention as a material for these members because of its high specific strength and heat resistance. But,
Lack of deformability at room temperature and high temperature, and difficult cutting properties are problems in the material manufacturing process.
【０００４】従来、ＴｉＡｌ基金属間化合物の熱間加工
法として特開昭６３−１７１８６２号公報に開示されて
いる恒温鍛造法が知られている。この方法は試料だけで
なく加工用ダイスも８００〜１１００℃の高温に保持し
た後、比較的遅い歪速度で加工することにより割れを防
止する方法である。また、特開平２−２２４８０３号公
報では、真空（１０-2Torr以下）または不活性ガス雰囲
気下で温度９００〜１１５０℃、１０-2〜１０-4 S-1の
低歪速度の条件下で行う恒温圧延法を利用した熱間加工
法が開示されている。いずれの加工法においても高温で
かつ一定温度で加工を行うので、ダイスや圧延ロールの
高温保持、素材の酸化防止、および素材とダイスや圧延
ロールとの反応防止が必要となる。それに付随して雰囲
気制御、温度コントロールのための設備を必要とするの
で、加工装置全体が大型になっていた。Conventionally, as a hot working method of a TiAl-based intermetallic compound, there has been known a constant temperature forging method disclosed in Japanese Patent Application Laid-Open No. 63-171862. In this method, not only the sample but also the processing die are maintained at a high temperature of 800 to 1100 ° C., and then processed at a relatively low strain rate to prevent cracking. In Japanese Patent Application Laid-Open No. 224803/1990, a temperature of 900 to 1150 ° C. and a low strain rate of 10 −2 to 10 −4 S −1 in a vacuum (10 −2 Torr or less) or an inert gas atmosphere is used. A hot working method using a constant temperature rolling method is disclosed. In any of the processing methods, since the processing is performed at a high temperature and a constant temperature, it is necessary to maintain the die and the rolling roll at a high temperature, to prevent the material from being oxidized, and to prevent the reaction between the material and the die and the rolling roll. Accompanying this, equipment for controlling the atmosphere and temperature is required, so that the entire processing apparatus is large.
【０００５】上記問題点を解消する発明として特開昭６
１−２１３３６１号公報に素材の周囲を被覆するシース
を用いて熱間加工を行う方法が開示されている。この方
法ではＮｉ系、Ｃｏ系あるいはＦｅ−Ｎｉ系の耐熱合金
をシースとして用い、１０００℃以上で加工を行った結
果、加工率５０％程度まで素材は酸化されることなく成
形されている。特開平３−１９７６３０号公報は、シー
ス材としてＴｉＡｌの変形抵抗に近いＴｉ合金を用いた
熱間加工法を開示している。シース材をＴｉ合金にした
結果、ＴｉＡｌの熱間加工を割れなく前述のシースでは
加工できなかった６０％の加工率まで成形が可能になっ
ている。さらに、特開平８−２３８５０３号公報では、
ＴｉＡｌ基金属間化合物を鋼のシースで被覆し、９００
℃以上、かつ固相線温度以下の温度域、および５０ s-1
より遅い歪速度で熱間加工するＴｉＡｌ基金属間化合物
の熱間加工法が開示されている。同公報での熱間加工
は、熱間圧延となっている。As an invention for solving the above problems, Japanese Patent Application Laid-Open No.
Japanese Patent Application Laid-Open No. 1-213361 discloses a method of performing hot working using a sheath that covers the periphery of a material. In this method, a Ni-based, Co-based or Fe-Ni-based heat-resistant alloy is used as a sheath, and is processed at 1000 ° C. or higher. As a result, the material is formed without being oxidized up to a processing rate of about 50%. Japanese Patent Application Laid-Open No. 3-197630 discloses a hot working method using a Ti alloy having a deformation resistance close to that of TiAl as a sheath material. As a result of using a Ti alloy for the sheath material, hot working of TiAl can be performed without cracking to a working rate of 60%, which cannot be achieved with the above-described sheath. Further, in Japanese Patent Application Laid-Open No. 8-238503,
Coating a TiAl-based intermetallic compound with a steel sheath,
℃ and below the solidus temperature, and 50 s -1
A hot working method of a TiAl-based intermetallic compound that is hot worked at a lower strain rate is disclosed. The hot working in the publication is hot rolling.
