JP4754415B2 - Method for producing titanium alloy - Google Patents
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- JP4754415B2 JP4754415B2 JP2006163586A JP2006163586A JP4754415B2 JP 4754415 B2 JP4754415 B2 JP 4754415B2 JP 2006163586 A JP2006163586 A JP 2006163586A JP 2006163586 A JP2006163586 A JP 2006163586A JP 4754415 B2 JP4754415 B2 JP 4754415B2
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims description 39
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 229910045601 alloy Inorganic materials 0.000 claims description 82
- 239000000956 alloy Substances 0.000 claims description 82
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 74
- 239000010936 titanium Substances 0.000 claims description 74
- 229910052719 titanium Inorganic materials 0.000 claims description 74
- 238000002844 melting Methods 0.000 claims description 68
- 230000008018 melting Effects 0.000 claims description 68
- 239000000463 material Substances 0.000 claims description 46
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 12
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical group [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 11
- 229910052758 niobium Inorganic materials 0.000 claims description 10
- 239000010955 niobium Substances 0.000 claims description 10
- 239000004484 Briquette Substances 0.000 claims description 9
- 238000010894 electron beam technology Methods 0.000 claims description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910052715 tantalum Inorganic materials 0.000 claims description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 4
- 239000002994 raw material Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 7
- 239000003870 refractory metal Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 229910020012 Nb—Ti Inorganic materials 0.000 description 3
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910001275 Niobium-titanium Inorganic materials 0.000 description 1
- 229910001295 No alloy Inorganic materials 0.000 description 1
- 229910000756 V alloy Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- NMJKIRUDPFBRHW-UHFFFAOYSA-N titanium Chemical compound [Ti].[Ti] NMJKIRUDPFBRHW-UHFFFAOYSA-N 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Description
本発明は、チタン合金の製造方法に関し、特に、チタンよりも融点の高い合金成分を有するチタン合金の製造方法に関する。 The present invention relates to a method for producing a titanium alloy, and more particularly to a method for producing a titanium alloy having an alloy component having a melting point higher than that of titanium.
従来、金属チタンの製造方法として、四塩化チタンを溶融マグネシウムで還元してスポンジチタンを得るクロール法が広く採用されている。このクロール法で製造されたスポンジチタンは純度が高いため、これを溶解して金属チタンインゴットを生成しても強度が低く、構造用材料には向かないことが知られている。このため、種々の合金元素を添加してチタン材の強度を高める工夫がなされている。 Conventionally, a crawl method in which titanium tetrachloride is reduced with molten magnesium to obtain sponge titanium is widely used as a method for producing titanium metal. It is known that the titanium sponge produced by this crawl method has high purity, so that even if it is melted to produce a metal titanium ingot, its strength is low and it is not suitable for a structural material. For this reason, the device which adds various alloy elements and raises the intensity | strength of a titanium material is made | formed.
添加される合金元素は、チタン合金インゴットへの溶解に先立って、溶解原料の段階で調整されるのが一般的である。例えば、チタン−アルミ合金では，金属アルミを配合したチタン材を溶解原料として用い、これを溶解してチタン−アルミ合金を得ている。 Generally, the alloying element to be added is adjusted at the stage of the melting raw material prior to melting in the titanium alloy ingot. For example, in a titanium-aluminum alloy, a titanium material mixed with metallic aluminum is used as a melting raw material, and this is melted to obtain a titanium-aluminum alloy.
