JPH04235232A - Production of high strength titanium alloy - Google Patents
Production of high strength titanium alloyInfo
- Publication number
- JPH04235232A JPH04235232A JP189691A JP189691A JPH04235232A JP H04235232 A JPH04235232 A JP H04235232A JP 189691 A JP189691 A JP 189691A JP 189691 A JP189691 A JP 189691A JP H04235232 A JPH04235232 A JP H04235232A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- titanium alloy
- temp
- titanium
- parts
- 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- Withdrawn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
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 13
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 5
- 239000000460 chlorine Substances 0.000 claims abstract description 5
- 238000001513 hot isostatic pressing Methods 0.000 claims abstract description 5
- 239000010936 titanium Substances 0.000 claims abstract description 4
- 238000009694 cold isostatic pressing Methods 0.000 claims abstract description 3
- 238000003825 pressing Methods 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 24
- 238000002844 melting Methods 0.000 abstract description 11
- 230000008018 melting Effects 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 abstract description 5
- 238000005204 segregation Methods 0.000 abstract description 5
- 238000007711 solidification Methods 0.000 abstract description 5
- 230000008023 solidification Effects 0.000 abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 239000011812 mixed powder Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は自動車用部品、海洋ない
し船舶用部品、および一般構造用部品等の切削加工の困
難なＴｉ合金部材の粉末冶金による製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing Ti alloy members, which are difficult to cut, such as automobile parts, marine or ship parts, and general structural parts, by powder metallurgy.
【０００２】0002
【従来の技術】自動車用エンジン部材の一つであるコネ
クティングロッドは、従来鉄鋼材料を切削加工して用い
られてきた。最近の燃費向上、軽量化、高効率化等の目
的に沿って、鉄鋼材料に代わってチタン合金材での各種
部品の開発が進んでいる。しかしながら、従来のチタン
合金部品は真空アーク溶解炉（ＶＡＲ）による溶解に始
まって、鍛造、熱間圧延、熱処理等の各工程を経た後、
機械加工を施して製造しており、高価な工程を用いるこ
と、工程が複雑なことなどから必然的に製品価格も高く
、自動車部品としての汎用が難しかった。2. Description of the Related Art Connecting rods, which are one of the engine parts for automobiles, have conventionally been used by cutting steel materials. In line with recent objectives such as improving fuel efficiency, reducing weight, and increasing efficiency, various parts are being developed using titanium alloy materials instead of steel materials. However, conventional titanium alloy parts begin with melting in a vacuum arc melting furnace (VAR), then go through various processes such as forging, hot rolling, and heat treatment.
It is manufactured through mechanical processing, which requires expensive and complicated processes, which inevitably leads to high product prices, making it difficult to use it as a general-purpose automobile part.
【０００３】Ｔｉ−６Ａｌ−４Ｖは強度延性のバランス
が良く、最も多く使用されているチタン合金であり、自
動車部品の有力な候補材料である。しかしながら近年さ
らに高強度材料が要求されつつある。この要求に応える
従来型合金として、Ｔｉ−１０Ｖ−２Ｆｅ−３Ａｌをは
じめとするｎｅａｒβ型チタン合金があるが、高強度特
性を得るためには複雑かつ精密な熱処理が必要である。
簡便な強度向上策としてはＴｉ−６Ａｌ−４ＶにＦｅを
微量添加する方法が有効である。しかしながら、従来の
溶解法ではＦｅの凝固偏析が顕著に生じてしまい、材質
が安定しないという問題点があった。Ti-6Al-4V has a good balance of strength and ductility, is the most commonly used titanium alloy, and is a promising candidate material for automobile parts. However, in recent years, even higher strength materials have been required. Conventional alloys that meet this demand include near β type titanium alloys such as Ti-10V-2Fe-3Al, but complex and precise heat treatment is required to obtain high strength properties. As a simple measure for improving strength, it is effective to add a small amount of Fe to Ti-6Al-4V. However, the conventional melting method has the problem that solidification segregation of Fe occurs significantly and the material quality is unstable.