【０００６】[0006]
【発明が解決しようとする課題】上記特開平８−２３８
５０３号公報の熱間加工法は、シースで被覆したＴｉＡ
ｌ基金属間化合物を、９００℃以上の温度で熱間圧延す
る。したがって、圧延温度、圧下率、または圧延速度に
よっては、圧延中にＴｉＡｌ基金属間化合物に割れや表
面しわなどの形状不良が発生することがある。また、圧
延であるために加工品の形状は棒、管、板、形材など長
尺かつ簡単な形状に限られる。さらに、熱間圧延では、
シースにＴｉＡｌを封入する際、シース開口部をシール
溶接する必要がある。したがって、生産能率が低い。SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 8-238 is disclosed.
No. 503 discloses a hot working method in which a TiA coated with a sheath is used.
The l-base intermetallic compound is hot-rolled at a temperature of 900 ° C or higher. Therefore, depending on the rolling temperature, rolling reduction, or rolling speed, shape defects such as cracks and surface wrinkles may occur in the TiAl-based intermetallic compound during rolling. In addition, because of the rolling, the shape of the processed product is limited to a long and simple shape such as a rod, a tube, a plate, and a shaped material. Furthermore, in hot rolling,
When sealing TiAl in the sheath, it is necessary to seal-weld the sheath opening. Therefore, the production efficiency is low.
【０００７】この発明は、複雑な形状の加工品を、割れ
などの欠陥が発生することなく高い生産能率で得ること
ができるＴｉＡｌ基金属間化合物の熱間加工法を提供す
ることを目的とする。An object of the present invention is to provide a hot working method of a TiAl-based intermetallic compound which can obtain a processed product having a complicated shape at a high production efficiency without generating defects such as cracks. .
【０００８】[0008]
【課題を解決するための手段】この発明のＴｉＡｌ基金
属間化合物の熱間加工法は、ＴｉＡｌ基金属間化合物を
シースで被覆し、１０００℃以上、かつ１０-1〜５０ s
-1の歪速度で熱間鍛造することを特徴としている。According to the hot working method for a TiAl-based intermetallic compound of the present invention, a TiAl-based intermetallic compound is covered with a sheath, the temperature is 1000 ° C. or more and 10 −1 to 50 s.
It is characterized by hot forging at a strain rate of -1 .
【０００９】鍛造条件は、ＴｉＡｌの高温変形特性で一
義的に決まる。鍛造時の温度を１０００℃以上としたの
は、それより低温ではＴｉＡｌの変形能が著しく低下
し、ＴｉＡｌ基金属間化合物に割れが発生するおそれが
あるためである。鍛造温度が固相線温度を超えると、液
相が現れて鍛造ができなくなるので、鍛造温度の上限は
固相線温度である。歪速度が１０-1 s-1未満であると、
加工時間が長くなり、材料および金型などの加工具の温
度が低下して割れが発生しやすくなり、また生産能率が
低下する。逆に、歪速度が５０ s-1を超えると、加工速
度が高くなり割れが発生しやすく、健全な成形体を作製
することができない。[0009] The forging conditions are uniquely determined by the high temperature deformation characteristics of TiAl. The temperature during the forging is set to 1000 ° C. or higher because, at lower temperatures, the deformability of TiAl is remarkably reduced, and cracks may occur in the TiAl-based intermetallic compound. If the forging temperature exceeds the solidus temperature, a liquid phase appears and forging cannot be performed, so the upper limit of the forging temperature is the solidus temperature. When the strain rate is less than 10 −1 s −1 ,
The processing time is prolonged, the temperature of the material and the processing tool such as a mold is lowered, cracks are easily generated, and the production efficiency is lowered. Conversely, if the strain rate exceeds 50 s −1 , the processing speed increases and cracks are likely to occur, and a sound molded body cannot be produced.
【００１０】この発明によれば、材料の割れなどの欠陥
を発生させることなく、ＴｉＡｌ基金属間化合物を熱間
加工することができる。金型などの加工具を用いること
により、複雑な形状の加工品を高い生産性で得ることが
できる。According to the present invention, a TiAl-based intermetallic compound can be hot-worked without generating defects such as cracks in the material. By using a processing tool such as a mold, a processed product having a complicated shape can be obtained with high productivity.