チタン材に配合される合金元素は、その融点がチタンの融点１６７５℃に近い場合にはさほどの支障は発生しないが、両者の融点差が大きい場合には支障を生じる場合がある。例えば、前記したチタン−アルミ合金を溶製する場合には、アルミニウムの融点は６６０℃、沸点は２４６７℃であるので、金属アルミニウムを配合するとチタンの融点まで溶解する間に金属アルミニウムが揮発して目的の組成よりもアルミ濃度の低い合金しか得られないことが多い。 The alloy element blended in the titanium material does not cause much trouble when the melting point thereof is close to the melting point of titanium of 1675 ° C., but may cause trouble when the difference between the melting points of the two is large. For example, when melting the above-described titanium-aluminum alloy, the melting point of aluminum is 660 ° C. and the boiling point is 2467 ° C. Therefore, when metallic aluminum is blended, metallic aluminum volatilizes while melting to the melting point of titanium. Often only alloys with an aluminum concentration lower than the target composition are obtained.
一方、チタン材に配合される元素がチタン材の融点よりも顕著に高い場合には（以下、チタンより高い融点を有する金属を単に「高融点金属」と称する場合がある）、未溶融の高融点金属が溶け残り、溶製されたチタン合金中にいわゆる未溶融部位が検出される場合がある。このような現象を引き起こす高融点金属としては、ニオブ（融点２４６８℃）、タンタル（融点２９９６℃）、モリブデン（融点２６１０℃）等が挙げられる。 On the other hand, when the element compounded in the titanium material is significantly higher than the melting point of the titanium material (hereinafter, a metal having a melting point higher than that of titanium may be simply referred to as “high melting point metal”), In some cases, the melting point metal remains undissolved, and so-called unmelted portions are detected in the melted titanium alloy. Examples of the refractory metal that causes such a phenomenon include niobium (melting point 2468 ° C.), tantalum (melting point 2996 ° C.), molybdenum (melting point 2610 ° C.), and the like.
上記高融点金属を完全に溶解し均一なチタン合金を製造する方法として、例えば、原料段階でニオブの切粉をチタン材中に配合しこれを真空アーク溶解してニオブ−チタン合金を溶製するという技術が知られている（例えば、特許文献１参照）。 As a method for producing a uniform titanium alloy by completely melting the refractory metal, for example, niobium chips are blended in a titanium material at the raw material stage, and this is vacuum arc melted to produce a niobium-titanium alloy. Is known (for example, see Patent Document 1).
この方法によれば、ニオブが切粉の状態でチタン材中に広く分散しているので、全体的に均一にニオブを溶解させることが可能である。しかしながら、前記公報に記載されているように切粉の厚みを５ｍｍ以下に設定した場合にも、金属ニオブ片がチタン中に溶け残る場合があり改善が求められていた。 According to this method, since niobium is widely dispersed in the titanium material in the state of chips, it is possible to uniformly dissolve niobium as a whole. However, even when the thickness of the chips is set to 5 mm or less as described in the above publication, the metal niobium pieces may remain undissolved in titanium, and improvement has been demanded.
この問題に対しては、チタン材と合金元素とから構成された母合金を添加することで合金元素の溶け残りを解消するという方法が開示されている（例えば、特許文献２参照）。しかしながら、この方法では、チタンと融点の近い（約１６００℃）のバナジウム合金を使用しており、金属チタンよりも融点の高い合金成分をチタン材に添加する際には必ずしも適用することができず、また、このような方法で溶解した母合金を用いてチタン合金を溶製した場合にも、溶製されたチタン合金中に合金成分が溶け残る場合があり改善が求められていた。 In order to solve this problem, a method is disclosed in which the undissolved residue of the alloy element is eliminated by adding a mother alloy composed of a titanium material and an alloy element (see, for example, Patent Document 2). However, this method uses a vanadium alloy having a melting point close to that of titanium (about 1600 ° C.), and cannot always be applied when an alloy component having a melting point higher than that of metallic titanium is added to the titanium material. In addition, even when a titanium alloy is melted using the mother alloy melted by such a method, the alloy components may remain undissolved in the melted titanium alloy, and an improvement has been demanded.
このように、チタン材と前記チタン材に比べて融点が顕著に離れた高融点金属から構成された合金を歩留まりよく製造する方法が望まれている。 Thus, there is a demand for a method of producing an alloy composed of a refractory metal having a melting point significantly different from that of the titanium material and the titanium material with a high yield.
