JP2797201B2 - Titanium or titanium alloy structural members - Google Patents
Titanium or titanium alloy structural membersInfo
- Publication number
- JP2797201B2 JP2797201B2 JP1209454A JP20945489A JP2797201B2 JP 2797201 B2 JP2797201 B2 JP 2797201B2 JP 1209454 A JP1209454 A JP 1209454A JP 20945489 A JP20945489 A JP 20945489A JP 2797201 B2 JP2797201 B2 JP 2797201B2
- Authority
- JP
- Japan
- Prior art keywords
- titanium
- stabilizing element
- surface layer
- weight
- titanium 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 A.発明の目的 （１） 産業上の利用分野 本発明はチタンまたはチタン合金製構造部材に関す
る。DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Industrial application field The present invention relates to a structural member made of titanium or a titanium alloy.
（２） 従来の技術 従来、この種構造部材として、その部材の摺動特性要
求部位を、金属組織が単一のβ相である溶製β型チタン
合金より構成したものが知られている（特開昭61−2478
06号公報参照）。(2) Conventional technology Conventionally, as this kind of structural member, a member in which a sliding property required portion of the member is formed of a molten β-type titanium alloy whose metal structure is a single β phase is known ( JP-A-61-2478
No. 06).
（３） 発明が解決しようとする課題 しかしながら、前記溶製β型チタン合金は、溶製α型
およびα＋β型チタン合金に比べて多少摺動特性が向上
するものゝ、高速、且つ高面圧下で使用される構造部材
の要求摺動特性を満たすことはできない。(3) Problems to be Solved by the Invention However, the molten β-type titanium alloy has a slightly improved sliding property as compared with the molten α-type and α + β-type titanium alloys. The required sliding characteristics of the structural member used cannot be satisfied.
本発明は前記に鑑み、金属組織を改質して、優れた強
度、摺動特性および耐剥離性を持つ表層部を備えた前記
チタンまたはチタン合金製構造部材を提供することを目
的とする。In view of the foregoing, it is an object of the present invention to provide a titanium or titanium alloy structural member having a surface layer having excellent strength, sliding characteristics, and peeling resistance by modifying a metal structure.
B.発明の構成 （１） 課題を解決するための手段 本発明に係るチタンまたはチタン合金製構造部材は、
高密度エネルギ源を用いた局所溶融合金化処理により改
質された表層部を備え、前記表層部の金属組織は、全率
固溶型β安定化元素を10重量％以上含有する第１のβ相
と、共析型β安定化元素を3.5重量％以上、40重量％以
下含有し、且つ前記第１のβ相よりも硬さの高い第２の
β相との二相を混在させて構成されることを特徴とす
る。B. Configuration of the Invention (1) Means for Solving the Problems The structural member made of titanium or titanium alloy according to the present invention comprises:
A surface layer modified by a local melting alloying process using a high-density energy source, wherein the metallographic structure of the surface layer is a first β containing at least 10% by weight of a solid solution β-stabilizing element; And a second β phase containing 3.5% by weight or more and 40% by weight or less of the eutectoid β-stabilizing element and having a higher hardness than the first β phase. It is characterized by being performed.
（２） 作用 前記局所溶融合金化処理を適用すると、溶融後自己冷
却による急速凝固作用が得られるので、表層部の金属組
織が微細で、且つ均質となり、その表層部は高い強度を
有する。また表層部は二種のβ相の混在組織となってい
て、硬さの低い第１のβ相による潤滑性と、硬さの高い
第２のβ相による耐摩耗性とが得られるので、その表層
部は優れた摺動特性を発揮する。その上、前記局所溶融
合金化処理による表層部は、母材としてのチタンまたは
チタン合金に対する密着力が強く、優秀な耐剥離性を有
する。これにより表層部は高速、且つ高面圧下での摺動
に際し、優れた耐久性を発揮する。(2) Action When the local melting alloying treatment is applied, a rapid solidification action by self-cooling after melting is obtained, so that the metal structure of the surface layer is fine and homogeneous, and the surface layer has high strength. In addition, the surface layer has a mixed structure of two types of β phases, and lubricity by the first β phase having low hardness and wear resistance by the second β phase having high hardness are obtained. The surface layer exhibits excellent sliding characteristics. In addition, the surface layer formed by the local melting alloying treatment has strong adhesion to titanium or a titanium alloy as a base material, and has excellent peel resistance. Thus, the surface layer exhibits excellent durability when sliding at high speed and under high surface pressure.