【００１１】上記ＴｉＡｌ基金属間化合物の熱間加工法
において、この発明の一つの態様は、前記ＴｉＡｌ基金
属間化合物がＣｒを含むことである。ＴｉＡｌ基金属間
化合物はＣｒを含むことにより延性が増し、鍛造時に割
れが発生しにくくなる。In the above-mentioned hot working method for a TiAl-based intermetallic compound, one aspect of the present invention is that the TiAl-based intermetallic compound contains Cr. Since the TiAl-based intermetallic compound contains Cr, ductility is increased, and cracks are less likely to occur during forging.
【００１２】この発明の他の態様は、前記シースがＴ
ｉ、Ｔｉ合金または鋼材からなり、厚さが１ mm 以上で
ある。シースの厚さが１ mm 未満であると、ＴｉＡｌ基
金属間化合物のシースを通しての工具への伝熱量が大き
く、ＴｉＡｌ基金属間化合物の温度が低下して割れが発
生しやすくなる。In another aspect of the present invention, the sheath is T
i, made of Ti alloy or steel, and having a thickness of 1 mm or more. When the thickness of the sheath is less than 1 mm, the amount of heat transferred from the TiAl-based intermetallic compound to the tool through the sheath is large, and the temperature of the TiAl-based intermetallic compound is lowered, so that cracks are likely to occur.
【００１３】また、この発明の更に他の態様は、前記Ｔ
ｉＡｌ基金属間化合物とシースとの間に、ＴｉＡｌ基金
属間化合物との反応性が低く、熱的に安定な酸化物また
はセラミックスを挿入して熱間鍛造することである。酸
化物またはセラミックスを挿入することにより、熱間鍛
造後にシースからＴｉＡｌ基金属間化合物を容易に取り
出すことができる。Further, still another embodiment of the present invention relates to the aforementioned T
The hot forging is performed by inserting a thermally stable oxide or ceramic having low reactivity with the TiAl-based intermetallic compound between the iAl-based intermetallic compound and the sheath. By inserting an oxide or ceramics, the TiAl-based intermetallic compound can be easily taken out of the sheath after hot forging.
【００１４】[0014]
【発明の実施の形態】この発明のＴｉＡｌ基金属間化合
物の熱間加工法は、ＴｉＡｌ基金属間化合物をシースで
被覆し、１０００℃以上、かつ１０-1〜５０ s-1の歪速
度で熱間鍛造する。BEST MODE FOR CARRYING OUT THE INVENTION In the hot working method of a TiAl-based intermetallic compound of the present invention, a TiAl-based intermetallic compound is coated with a sheath, at a temperature of 1000 ° C. or more and at a strain rate of 10 -1 to 50 s -1. Hot forging.