本発明は、上記状況に鑑みてなされたものであり、金属チタンよりも融点の高い高融点金属元素を含むチタン合金の製造方法であって、溶製されたチタン合金中の合金組成が均一なチタン合金の製造方法の提供を目的とする。 The present invention has been made in view of the above situation, and is a method for producing a titanium alloy containing a refractory metal element having a melting point higher than that of metal titanium, and the alloy composition in the melted titanium alloy is uniform. It aims at providing the manufacturing method of a titanium alloy.
上記課題につき鋭意検討してきたところ、金属チタンよりも融点の高い合金成分を有するチタン合金の製造方法において、前記合金成分を母合金の形で原料チタン材と配合し、更に前記母合金を厚みが０．１〜２．０ｍｍの切粉とすることで、合金成分材の溶け残りのない均一な組成を有するチタン合金を製造することができることを見出し、本発明を完成するに至った。 As a result of intensive studies on the above-mentioned problems, in a method for producing a titanium alloy having an alloy component having a melting point higher than that of metallic titanium, the alloy component is blended with a raw material titanium material in the form of a master alloy, and the master alloy is further reduced in thickness. It has been found that a titanium alloy having a uniform composition in which the alloy component material remains undissolved can be produced by using 0.1 to 2.0 mm of chips, and the present invention has been completed.
即ち、本発明は、金属チタンよりも融点の高い合金成分を有するチタン合金の製造方法において、上記合金成分材とチタン材とからなる母合金をあらかじめ調製し、母合金を、厚みが０．１〜２．０ｍｍの母合金切粉とし、次いで上記母合金切粉をチタン材に配合して溶製することを特徴としている。 That is, according to the present invention, in a method for producing a titanium alloy having an alloy component having a melting point higher than that of metal titanium, a master alloy composed of the alloy component material and the titanium material is prepared in advance, and the master alloy has a thickness of 0.1. It is characterized by forming a mother alloy chip of ˜2.0 mm, and then melting the mother alloy chip by blending it with a titanium material.
更には、本発明は、前記母合金の融点が金属チタンの溶製温度に等しくなるように前記母合金中の金属チタンよりも融点の高い合金成分材とチタン材との配合比を調整することを特徴とするものである。 Furthermore, the present invention adjusts the compounding ratio of the alloy component material and the titanium material having a melting point higher than that of the metal titanium in the master alloy so that the melting point of the master alloy becomes equal to the melting temperature of the metal titanium. It is characterized by .
また、本発明は、上述した母合金の切粉およびチタン材を電子ビーム溶解することを特徴とするものである。前記した母合金切粉を原料チタン材に配合して溶製することにより、母合金成分が前記原料チタン材中に溶け残ることなく、均一な組成を有するチタン合金を溶製することができるという効果を奏する。 Further, the present invention is characterized in that the above-mentioned mother alloy chips and titanium material are melted by an electron beam. By mixing and melting the above-mentioned master alloy chips in the raw material titanium material, it is possible to melt a titanium alloy having a uniform composition without the mother alloy component remaining undissolved in the raw material titanium material. There is an effect.
さらに、本発明は、合金成分を含んだ母合金をチタン材の中心部に内包した形で電極を構成して、これを溶解してチタン合金インゴットを溶製することを好ましい形態としている。この形態によっても、合金化されることで合金成分材の融点が下げられているから、金属チタンと共に溶製する際に母合金が溶け残ることが抑制され、均一なチタン合金を作製することができる。 Furthermore, in the present invention, it is preferable that an electrode is formed in a form in which a mother alloy containing an alloy component is included in the center of a titanium material, and this is melted to produce a titanium alloy ingot. Even in this form, since the melting point of the alloy component material is lowered by alloying, it is possible to prevent the mother alloy from remaining undissolved when melting together with titanium metal, and to produce a uniform titanium alloy. it can.