（３） 実施例 第１図はチタン合金製構造部材としてのロッカアーム
１を示す。ロッカアーム１は内燃機関用動弁機構に用い
られるもので、その一端部にカムと摺擦するスリッパ面
２を有する。(3) Embodiment FIG. 1 shows a rocker arm 1 as a titanium alloy structural member. The rocker arm 1 is used in a valve train for an internal combustion engine, and has a slipper surface 2 at one end thereof for sliding against a cam.
ロッカアーム１の製造に当っては、Ti−6Al−4Vの組
成を有するα＋β型チタン合金製素材が用いられ、スリ
ッパ面２を構成する表層部３は、素材に高密度エネルギ
源を用いた局所溶融合金化処理を施して改質されたもの
である。In manufacturing the rocker arm 1, an α + β type titanium alloy material having a composition of Ti-6Al-4V is used, and the surface layer portion 3 constituting the slipper surface 2 is locally melted using a high-density energy source as the material. It has been modified by alloying.
表層部３の金属組織は、全率固溶型β安定化元素を含
有する第１のβ相と、共析型β安定化元素を含有する第
２のβ相との二相を混在させて構成される。The metal structure of the surface layer portion 3 is formed by mixing two phases of a first β phase containing an all-solid-type β-stabilizing element and a second β phase containing an eutectoid-type β-stabilizing element. Be composed.
全率固溶型β安定化元素としては、MoおよびＶの少な
くとも一種が該当する。また共析型β安定化元素として
は、Fe、Cr、Mn、CoおよびNiから選択される少なくとも
一種が該当する。At least one of Mo and V corresponds to the total solid-solution β-stabilizing element. The eutectoid β-stabilizing element corresponds to at least one selected from Fe, Cr, Mn, Co and Ni.
全率固溶型β安定化元素は、母材である前記α＋β型
チタン合金と全率固溶体をつくる。この元素を10重量％
以上含有させることによって、第１のβ相を室温まで持
ちきたすことができる。また、この元素は第１のβ相の
摺動特性および耐熱性を向上させる効果を有する。The all-solid-solution β-stabilizing element forms an all-solid solution with the α + β-type titanium alloy as the base material. 10% by weight of this element
With the above content, the first β phase can be brought to room temperature. Further, this element has an effect of improving the sliding characteristics and heat resistance of the first β phase.
これらの効果を得るためのMoおよびＶの具体的含有量
はMoの場合は10重量％以上、またＶの場合は14.9重量％
である。The specific contents of Mo and V for obtaining these effects are 10% by weight or more for Mo and 14.9% by weight for V.
It is.
たゞし、全率固溶型β安定化元素の単独添加では、第
１のβ相の硬さが低く、十分な耐摩耗性が得られない。However, if only the solid solution type β-stabilizing element is added alone, the hardness of the first β phase is low, and sufficient wear resistance cannot be obtained.
また共析型β安定化元素を3.5重量％以上含有させる
ことによって、第２のβ相の安定化が図られ、また析出
硬化作用を生じさせて第２のβ相の硬さを向上させるこ
とができる。By containing 3.5% by weight or more of the eutectoid β-stabilizing element, the second β phase can be stabilized, and a precipitation hardening effect can be produced to improve the hardness of the second β phase. Can be.
これらの効果を得るためのFe、Cr、Mn、CoおよびNiの
具体的含有量は、Feの場合は3.5重量％以上、Crの場合
は6.3重量％以上、Mnの場合は6.4重量％以上、Coの場合
は７重量％以上、Niの場合は９重量％以上である。The specific contents of Fe, Cr, Mn, Co and Ni for obtaining these effects are 3.5% by weight or more for Fe, 6.3% by weight or more for Cr, 6.4% by weight or more for Mn, In the case of Co, the content is 7% by weight or more, and in the case of Ni, the content is 9% by weight or more.
たゞし、共析型β安定化元素の含有量が40重量％を上
回ると、この元素の固溶性が低いことに起因して、偏析
等を生じ、安定した第２のβ相が得られなくなる。した
がって、この元素の含有量の上限は40重量％に設定され
る。However, when the content of the eutectoid β-stabilizing element exceeds 40% by weight, segregation occurs due to the low solid solubility of this element, and a stable second β phase is obtained. Disappears. Therefore, the upper limit of the content of this element is set to 40% by weight.
なお、全率固溶型β安定化元素を添加せずに、共析型
β安定化元素のみを添加すると、前記析出硬化作用に伴
い金属間化合物が形成されて第２のβ相が脆化する傾向
にあるが、この問題は全率固溶型β安定化元素を併用す
ることによって解消される。If only the eutectoid β-stabilizing element is added without adding the solid solution β-stabilizing element, an intermetallic compound is formed due to the precipitation hardening action, and the second β phase becomes brittle. However, this problem can be solved by using a solid solution type β-stabilizing element in combination.