【００１５】上記熱間加工法において、ＴｉＡｌ基金属
間化合物の化学組成は、Ｔｉ４７．５〜５５at％、Ａｌ
３８〜５１．５at％、残部不可避的不純物である。ま
た、上記化学組成に高温変形能向上効果をもった後述の
元素を加えてもよい。高歪速度、かつ高鍛造比で熱間鍛
造を行うには、ＴｉＡｌの変形抵抗を下げるために熱間
鍛造の前段として結晶粒の均一微細化のための熱間加工
を行うことが望ましい。上記熱間加工として、たとえば
９００℃以上で恒温鍛造を行う。さらに、加工特性を向
上するには、ＴｉＡｌ基金属間化合物の成分系として、
高温変形能向上に効果があるＣｒ、Ｎｂ、Ｍｏ、Ｈｆ、
Ｔａ、Ｗ、Ｖの少なくとも一つのβ相安定化元素を含む
ものにすればよい。鍛造は大気雰囲気中で行うことがで
き、自由鍛造、型鍛造のいずれであってもよい。鍛造を
複数回に分けて行ってもよく、その場合には鍛造中に材
料の温度が低下するので、途中で材料を所定の鍛造温度
に再加熱する。鍛造温度が１０００℃以上であると、割
れの発生はほとんどなくなる。鍛造温度を高く（たとえ
ば１２００℃以上）して歪速度を大きく（たとえば、１
〜５０ s-1）すると、生産性を上げることができる。１
回の加工率については３０％以上とすることが好まし
い。その理由は３０％未満では材質面において加工変形
組織が残って不均一となることと、生産性が悪くなるた
めである。In the above hot working method, the chemical composition of the TiAl-based intermetallic compound is Ti 47.5-55 at%, Al
38 to 51.5 at%, with the balance being inevitable impurities. Further, an element described below having an effect of improving high-temperature deformability may be added to the above chemical composition. In order to perform hot forging at a high strain rate and a high forging ratio, it is desirable to perform hot working for uniform refinement of crystal grains as a pre-stage of hot forging in order to reduce the deformation resistance of TiAl. As the above-mentioned hot working, for example, constant temperature forging is performed at 900 ° C. or higher. Further, in order to improve the processing characteristics, as a component system of the TiAl-based intermetallic compound,
Cr, Nb, Mo, Hf, which are effective in improving hot deformability
What is necessary is just to contain at least one beta phase stabilizing element of Ta, W and V. Forging can be performed in an air atmosphere, and may be either free forging or die forging. Forging may be performed in a plurality of times, in which case the temperature of the material decreases during forging, so that the material is reheated to a predetermined forging temperature on the way. When the forging temperature is 1000 ° C. or higher, cracks are hardly generated. The forging temperature is increased (eg, 1200 ° C. or higher) to increase the strain rate (eg, 1
５０50 s −1 ), the productivity can be increased. 1
It is preferable that the processing rate per cycle is 30% or more. The reason is that if it is less than 30%, a deformed structure remains on the surface of the material, resulting in non-uniformity and a decrease in productivity.
【００１６】ＴｉＡｌ基金属間化合物がＣｒを含む場
合、その含有量は、１〜５at％であることが望ましい。
Ｃｒの含有量が１at％未満であると、割れ防止効果が小
さくなる。また、Ｃｒの含有量が５at％を超えると、材
料費が高くなり、割れ防止効果はそれほど上昇しない。When the TiAl-based intermetallic compound contains Cr, its content is preferably 1 to 5 at%.
When the content of Cr is less than 1 at%, the effect of preventing cracking is reduced. On the other hand, if the content of Cr exceeds 5 at%, the material cost increases, and the effect of preventing cracking does not increase so much.
【００１７】シース材として、Ｔｉ、Ｔｉ合金、または
鋼が用いられる。Ｔｉ合金はＴｉ−６Ａｌ−４Ｖ、Ｔｉ
−１５Ｖ−３Ａｌ−３Ｃｒ−３Ｓｎなどであり、鋼は炭
素鋼、合金鋼、ステンレス鋼などである。シースが鋼材
である場合、鍛造する高温域で従来用いられていた耐熱
合金に比べ、変形抵抗が低いという問題点がある。すな
わち、シースと内部のＴｉＡｌが同じ温度条件ではシー
ス材の方が変形抵抗が低いためにシース材の方ばかり変
形することになる。これを解決するには内部のＴｉＡｌ
と外部のシース材の変形抵抗が等しくなるようにシース
内の温度分布を調節すればよい。シース内の温度分布
は、伝熱計算により求めることができる。伝熱計算のパ
ラメータは、シース材の比熱、密度、熱伝導率の物性
値、鍛造温度、歪速度、シースの厚み、ＴｉＡｌの厚
み、金型温度などである。それらパラメータを調整し、
シース材の変形抵抗と内部のＴｉＡｌの変形抵抗を等し
くするようにシース材内の温度分布を管理することで、
ＴｉＡｌをシースとともに成形することができる。ま
た、鋼材の種類としては熱間鍛造の環境が大気中である
ため、鋼材の中でも耐酸化性に優れるステンレス鋼を用
いることが望ましい。As the sheath material, Ti, Ti alloy, or steel is used. Ti alloy is Ti-6Al-4V, Ti
-15V-3Al-3Cr-3Sn, and the steel is carbon steel, alloy steel, stainless steel, or the like. When the sheath is a steel material, there is a problem that the deformation resistance is lower than that of a heat-resistant alloy conventionally used in a high temperature range for forging. That is, when the sheath and the inner TiAl are at the same temperature, the sheath material is deformed only because the sheath material has lower deformation resistance. To solve this, the internal TiAl
The temperature distribution in the sheath may be adjusted so that the deformation resistance of the outer sheath material becomes equal to that of the outer sheath material. The temperature distribution in the sheath can be obtained by heat transfer calculation. The parameters of the heat transfer calculation include specific heat, density, physical properties of thermal conductivity, forging temperature, strain rate, sheath thickness, TiAl thickness, and mold temperature of the sheath material. Adjust those parameters,
By managing the temperature distribution in the sheath material so that the deformation resistance of the sheath material and the deformation resistance of the TiAl inside are equal,
TiAl can be molded with the sheath. In addition, since the environment of hot forging is in the air as a type of steel, it is desirable to use stainless steel having excellent oxidation resistance among steels.