【０００４】また、従来からのチタン合金の粉末冶金法
の１つである合金粉末法は、一旦溶解した材料を粉体化
処理して原料とするため必然的に製造価格が上昇し、凝
固偏析の問題は解決されない。そのため溶解工程を介さ
ない方法での高強度チタン合金の製造工程の開発が期待
されている。なお、チタン合金の素粉末混合法について
は特開昭６２−４８０４号公報に開示されている。In addition, the alloy powder method, which is one of the conventional powder metallurgy methods for titanium alloys, inevitably increases the manufacturing price because the melted material is pulverized and used as a raw material, and the solidification segregation problem is not resolved. Therefore, it is expected to develop a manufacturing process for high-strength titanium alloys that does not involve a melting process. Incidentally, a method for mixing raw powder of titanium alloy is disclosed in JP-A-62-4804.
【０００５】[0005]
【発明が解決しようとする課題】本発明は自動車用部品
等の使用に耐え得る高強度チタン合金の溶解法によらな
い新たな高能率の製造方法を提供ことを目的とするもの
である。SUMMARY OF THE INVENTION It is an object of the present invention to provide a new high-efficiency method for manufacturing a high-strength titanium alloy that can withstand use as automobile parts, etc., and does not rely on melting methods.
【０００６】[0006]
【課題を解決するための手段・作用】本発明の着眼点は
、本発明者等が長年にわたり研究してきた素粉末法によ
る合金製造の技術にある。すなわち本発明は、従来の溶
解に代わって所定の合金成分となるよう予め機械的に混
合してなる混合粉末を、金型プレス、冷間静水圧プレス
等で所定の形状に圧粉成形し、さらに高温下で熱処理す
ることにより、合金化と焼結とを同一工程で行うことを
骨子とするものである（これがいわゆる素粉末法である
）。さらに、本発明においては強度、延性、靱性を向上
させるため、高温静水下における圧下（熱間静水圧プレ
ス；ＨＩＰ）を行う。[Means and Effects for Solving the Problems] The focus of the present invention is on the technology of producing alloys by the raw powder method, which the present inventors have been researching for many years. That is, in the present invention, instead of conventional melting, a mixed powder that has been mechanically mixed in advance to form a predetermined alloy component is compacted into a predetermined shape using a mold press, cold isostatic press, etc. The main idea is to perform alloying and sintering in the same process by further heat treating at a high temperature (this is the so-called elementary powder method). Furthermore, in the present invention, in order to improve strength, ductility, and toughness, rolling under high temperature still water (hot isostatic pressing; HIP) is performed.
【０００７】以上の方法によれば、チタンの添加元素を
任意の重量比で容易に添加することができ、かつ溶解法
および合金粉末法では凝固偏析のために添加することが
できないか、または添加量に制限のある元素も添加が可
能となる。また以上の方法によれば、溶解、鍛造ないし
熱間圧延といった高価な工程を経ることなく、自動車用
部品等の製造が可能となる。[0007] According to the above method, it is possible to easily add additional elements of titanium in any weight ratio, and addition is not possible in the melting method and alloy powder method due to solidification segregation, or the addition of titanium is difficult. It is also possible to add elements whose amounts are limited. Further, according to the above method, it is possible to manufacture automobile parts and the like without going through expensive processes such as melting, forging, or hot rolling.
【０００８】本発明において、チタン粉末中の塩素含有
量を０．００１％（重量％、以下同じ）以下にした理由
はＨＩＰ処理により密度を１００％にするためであり、
またそれによって高強度を得るためである。Ｆｅを０．
３〜１．０％未満と限定した理由は、０．３％未満では
強化作用が生じないためであり、１．０％以上では焼結
時のＦｅの拡散が不十分となり、βフレックの原因とな
ったり、またβ相が多量に生成して機械的性質にばらつ
きが生じるためである。[0008] In the present invention, the reason why the chlorine content in the titanium powder is set to 0.001% (wt%, same hereinafter) or less is to make the density 100% by HIP treatment.
This is also to obtain high strength. Fe is 0.
The reason for limiting the content to less than 3 to 1.0% is that if it is less than 0.3%, no reinforcing effect will occur, and if it is more than 1.0%, the diffusion of Fe during sintering will be insufficient, which may cause β flex. This is because a large amount of β phase is generated, causing variations in mechanical properties.