本発明によれば、従来の方法では溶け残りなく溶解することが難しいとされたチタン材よりも融点の高い合金成分を有するチタン合金の溶製においても前記合金の溶製に用いる母合金の融点と投入形態を工夫することで均一な組成を有するチタン合金を製造することができるという効果を奏するものである。したがって、合金成分組成を精度良く制御することができるという効果も奏するものである。 According to the present invention, the melting point of the master alloy used for melting the alloy also in the melting of the titanium alloy having an alloy component having a melting point higher than that of the titanium material, which is difficult to dissolve without being melted by the conventional method. By devising the charging form, it is possible to produce a titanium alloy having a uniform composition. Therefore, the effect that the alloy component composition can be controlled with high precision is also achieved.
以下、本発明の最良の実施形態について以下に説明する。
本発明に用いる母合金は、ニオブやタンタルあるいはモリブデンのような、金属チタンよりも融点が遥かに高い高融点金属を合金成分とするチタン合金の溶製に効果的に用いることができる。
The best mode of the present invention will be described below.
The master alloy used in the present invention can be effectively used for melting a titanium alloy containing a high melting point metal having a melting point much higher than that of metal titanium, such as niobium, tantalum or molybdenum.
本発明に係るチタン合金の溶製に用いる合金は厚みが０．１〜２．０ｍｍである母合金切粉を用いることが好ましい。また、更には、０．１〜０．５ｍｍの厚みにあるものがより好ましいとされる。前記合金成分である切粉の厚みが２．０ｍｍ以上になると、溶製後のチタン合金中に前記切粉の溶け残りが観察される場合が好ましくない。一方、前記切粉の厚みは溶け残りという観点からは薄いほど好ましいが現場の作業を考慮すると０．１ｍｍが限界であると考えている。よって、本発明に用いる合金成分の切粉の厚みは、０．１〜２ｍｍの範囲に予め調整しておくことが好ましい。 The alloy used for melting the titanium alloy according to the present invention is preferably a mother alloy chip having a thickness of 0.1 to 2.0 mm. Furthermore, the thickness of 0.1 to 0.5 mm is more preferable. When the thickness of the chip as the alloy component is 2.0 mm or more, it is not preferable that the unmelted residue of the chip is observed in the titanium alloy after melting. On the other hand, the thickness of the chip is preferably as thin as possible from the viewpoint of undissolved, but considering the work at the site, 0.1 mm is considered the limit. Therefore, it is preferable to adjust the thickness of the alloy component chips used in the present invention in the range of 0.1 to 2 mm in advance.
前記母合金切粉は、市販されている母合金インゴットをバイトで切削することにより得ることができる。切粉の厚みは、インゴットに対するバイトの食い込み深さを調節することにより調整することができる。 The mother alloy chips can be obtained by cutting a commercially available mother alloy ingot with a cutting tool. The thickness of the chips can be adjusted by adjusting the depth of bite biting into the ingot.
前記切粉を切削する際には、前記切削面をアルゴンガスのような不活性ガスで冷却しつつ行うことが好ましい。このような切削方法を行うことで、切削時に発生する摩擦熱による切削面の過熱が抑制され、その結果、大気中の酸素や窒素で汚染されていない品質の優れた切粉を製造できるという効果を奏する。 When cutting the chips, it is preferable to cool the cutting surface with an inert gas such as argon gas. By performing such a cutting method, overheating of the cutting surface due to frictional heat generated at the time of cutting is suppressed, and as a result, it is possible to produce excellent quality chips that are not contaminated with atmospheric oxygen or nitrogen Play.