【００１８】熱間鍛造に供される素材は、板状、棒状、
またはブロック状など目的の形状に合わせた素材を用い
る。たとえば、板状の場合、板状のＴｉＡｌ基金属間化
合物の上下面にシース材を挟むだけでよい。また、棒状
の場合、棒状のＴｉＡｌ基金属間化合物を管状シース材
に挿入し、両端部の金型と当たる面と金型面との間にシ
ース材を挟む。The material to be subjected to hot forging is a plate, a rod,
Alternatively, a material suitable for a target shape such as a block shape is used. For example, in the case of a plate, it is only necessary to sandwich the sheath material between the upper and lower surfaces of the plate-shaped TiAl-based intermetallic compound. In the case of a rod shape, a rod-shaped TiAl-based intermetallic compound is inserted into a tubular sheath material, and the sheath material is sandwiched between the surfaces of the molds at both ends and the mold surface.
【００１９】熱間加工中のＴｉＡｌ基金属間化合物とシ
ースとの間の反応を防止するため、ＣａＯ、Ａｌ
2 Ｏ3 、ＺｒＯ2 などの酸化物やＢＮなどの窒化物が用
いられる。酸化物またはセラミックスを介在させるに
は、これら材料をＴｉＡｌ基金属間化合物とシースとの
間に挿入するか、またはＴｉＡｌの表面に酸化物を形成
する。これら材料はＴｉＡｌと反応しにくく、化学的に
安定であるため、熱間鍛造後にシースから容易にＴｉＡ
ｌを取り出すことができる。これら材料は、熱間鍛造後
そのまま残っていても、使用環境上ＴｉＡｌの特性を阻
害するようなことがない。Ａｌ2 Ｏ3 を用いた場合、耐
酸化特性のための保護膜としての特性を望めるので有益
である。酸化物またはセラミックスは、シースにＴｉＡ
ｌを封入する際にシート状あるいは粉末状で挿入しても
よいが、プラズマ溶射やゾルゲル法等の各種コーティン
グ技術によりＴｉＡｌの上に均一に形成しても差し支え
ない。ＴｉＡｌ自身を改質することによっても、ＴｉＡ
ｌの表面に酸化物を形成することは可能である。In order to prevent a reaction between the TiAl-based intermetallic compound and the sheath during hot working, CaO, Al
Oxides such as 2 O 3 and ZrO 2 and nitrides such as BN are used. To interpose an oxide or ceramics, these materials are inserted between the TiAl-based intermetallic compound and the sheath, or an oxide is formed on the surface of TiAl. Since these materials hardly react with TiAl and are chemically stable, TiA can be easily removed from the sheath after hot forging.
l can be taken out. Even if these materials are left as they are after hot forging, they do not impair the characteristics of TiAl in use environment. The use of Al 2 O 3 is advantageous because properties as a protective film for oxidation resistance can be expected. Oxide or ceramic is made of TiO
1 may be inserted in the form of a sheet or a powder at the time of encapsulation, but may be uniformly formed on TiAl by various coating techniques such as plasma spraying and a sol-gel method. By modifying TiAl itself, TiA
It is possible to form an oxide on the surface of l.