【０００９】プレス後の密度を６０％以上にする理由は
、これ未満では健全な粉末成形体が得られないからであ
る。焼成温度を限定した理由は、１１００℃未満では合
金元素の拡散が不足し、１５００℃超では結晶粒が成長
し機械的特性を悪化させるためである。焼成時間を３０
分以上に限定した理由は、この時間未満では合金元素の
拡散が不足するためである。The reason why the density after pressing is set to 60% or more is that if it is less than this, a healthy powder compact cannot be obtained. The reason for limiting the firing temperature is that below 1100°C, diffusion of alloying elements is insufficient, and above 1500°C, crystal grains grow and deteriorate mechanical properties. Baking time: 30
The reason why the time is limited to 1 minute or longer is that if the time is shorter than this, the diffusion of the alloying elements will be insufficient.
【００１０】ＡｌとＶよりなる母合金粉末を混合原料と
して使用した理由は、Ｖ４０Ａｌ６０の予め合金化され
た安価な汎用品が存在し、ＶおよびＡｌ単独で使用した
場合の焼結時のＶの拡散不足や、Ａｌの溶出が防止でき
るからである。ＨＩＰ処理の温度を限定した理由は、β
変態温度−１５０℃未満ではＨＩＰ後の密度が１００％
にならず、β変態温度＋２５０℃超では結晶粒が成長し
強度特性を低下させるためである。[0010] The reason for using a master alloy powder consisting of Al and V as a mixed raw material is that there is a pre-alloyed inexpensive general-purpose product of V40Al60, and when V and Al are used alone, the amount of V during sintering is low. This is because insufficient diffusion and elution of Al can be prevented. The reason for limiting the temperature of HIP treatment is β
When the transformation temperature is below -150℃, the density after HIP is 100%.
This is because, if the β-transformation temperature exceeds +250° C., crystal grains will grow and the strength properties will deteriorate.
【００１１】[0011]
【実施例】３種類の粉末、すなわち、その組成が純度９
９％以上で、かつ塩素含有量が０．０００８％のチタン
粉末と、その組成がアルミニウム６０％、バナジウム４
０％の添加用母合金粉末、および鉄粉末とを用意した。
次に、チタン粉末、添加用母合金粉末、および鉄粉末を
表１に示した混合比で機械的に混合した。比較のためチ
タン粉末と添加用母合金粉末を混合したものを従来法原
料粉末として使用した。混合粉末を所定の形状の弾力性
のある型に装入、充填した。充填された粉末を冷間静水
圧プレスにより圧粉成形した。成形後の密度はいずれも
８５％であった。圧粉体を、真空度１０−４〜１０−６
ｔｏｒｒ、１３００℃で２時間焼結処理した。次いで９
００℃、１０００ｋｇｆ／ｃｍ２ で２時間の熱間静水
圧プレス処理をした。[Example] Three types of powder, i.e., the composition is purity 9
Titanium powder with a chlorine content of 9% or more and a chlorine content of 0.0008%, and its composition is 60% aluminum and 4% vanadium.
A 0% additive master alloy powder and iron powder were prepared. Next, titanium powder, additive master alloy powder, and iron powder were mechanically mixed at the mixing ratio shown in Table 1. For comparison, a mixture of titanium powder and additive master alloy powder was used as the conventional raw material powder. The mixed powder was charged and filled into an elastic mold having a predetermined shape. The filled powder was compacted by cold isostatic pressing. The density after molding was 85% in all cases. The green compact is placed under a vacuum degree of 10-4 to 10-6.
sintering at 1300° C. for 2 hours. then 9
Hot isostatic pressing was performed at 00°C and 1000 kgf/cm2 for 2 hours.
【００１２】0012
【表１】[Table 1]
【００１３】従来法および本発明の方法で作った合金に
ついてそれぞれＦｅ濃度、β変態温度、引張特性を表２
に示した。Table 2 shows the Fe concentration, β transformation temperature, and tensile properties of the alloys made by the conventional method and the method of the present invention.
It was shown to.
【００１４】[0014]
【表２】[Table 2]
【００１５】表２から明らかなように本発明の方法で作
った合金は、従来材に比べ強度が高く、かつ延性が変化
しないものとなる。As is clear from Table 2, the alloy made by the method of the present invention has higher strength than conventional materials and has no change in ductility.