切削された切粉は、溶解に先立って１０〜１００ｍｍの長さに裁断しておくことが好ましい。更には、１０〜５０ｍｍの範囲に裁断しておくことがより好ましいとされる。また、前記切粉の幅は、１〜２０ｍｍの範囲に調整しておくことが好ましい。このように切削された切粉を前記のような長さや幅に予め揃えておくことにより、原料チタン材と切粉とを均一に配合することができるという効果を奏する。 The cut chips are preferably cut into a length of 10 to 100 mm prior to dissolution. Furthermore, it is more preferable to cut into a range of 10 to 50 mm. Moreover, it is preferable to adjust the width | variety of the said chip in the range of 1-20 mm. By arranging the cut chips thus cut in advance in the length and width as described above, there is an effect that the raw material titanium material and the chips can be blended uniformly.
本発明に用いる母合金切粉の融点は、純チタンの融点よりも高い場合にも好適に用いることができ、この点が本願発明の優れた特徴である。 The melting point of the mother alloy chip used in the present invention can be suitably used even when it is higher than the melting point of pure titanium, and this is an excellent feature of the present invention.
しかしながら、前記母合金の融点を純チタンの溶製の際に形成される溶融チタンプールの温度（以下、単に「金属チタンの溶製温度」と呼ぶ場合がある。）に等しくなるように前記母合金を構成する高融点金属と金属チタンの配合比を予め調整しておくことにより、前記母合金の溶け残りを回避することができるのみならず溶製後の組織も均一にできるという効果を奏するものである。 However, the mother alloy has a melting point equal to the temperature of a molten titanium pool formed when pure titanium is melted (hereinafter sometimes simply referred to as “melting temperature of metal titanium”). By adjusting the compounding ratio of the refractory metal and metal titanium constituting the alloy in advance, it is possible to avoid not only the melting of the mother alloy but also to make the structure after melting uniform. Is.
前記溶融チタンプールの温度は、電子ビーム溶解炉では、２０００〜２５００℃付近にあると言われている。よって、高融点金属がニオブでは、母合金中の比率が３５〜６５ｗｔ％であることが好ましく、タンタルでは、１５〜４０ｗｔ％が、また、モリブデンでは、１５〜４０ｗｔ％が好ましい組成範囲である。前記したような融点を持つように母合金の切粉の融点を調整しておくことで、溶け残りがなく、また、溶製後の組織の均一な合金を製造することができるという効果を奏するものである。 The temperature of the molten titanium pool is said to be around 2000 to 2500 ° C. in the electron beam melting furnace. Therefore, when the refractory metal is niobium, the ratio in the mother alloy is preferably 35 to 65 wt%, 15 to 40 wt% is preferable for tantalum, and 15 to 40 wt% is preferable for molybdenum. By adjusting the melting point of the mother alloy chips so as to have the melting point as described above, there is an effect that there is no undissolved residue and an alloy having a uniform structure after melting can be produced. Is.
前記のように準備された母合金の切粉とチタン合金原料であるチタン材を所定量秤量後、チタン材と均一に混合させておくことが好ましい。均一に混合させた溶解原料は、プレス成型後電極を構成して真空アーク溶解炉へ供給するか、もしくは、バラの状態で電子ビーム溶解炉に供給してチタン合金インゴットを溶製することができる。 It is preferable that a predetermined amount of the mother alloy chips and titanium alloy raw material prepared as described above are weighed and then uniformly mixed with the titanium material. The uniformly mixed melting raw material can be supplied to a vacuum arc melting furnace by forming an electrode after press molding, or can be supplied to an electron beam melting furnace in a loose state to melt a titanium alloy ingot. .
前記の電極は、母材であるチタン材の中心部に母合金を内包して配置させて成形したブリケットを接合して構成することもできる。前記ブリケットの成形圧は、製造されたブリケットの見かけ密度が、２．０〜３．５ｇ／ｃｍ３の範囲となるような圧力で行うことが好ましい。 The electrode can also be constituted by joining a briquette formed by placing a mother alloy in a central portion of a titanium material which is a base material. The forming pressure of the briquette is preferably such that the apparent density of the manufactured briquette is in the range of 2.0 to 3.5 g / cm 3 .