【００２０】[0020]
（実施例１）素材としてＡｌ３３．４重量％、Ｃｒ４．
２重量％、残部Ｔｉ、および不可避的不純物からなるＴ
ｉＡｌ基金属間化合物をプラズマアーク溶解によりイン
ゴットを鋳造し、高温変形特性を向上する目的で、温度
１２００℃、歪速度５×１０-4 s-1で恒温鍛造法により
組織制御を行った。そこから供試材として直径１８ mm
、高さ２２ mm の大きさの円柱材を切り出し、試験に
用いた。シース材としてはＴｉ合金（Ｔｉ−６Ａｌ−４
Ｖ）、およびＳＵＳ３０４を用いた。試料をパイプ状の
シースに挿入したのち、上下面を円盤状のシースで覆っ
てスポット溶接で側面のパイプと固定した。大気雰囲気
の炉で所定の温度まで加熱後、１０分保持したのち、表
１に示した条件で鍛造を行った。この時の加工率は７０
％に設定した。(Example 1) As materials, 33.4% by weight of Al, Cr4.
T consisting of 2% by weight, balance Ti and unavoidable impurities
The ingot was cast by plasma arc melting of the iAl-based intermetallic compound, and the structure was controlled by a constant temperature forging method at a temperature of 1200 ° C. and a strain rate of 5 × 10 −4 s −1 in order to improve the high-temperature deformation characteristics. From there, 18 mm in diameter as a test material
A cylindrical material having a height of 22 mm was cut out and used for the test. As a sheath material, a Ti alloy (Ti-6Al-4) is used.
V) and SUS304. After inserting the sample into the pipe-shaped sheath, the upper and lower surfaces were covered with a disk-shaped sheath and fixed to the side pipe by spot welding. After heating to a predetermined temperature in a furnace in an air atmosphere and holding for 10 minutes, forging was performed under the conditions shown in Table 1. The processing rate at this time is 70
%.
【表１】 シースから取り出したＴｉＡｌ基金属間化合物について
欠陥や割れが発生しているか否かを調べ、その結果を表
１に示す。比較例１に示したような炉の温度が９００℃
未満の低温で鍛造を行うと構造材として致命的な欠陥や
割れを含んだ不健全なものであった。また、０．１ mm
厚さのＴａ箔で包んで鍛造した場合や歪速度が０．０１
s-1の鍛造条件では、金型からの抜熱によって試料が冷
えてしまい、内部のＴｉＡｌ基金属間化合物は割れてし
まった。また、シースなしで鍛造した場合では、表面の
酸化がひどく、加工途中で破壊した。[Table 1] The TiAl-based intermetallic compound removed from the sheath was examined for defects or cracks, and the results are shown in Table 1. The temperature of the furnace as shown in Comparative Example 1 is 900 ° C.
When forging was performed at a low temperature of less than 1, the structural material was unhealthy including fatal defects and cracks. Also, 0.1 mm
When wrapped in thick Ta foil and forged, or when the strain rate is 0.01
Under the forging condition of s- 1, the sample was cooled by heat removal from the mold, and the internal TiAl-based intermetallic compound was broken. In the case of forging without a sheath, the surface was severely oxidized and broken during processing.
【００２１】（実施例２）素材としてＡｌ３１．５重量
％、Ｎｂ１１．５重量％、残部Ｔｉ、および不可避的不
純物からなるＴｉＡｌ基金属間化合物、シースを用い実
施例１と同じ条件で熱間鍛造を行った。本例では、反応
防止材としてＡｌ2 Ｏ3 のシートを用い、熱間鍛造を行
った。鍛造後、ＴｉＡｌ基金属間化合物とシースの境界
部分を切断し、ＴｉＡｌ基金属間化合物をシースから剥
離できるか否かを評価した。その結果、実施例１の条件
では、何れの鍛造条件においても切断後、容易にシース
より内部のＴｉＡｌ基金属間化合物を剥離することがで
き、しかも割れが発生せずに健全なものが得られた。得
られたＴｉＡｌ基金属間化合物についてその表面を分析
した結果、一部Ａｌ2 Ｏ3 が鍛造によって付着していた
がシースからの金属原子の拡散は検出されず、健全な鍛
造材であることが確認された。(Embodiment 2) Hot forging is performed under the same conditions as in Embodiment 1, using 31.5% by weight of Al, 11.5% by weight of Nb, the remainder Ti, and a TiAl-based intermetallic compound composed of unavoidable impurities. Was done. In this example, hot forging was performed using an Al 2 O 3 sheet as a reaction preventing material. After forging, the boundary between the TiAl-based intermetallic compound and the sheath was cut, and it was evaluated whether the TiAl-based intermetallic compound could be peeled from the sheath. As a result, under the conditions of Example 1, under any forging conditions, the TiAl-based intermetallic compound inside can be easily peeled off from the sheath after cutting, and a sound product without cracking can be obtained. Was. As a result of analyzing the surface of the obtained TiAl-based intermetallic compound, Al 2 O 3 was partially adhered by forging, but diffusion of metal atoms from the sheath was not detected, indicating that the material was a sound forged material. confirmed.