表層部３の耐摩耗性を向上させる上で、その表層部３
に硬質粒子を分散させることは有効な手段である。この
硬質粒子の分散に当っては、全率固溶型β安定化元素を
含むMo2C粉末を用い、局所溶融合金化処理におけるMo2C
→2Mo＋Ｃ、Ti＋Ｃ→TiCの反応を利用して硬質粒子とし
てのTiCを析出させるとよい。このMoC粉末はMoとTiとの
合金化を容易にする作用をも有する。In order to improve the wear resistance of the surface layer 3,
It is an effective means to disperse the hard particles in the resin. In dispersing the hard particles, Mo 2 C powder containing all-solution β-stabilizing element is used, and Mo 2 C in local melting alloying treatment is used.
It is preferable to precipitate TiC as hard particles by utilizing the reaction of → 2Mo + C, Ti + C → TiC. This MoC powder also has the function of facilitating alloying of Mo and Ti.
以下、ロッカアーム１の局所溶融合金化処理について
説明する。Hereinafter, the local melting alloying treatment of the rocker arm 1 will be described.
第２図は粉末噴射による局所溶融合金化処理法を示
し、前記母材（Ti−6Al−4V）よりなるロッカアーム用
素材10を矢印方向へ移動させ、そのスリッパ面対応部20
に、オシレータ５より炭酸ガスレーザを照射し、同時に
ガス供給ノズル６よりシールドガスであるヘルウムガス
を、また粉末供給ノズル７よりMo2C粉末（全率固溶型β
安定化元素）およびFe粉末（共析型β安定化元素）をそ
れぞれ供給するものである。Figure 2 shows a localized molten alloying treatment by powder injection, the base material of the (Ti-6Al-4V) rocker arm blank 1 0 consisting moved in the arrow direction, the sliding surface corresponding section 2 0
Is irradiated with a carbon dioxide gas laser from an oscillator 5, and at the same time, a helium gas as a shielding gas is supplied from a gas supply nozzle 6, and a Mo 2 C powder (all-solid-solution β
And a Fe powder (eutectoid β-stabilizing element).
処理条件は次の通りである。 The processing conditions are as follows.
ロッカアーム用素材10の移動速度（処理速度）:300mm
/min 炭酸ガスレーザ：出力5kW、スポット径2mm、振幅5m
m、パワー密度５〜６×104W/cm2 Mo2C粉末：直径10〜44μｍ、供給量15.7g/min;Fe粉
末：純度99％以上、粒度200メッシュ以下、供給量4.6g/
min 前記処理により、第１のβ相と第２のβ相との二相を
混在させた金属組織が得られる。The moving speed of the rocker arm for the material 1 0 (processing speed): 300mm
/ min Carbon dioxide laser: output 5kW, spot diameter 2mm, amplitude 5m
m, power density 5-6 × 10 4 W / cm 2 Mo 2 C powder: diameter 10-44 μm, supply amount 15.7 g / min; Fe powder: purity 99% or more, particle size 200 mesh or less, supply amount 4.6 g / m
min By the above treatment, a metal structure in which two phases of the first β phase and the second β phase are mixed is obtained.
前記処理により得られた表層部３の平均組成は、Ti−
27.1Mo−7.9Fe−3.3Al−2.2Vである。The average composition of the surface layer portion 3 obtained by the above treatment was Ti-
27.1Mo-7.9Fe-3.3Al-2.2V.
炭酸ガスレーザといった高密度エネルギ源による局所
溶融合金化処理においては、溶融後自己冷却による急速
凝固作用が得られるので、金属組織が微細で、且つ均質
となる。In the local melting alloying process using a high-density energy source such as a carbon dioxide gas laser, a rapid solidification effect is obtained by self-cooling after melting, so that the metal structure becomes fine and homogeneous.
したがって表層部３は安定した摺動特性および強度を
有し、また母材に対する密着力も強い。Therefore, the surface layer portion 3 has stable sliding characteristics and strength, and has strong adhesion to the base material.
なお、前記局所溶融合金化処理法としては、素材10の
スリッパ面対応部20に予め粉末を設置しておく、プリプ
レイス法の適用も可能である。Incidentally, as the local melt alloying method, previously set up in advance powder sliding surface corresponding portion 2 0 of the material 1 0, it can also be applied pre-Place method.
また、本発明はチタン合金製構造部材にも適用され
る。The present invention is also applied to a titanium alloy structural member.