さらには、別の形態としては、母合金の切粉とチタン材を混合してこれを加圧してコンパクトに成形し、これを電子ビーム溶解炉に供給してチタン合金インゴットを溶製することも可能である。この形態においても、切粉とチタン材が均一に混合されているので、溶製後のインゴットの組成も均一にすることができる。 Furthermore, as another form, it is also possible to mix the chip of the mother alloy and the titanium material, press this into a compact shape, and supply it to an electron beam melting furnace to melt the titanium alloy ingot. Is possible. Also in this form, since the chip and the titanium material are uniformly mixed, the composition of the ingot after melting can be made uniform.
本発明の合金製造に用いるチタン材としては、スポンジチタンが一般的であるが、特にこれに限るものではなく、純チタンのスクラップや切粉、あるいは鍛造・切断片を用いることも可能である。ただし、これらのチタン材を使用する場合であっても、できる限り母合金の粒度に揃えておくことが好ましい。 As a titanium material used for manufacturing the alloy of the present invention, sponge titanium is generally used. However, it is not particularly limited, and pure titanium scraps and chips, or forged / cut pieces can also be used. However, even when these titanium materials are used, it is preferable to make the grain size of the master alloy as uniform as possible.
チタン材がスポンジチタンである場合には、１〜２５ｍｍの範囲に整粒しておくことが好ましい。またスクラップや切粉の場合においても、出来る限り、前記の粒度範囲に調整しておくことが好ましい。 When the titanium material is sponge titanium, it is preferable to adjust the particle size in the range of 1 to 25 mm. Also in the case of scraps and chips, it is preferable to adjust the particle size range as much as possible.
さらに、これらのチタン材をブリケットあるいはコンパクトの形で用いる場合には、スポンジチタンを外周部に、スクラップや切粉は中心部に配置した形で成形しておくことが好ましい。このような内部配置とすることで型崩れのしないブリケットあるいはコンパクトを成形することができる。 Further, when these titanium materials are used in a briquette or compact form, it is preferable to form the titanium titanium in the outer peripheral portion and scrap and chips in the central portion. By adopting such an internal arrangement, a briquette or compact that does not lose its shape can be formed.
以上述べたように本発明の方法によれば、チタンの母材中に合金成分の溶け残りがなく、しかも合金組成の均一なチタン合金を溶製することができるという効果を奏するものである。 As described above, according to the method of the present invention, it is possible to produce a titanium alloy having no alloy component remaining in the titanium base material and having a uniform alloy composition.
以下、実施例および比較例によって、本発明をさらに詳細に説明する。
［実施例１］
下記に詳細を示す配合の原料（スポンジチタン、母合金および合金元素）を配合した後、ブリケットを成形し、これを溶接接合して溶解用電極とした。次いで、この溶解用電極を真空アーク溶解してチタン合金インゴットを溶製した。得られたチタン合金インゴットの平均組成は表１に示す通りである。次いで前記インゴットの内質を調査したところ表２のＮｏ．１〜Ｎｏ．４に示すように、Ｎｂ−Ｔｉ切粉の厚みが０．１ｍｍ〜２．０ｍｍのいずれの場合においても合金成分の溶け残りは見られず、また、合金成分の分布は、均一であった。
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
[Example 1]
After blending the raw materials (sponge sponge, mother alloy and alloy element) shown in detail below, a briquette was formed, and this was welded to form a melting electrode. Next, this melting electrode was melted by vacuum arc to produce a titanium alloy ingot. The average composition of the obtained titanium alloy ingot is as shown in Table 1. Next, when the quality of the ingot was examined, No. 2 in Table 2 was obtained. 1-No. As shown in FIG. 4, in any case where the thickness of the Nb—Ti chips was 0.1 mm to 2.0 mm, no undissolved alloy component was observed, and the distribution of the alloy component was uniform.