【００２２】[0022]
【発明の効果】この発明によるＴｉＡｌ基金属間化合物
の熱間加工法は、所定の温度範囲および歪速度範囲の下
で、ＴｉＡｌ基金属間化合物を熱間鍛造する。したがっ
て、ＴｉＡｌ基金属間化合物の複雑な形状の加工品を、
割れが発生することなく、高い生産能率で得ることがで
きる。According to the hot working method for a TiAl-based intermetallic compound according to the present invention, the TiAl-based intermetallic compound is hot-forged under a predetermined temperature range and a strain rate range. Therefore, a processed product having a complicated shape of the TiAl-based intermetallic compound is
It can be obtained with high production efficiency without cracking.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ // Ｃ２２Ｆ 1/00 ６５１ Ｃ２２Ｆ 1/00 ６５１Ｂ ６８３ ６８３ ６９４ ６９４Ｚ ６９４Ｂ ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification symbol FI // C22F 1/00 651 C22F 1/00 651B 683 683 694 694 694Z 694B
Claims (4)
し、１０００℃以上、かつ１０-1〜５０ s-1の歪速度で
熱間鍛造することを特徴とするＴｉＡｌ基金属間化合物
の熱間加工法。1. A hot working method of a TiAl-based intermetallic compound, comprising coating a TiAl-based intermetallic compound with a sheath and hot-forging at 1000 ° C. or higher and a strain rate of 10 -1 to 50 s -1. Processing method.
む請求項１記載のＴｉＡｌ基金属間化合物の熱間加工
法。2. The hot working method for a TiAl-based intermetallic compound according to claim 1, wherein the TiAl-based intermetallic compound contains Cr.
材からなり、厚さが１ mm 以上である請求項１または請
求項２記載のＴｉＡｌ基金属間化合物の熱間加工法。3. The hot working method for a TiAl-based intermetallic compound according to claim 1, wherein the sheath is made of Ti, Ti alloy, or steel, and has a thickness of 1 mm or more.