C.発明の効果 本発明によれば、表層部を得るための改質処理および
表層部の金属組織を前記のように特定することによっ
て、優れた強度、摺動特性および耐剥離性を持ち、高
速、且つ高面圧下での摺動において優れた耐久性を発揮
する表層部を備えたチタンまたはチタン合金製構造部材
を提供することができる。C. Effects of the Invention According to the present invention, by specifying the metallographic structure of the surface treatment and the modification treatment for obtaining the surface layer as described above, having excellent strength, sliding properties and peel resistance, It is possible to provide a structural member made of titanium or a titanium alloy having a surface portion exhibiting excellent durability in sliding under high speed and high surface pressure.
第１図はロッカアームの要部破断正面図、第２図は局所
溶融合金化処理法の説明図である。 １……ロッカアーム（構造部材）、３……表層部FIG. 1 is a fragmentary front view of a rocker arm, and FIG. 2 is an explanatory view of a local melting alloying method. 1 ... rocker arm (structural member) 3 ... surface layer
───────────────────────────────────────────────────── 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 ６８０ ６８０ (72)発明者 輪嶋 善彦 埼玉県和光市中央１丁目４番１号 株式 会社本田技術研究所内 (56)参考文献 特開 昭62−270277（ＪＰ，Ａ) 特開 昭62−56561（ＪＰ，Ａ) 特開 昭63−93875（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C22F 1/18 C22F 1/00 C22F 3/00 C23C 26/00 F01L 1/18──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI C22F 1/00 651 C22F 1/00 651B 680 680 (72) Inventor Yoshihiko Wajima 1-4-1 Chuo, Wako-shi, Saitama Stock Company (56) References JP-A-62-270277 (JP, A) JP-A-62-56561 (JP, A) JP-A-63-93875 (JP, A) (58) Fields investigated (Int .Cl. 6 , DB name) C22F 1/18 C22F 1/00 C22F 3/00 C23C 26/00 F01L 1/18
Claims (3)
処理により改質された表層部を備え、前記表層部の金属
組織は、全率固溶型β安定化元素を10重量％以上含有す
る第１のβ相と、共析型β安定化元素を3.5重量％以
上、40重量％以下含有し、且つ前記第１のβ相よりも硬
さの高い第２のβ相との二相を混在させて構成されるこ
とを特徴とするチタンまたはチタン合金製構造部材。1. A surface layer modified by local melting alloying using a high-density energy source, wherein the metallographic structure of the surface layer contains at least 10% by weight of a solid solution type β-stabilizing element. And a second β phase containing 3.5% by weight or more and 40% by weight or less of the eutectoid β stabilizing element and having a higher hardness than the first β phase. And a titanium or titanium alloy structural member.
Ｖの少なくとも一種であり、また前記共析型β安定化元
素は、Fe、Cr、Mn、CoおよびNiから選択される少なくと
も一種である、第（１）項記載のチタンまたはチタン合
金製構造部材。2. The β-stabilizing element in which the solid content is solid solution is at least one of Mo and V, and the eutectoid β-stabilizing element is selected from Fe, Cr, Mn, Co and Ni. The titanium or titanium alloy structural member according to (1), which is at least one kind.
あり、前記表層部はスリッパ面を構成している、第
（１）または第（２）項記載のチタンまたはチタン合金
製構造部材。3. The structural member made of titanium or titanium alloy according to (1) or (2), wherein said structural member is a rocker arm for an internal combustion engine, and said surface layer portion forms a slipper surface.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1209454A JP2797201B2 (en) | 1989-08-11 | 1989-08-11 | Titanium or titanium alloy structural members |
| US07/563,660 US5139585A (en) | 1989-08-07 | 1990-08-07 | Structural member made of titanium alloy having embedded beta phase of different densities and hard metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1209454A JP2797201B2 (en) | 1989-08-11 | 1989-08-11 | Titanium or titanium alloy structural members |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0372058A JPH0372058A (en) | 1991-03-27 |
| JP2797201B2 true JP2797201B2 (en) | 1998-09-17 |
Family
ID=16573143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1209454A Expired - Fee Related JP2797201B2 (en) | 1989-08-07 | 1989-08-11 | Titanium or titanium alloy structural members |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2797201B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101102486B1 (en) * | 2011-05-11 | 2012-01-05 | 강릉원주대학교산학협력단 | Assistant apparatus for measuring speed of current and measuring method for speed of current using it |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6256561A (en) * | 1985-09-06 | 1987-03-12 | Honda Motor Co Ltd | Method for hardening surface of ti or ti alloy |
| JPS62270277A (en) * | 1986-05-18 | 1987-11-24 | Daido Steel Co Ltd | Production of titanium base alloy-made wear resistant member |
| JPS6393875A (en) * | 1986-10-07 | 1988-04-25 | Mitsubishi Heavy Ind Ltd | Production of ti alloy member having superior wear resistance |
-
1989
- 1989-08-11 JP JP1209454A patent/JP2797201B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0372058A (en) | 1991-03-27 |
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