【００１６】[0016]
【発明の効果】以上の説明から明らかなように、本発明
では冷間で成形した混合粉末を高温下で真空焼結を行い
、熱間静水圧プレス処理を加えることにより、自動車用
部品等の使用に耐え得る高強度チタン合金（例えば、従
来の溶解法においては凝固偏析のために製造できない成
分系のチタン合金）を、溶解法によらない新たな製造法
により得ることができる。[Effects of the Invention] As is clear from the above explanation, in the present invention, cold-molded mixed powder is vacuum sintered at high temperature, and hot isostatic pressing is applied to produce automotive parts, etc. A high-strength titanium alloy that can withstand use (for example, a titanium alloy whose components cannot be manufactured by conventional melting methods due to solidification segregation) can be obtained by a new manufacturing method that does not rely on melting methods.
Claims (1)
下のチタン粉末、ＡｌとＶよりなる母合金粉末、および
Ｆｅ粉末よりなる粉末を、重量％でＡｌ５．５〜６．５
％、Ｖ３．５〜４．５％、Ｆｅ０．３〜１．０％未満、
残部Ｔｉとなるように混合し、室温にてプレスまたは冷
間静水圧プレス（ＣＩＰ）で密度６０％以上に成形した
後、１１００℃以上１５００℃以下の温度で３０分以上
の焼成を行い、焼成後さらにβ変態温度−１５０℃から
β変態温度＋２５０℃の温度で熱間静水圧プレス（ＨＩ
Ｐ）処理を施すことを特徴とする高強度チタン合金の製
造方法。1. Titanium powder with a chlorine content of 0.001% or less by weight, a master alloy powder consisting of Al and V, and a powder consisting of Fe powder, with an Al content of 5.5 to 6.5% by weight.
%, V3.5-4.5%, Fe0.3-1.0%,
After mixing so that the remainder is Ti and forming it to a density of 60% or more by pressing or cold isostatic pressing (CIP) at room temperature, baking is performed at a temperature of 1100°C or more and 1500°C or less for 30 minutes or more. After that, hot isostatic pressing (HI
P) A method for producing a high-strength titanium alloy, which is characterized by subjecting it to a treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP189691A JPH04235232A (en) | 1991-01-11 | 1991-01-11 | Production of high strength titanium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP189691A JPH04235232A (en) | 1991-01-11 | 1991-01-11 | Production of high strength titanium alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04235232A true JPH04235232A (en) | 1992-08-24 |
Family
ID=11514350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP189691A Withdrawn JPH04235232A (en) | 1991-01-11 | 1991-01-11 | Production of high strength titanium alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04235232A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013080390A1 (en) * | 2011-11-29 | 2013-06-06 | 東邦チタニウム株式会社 | α+β OR β TITANIUM ALLOY AND METHOD FOR PRODUCING SAME |
| JP2014513197A (en) * | 2010-09-27 | 2014-05-29 | パブリックストックカンパニー “ヴイエスエムピーオー アヴィスマ コーポレーション” | (4.0-6.0)% Al- (4.5-6.0)% Mo- (4.5-6.0)% V- (2.0-3.6)% Method for melting near β-type titanium alloy comprising Cr- (0.2-0.5)% Fe- (0.1-2.0)% Zr |
| CN105834431A (en) * | 2016-04-11 | 2016-08-10 | 西安欧中材料科技有限公司 | Preparation method of high-uniformity Ti-6Al-4V alloy powder metallurgic block |
-
1991
- 1991-01-11 JP JP189691A patent/JPH04235232A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014513197A (en) * | 2010-09-27 | 2014-05-29 | パブリックストックカンパニー “ヴイエスエムピーオー アヴィスマ コーポレーション” | (4.0-6.0)% Al- (4.5-6.0)% Mo- (4.5-6.0)% V- (2.0-3.6)% Method for melting near β-type titanium alloy comprising Cr- (0.2-0.5)% Fe- (0.1-2.0)% Zr |
| WO2013080390A1 (en) * | 2011-11-29 | 2013-06-06 | 東邦チタニウム株式会社 | α+β OR β TITANIUM ALLOY AND METHOD FOR PRODUCING SAME |
| US9969004B2 (en) | 2011-11-29 | 2018-05-15 | Toho Titanium Co., Ltd. | α+β or β titanium alloy and method for producing same |
| CN105834431A (en) * | 2016-04-11 | 2016-08-10 | 西安欧中材料科技有限公司 | Preparation method of high-uniformity Ti-6Al-4V alloy powder metallurgic block |
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