１）チタン材
品種：スポンジチタン（ＣＰグレード）、粒度：１〜２５ｍｍ
２）合金配合成分
５０％Ｎｂ−５０％Ｔｉ母合金切粉
厚み：０．１ｍｍ／０．５ｍｍ／１．０ｍｍ／２．０ｍｍ、幅５〜１０ｍｍ、長さ１０〜５０ｍｍ
３）ブリケット
大きさ：２６０ｍｍ×３２０ｍｍ×１５０ｍｍ
見かけ密度：３．０〜３．５ｇ／ｃｍ３
仕様：中心部に母合金を内包
４）溶製されたインゴット組成
1) Titanium material Variety: Sponge titanium (CP grade), Particle size: 1-25mm
2) Alloy compounding components 50% Nb-50% Ti master alloy chips Thickness: 0.1 mm / 0.5 mm / 1.0 mm / 2.0 mm, width 5-10 mm, length 10-50 mm
3) Briquette Size: 260mm x 320mm x 150mm
Apparent density: 3.0 to 3.5 g / cm 3
Specification: Including mother alloy in the center 4) Melted ingot composition
［比較例１］
合金元素であるニオブをニオブ単味で添加した以外は、実施例１と同じ条件でチタン合金を溶製した。溶製されたチタン合金インゴットの内質を調査したところ、未溶融のニオブが数箇所観察された。
[Comparative Example 1]
A titanium alloy was melted under the same conditions as in Example 1 except that niobium, which is an alloy element, was added as a simple niobium. When the internal quality of the melted titanium alloy ingot was investigated, some unmelted niobium was observed.
［比較例２］
実施例１において、Ｎｂ−Ｔｉ切粉の厚みを、２．１ｍｍ、２．５ｍｍ、３．０ｍｍおよび５．０ｍｍとした以外は同じ条件でＮｂ−Ｔｉ合金を溶製した。溶製後のインゴットの内質を調査したところ、表２のＮｏ．５〜Ｎｏ．８に示すように合金成分の溶け残りが観察された。
[Comparative Example 2]
In Example 1, the Nb-Ti alloy was melted under the same conditions except that the thickness of the Nb-Ti chips was 2.1 mm, 2.5 mm, 3.0 mm, and 5.0 mm. When the quality of the ingot after melting was investigated, No. 2 in Table 2 was obtained. 5-No. As shown in FIG. 8, the undissolved residue of the alloy component was observed.
表２から明らかなように、本発明の範囲である厚みが０．１〜２．０ｍｍの母合金切粉を使用すれば、組成が均一な高融点成分含有チタン合金を作製することができる。 As is clear from Table 2, a high melting point component-containing titanium alloy having a uniform composition can be produced by using a mother alloy chip having a thickness of 0.1 to 2.0 mm, which is the range of the present invention.
本発明によれば、チタンと融点差の大きい高融点合金元素を含有するチタン合金を効率よく製造することができ、各種構造用材料の製造において有用である。 According to the present invention, a titanium alloy containing a high melting point alloy element having a large difference in melting point from titanium can be efficiently produced, which is useful in the production of various structural materials.
Claims (6)
上記合金成分材とチタン材とからなる母合金をあらかじめ調製し、上記母合金を、厚みが０．１〜２．０ｍｍの母合金切粉とし、次いで上記母合金切粉をチタン材に配合して溶製することを特徴とするチタン合金の製造方法。 In a method for producing a titanium alloy having an alloy component having a melting point higher than that of metal titanium,
A mother alloy composed of the alloy component material and titanium material is prepared in advance, the mother alloy is made into a mother alloy chip having a thickness of 0.1 to 2.0 mm, and then the mother alloy chip is blended with the titanium material. A method for producing a titanium alloy, characterized by comprising melting and manufacturing.
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