スとの間に、ＴｉＡｌ基金属間化合物との反応性が低
く、熱的に安定な酸化物またはセラミックスを介在させ
て熱間鍛造する請求項１、２または３記載のＴｉＡｌ基
金属間化合物の熱間加工法。4. A hot forging method in which a thermally stable oxide or ceramic having low reactivity with a TiAl-based intermetallic compound is interposed between the TiAl-based intermetallic compound and the sheath. 4. The hot working method for a TiAl-based intermetallic compound according to 1, 2, or 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31400096A JPH10156473A (en) | 1996-11-25 | 1996-11-25 | Hot working method of tial base intermetallic compound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31400096A JPH10156473A (en) | 1996-11-25 | 1996-11-25 | Hot working method of tial base intermetallic compound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10156473A true JPH10156473A (en) | 1998-06-16 |
Family
ID=18048018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31400096A Withdrawn JPH10156473A (en) | 1996-11-25 | 1996-11-25 | Hot working method of tial base intermetallic compound |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10156473A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100708615B1 (en) * | 2000-08-11 | 2007-04-18 | 두산중공업 주식회사 | Method for Manufacturing a Large Exhaust Valve Head by Closed Die Forging |
| US7618504B2 (en) | 2000-02-23 | 2009-11-17 | Mitsubishi Heavy Industries, Ltd. | TiA1 based alloy, production process therefor, and rotor blade using same |
| EP2258497A1 (en) * | 2009-06-05 | 2010-12-08 | Böhler Schmiedetechnik GmbH & Co KG | Method for hot forming a workpiece and equipment for reducing the workpiece's heat emission |
| JP2010280002A (en) * | 2009-06-05 | 2010-12-16 | Boehler Schmiedetechnik Gmbh & Co Kg | Method for manufacturing forged piece from gamma titanium-aluminum-based alloy |
| WO2020235203A1 (en) | 2019-05-23 | 2020-11-26 | 株式会社Ihi | Tial alloy production method and tial alloy |
| WO2020235202A1 (en) | 2019-05-23 | 2020-11-26 | 株式会社Ihi | Tial alloy material, production method therefor, and hot forging method for tial alloy material |
| CN113862587A (en) * | 2021-08-12 | 2021-12-31 | 衢州学院 | In-situ dual-phase dual-scale synergistically enhanced TiAl-based composite material and preparation method thereof |
| CN113913714A (en) * | 2020-07-08 | 2022-01-11 | 中南大学 | Method for refining TC18 titanium alloy beta grains by adopting stepped strain rate forging process |
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-
1996
- 1996-11-25 JP JP31400096A patent/JPH10156473A/en not_active Withdrawn
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7618504B2 (en) | 2000-02-23 | 2009-11-17 | Mitsubishi Heavy Industries, Ltd. | TiA1 based alloy, production process therefor, and rotor blade using same |
| KR100708615B1 (en) * | 2000-08-11 | 2007-04-18 | 두산중공업 주식회사 | Method for Manufacturing a Large Exhaust Valve Head by Closed Die Forging |
| US9440283B2 (en) | 2009-06-05 | 2016-09-13 | Boehler Schmiedetechnik Gmbh & Co. Kg | Method for hot shaping a workpiece and agent for reducing the heat emission |
| JP2010280003A (en) * | 2009-06-05 | 2010-12-16 | Boehler Schmiedetechnik Gmbh & Co Kg | Method for hot forming workpiece, and means for reducing heat emission of workpiece |
| JP2010280002A (en) * | 2009-06-05 | 2010-12-16 | Boehler Schmiedetechnik Gmbh & Co Kg | Method for manufacturing forged piece from gamma titanium-aluminum-based alloy |
| US8685298B2 (en) | 2009-06-05 | 2014-04-01 | Boehler Schmiedetechnik Gmbh & Co Kg | Method for hot shaping a workpiece and agent for reducing the heat emission |
| EP2258497A1 (en) * | 2009-06-05 | 2010-12-08 | Böhler Schmiedetechnik GmbH & Co KG | Method for hot forming a workpiece and equipment for reducing the workpiece's heat emission |
| WO2020235203A1 (en) | 2019-05-23 | 2020-11-26 | 株式会社Ihi | Tial alloy production method and tial alloy |
| WO2020235202A1 (en) | 2019-05-23 | 2020-11-26 | 株式会社Ihi | Tial alloy material, production method therefor, and hot forging method for tial alloy material |
| CN113913714A (en) * | 2020-07-08 | 2022-01-11 | 中南大学 | Method for refining TC18 titanium alloy beta grains by adopting stepped strain rate forging process |
| CN113913714B (en) * | 2020-07-08 | 2022-06-24 | 中南大学 | Method for refining TC18 titanium alloy beta grains by adopting stepped strain rate forging process |
| CN113862587A (en) * | 2021-08-12 | 2021-12-31 | 衢州学院 | In-situ dual-phase dual-scale synergistically enhanced TiAl-based composite material and preparation method thereof |
| CN113862587B (en) * | 2021-08-12 | 2022-09-13 | 衢州学院 | In-situ dual-phase dual-scale synergistically enhanced TiAl-based composite material and preparation method thereof |
| CN114346136A (en) * | 2021-12-27 | 2022-04-15 | 武汉理工大学 | TiAl turbine blade stress-temperature double plastic-increasing near-net forming method |
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