JPH04214830A - Ti alloy excellent in cold forgeability - Google Patents

Ti alloy excellent in cold forgeability

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Publication number
JPH04214830A
JPH04214830A JP3908991A JP3908991A JPH04214830A JP H04214830 A JPH04214830 A JP H04214830A JP 3908991 A JP3908991 A JP 3908991A JP 3908991 A JP3908991 A JP 3908991A JP H04214830 A JPH04214830 A JP H04214830A
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JP
Japan
Prior art keywords
alloy
deformation resistance
weight
cold
type
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.)
Granted
Application number
JP3908991A
Other languages
Japanese (ja)
Other versions
JP2936754B2 (en
Inventor
Hideto Oyama
英人 大山
Atsuyuki Miyamoto
宮本 淳之
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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Filing date
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Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Publication of JPH04214830A publication Critical patent/JPH04214830A/en
Application granted granted Critical
Publication of JP2936754B2 publication Critical patent/JP2936754B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To offer a Ti alloy maintaining strength equal to that of the conventional beta type Ti allay, improved in cold workability and ductility and excellent in cold forgeability. CONSTITUTION:This Ti allay contains, by weight, 0.5 to 18% Mo and/or Nb, 13 to 19% V, 0.5 to 6% Al, 0.5 to 6% Sn and the balance Ti with inevitable impurities. The offer of the Ti allay having deformation resistance lower than that of the existing beta type Ti alloy and executable of upset forging to 80% is permitted.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は、冷間鍛造性に優れたT
i合金に関し、詳細には従来のβ型Ti合金と同程度の
強度を維持しつつ、冷間加工性及び延性を向上させたT
i合金に関するものである。
[Industrial Application Field] The present invention provides T
Regarding the i alloy, in detail, it is a T alloy with improved cold workability and ductility while maintaining the same strength as the conventional β-type Ti alloy.
This relates to i-alloy.

【0002】0002

【従来の技術】Ti合金は添加元素の種類や量によって
組織がかわり、α型,α+β型,β型等に分類され、各
々個有の特性を示すことが知られている。これまでのT
i合金としてはα+β型Ti合金であるTi−6Al−
4Vが最も多く利用されており、航空機や宇宙開発機器
を中心として需要が拡大しつつある。最近では上記Ti
合金の、軽く,強く、しかも耐食性に優れるという特性
に着目して、自動車や家庭用電化製品等をはじめとする
量産型民生品の部品として使用することも検討されはじ
めている。量産に適した部品としては冷間鍛造が効率良
く行なえることが要求され、この為には変形抵抗が小さ
く延性が大きいことが必要である。しかしながら前記α
+β型Ti合金であるTi−6Al−4Vは冷間加工性
に乏しく量産用の素材としては不適当である。
BACKGROUND OF THE INVENTION It is known that the structure of Ti alloys changes depending on the type and amount of added elements, and is classified into α-type, α+β-type, β-type, etc., each of which exhibits unique characteristics. T so far
The i alloy is Ti-6Al- which is an α+β type Ti alloy.
4V is the most commonly used type, and demand is increasing mainly for aircraft and space development equipment. Recently, the above Ti
Focusing on the characteristics of alloys, which are light, strong, and excellent in corrosion resistance, consideration has begun to be given to using them as parts for mass-produced consumer products such as automobiles and home appliances. Parts suitable for mass production must be able to be cold-forged efficiently, and for this purpose, they must have low deformation resistance and high ductility. However, the α
Ti-6Al-4V, which is a +β type Ti alloy, has poor cold workability and is unsuitable as a material for mass production.

【0003】冷間加工に適したTi合金としてはβ型T
i合金が有力視されており、応力誘起マルテンサイト変
態を生じるTi−16V−4Snや変形が双晶で起こる
Ti−16V−10Sn等が既に開発されている。本発
明者らが上記2種類のβ型Ti合金について変形抵抗を
比較調査したところ、Ti−16V−4Snでは0.2
 %耐力が30kgf/mm2程度、引張強さが50k
gf/mm2程度であるのに対して、Ti−16V−1
0Snの0.2 %耐力と引張強さは共に60kgf/
mm2程度にも及び、Ti−16V−4Snの方が変形
抵抗の面で優れていることを確認している。
[0003] β-type T is a Ti alloy suitable for cold working.
The i-alloy is considered to be a promising material, and Ti-16V-4Sn, which undergoes stress-induced martensitic transformation, and Ti-16V-10Sn, which undergoes deformation in the form of twin crystals, have already been developed. When the present inventors compared and investigated the deformation resistance of the above two types of β-type Ti alloys, it was found that Ti-16V-4Sn has a resistance of 0.2
% proof stress is about 30kgf/mm2, tensile strength is 50k
gf/mm2, while Ti-16V-1
The 0.2% yield strength and tensile strength of 0Sn are both 60kgf/
It has been confirmed that Ti-16V-4Sn is superior in terms of deformation resistance.

【0004】但し、該Ti−16V−4Snは据込み限
界においては既存のβ型Ti合金であるTi−15V−
3Cr−3Sn−3Al等に劣り、またAlを含有して
いないため耐酸化性に不安が残ると共に、時効処理時に
析出するα相が軟らかくて高強度が得られず、かと言っ
てAlを添加すると冷間鍛造性が極端に低下するという
問題を有している。
However, at the upsetting limit, the Ti-16V-4Sn is inferior to the existing β-type Ti alloy Ti-15V-4Sn.
It is inferior to 3Cr-3Sn-3Al, etc., and since it does not contain Al, there are concerns about oxidation resistance, and the alpha phase that precipitates during aging treatment is soft, making it difficult to obtain high strength. There is a problem that cold forgeability is extremely reduced.

【0005】ところで本発明者らは冷間鍛造性に優れた
Ti合金を開発すべく研究を重ねてきており、これまで
にも冷間鍛造に適した強度と延性を有するTi合金を発
明して先に出願を行なった(特開平1−129941)
By the way, the present inventors have been conducting research to develop a Ti alloy with excellent cold forging properties, and have so far invented a Ti alloy that has strength and ductility suitable for cold forging. The application was filed first (Japanese Patent Application Laid-open No. 1-129941)
.

【0006】しかしながら上記先願合金で据込み鍛造を
行ない、既存のβ型Ti合金であるTi−15V−3C
r−3Sn−3Alと冷間鍛造性を比較したところ、変
形抵抗の面では優れているが、据込み限界の点ではTi
−15V−3Cr−3Sn−3Alが80%の圧縮率を
有するのに対して、上記先願合金は75%と幾分低い圧
縮率を示している。そこでさらに冷間鍛造性の優れたT
i合金を開発することが要望されている。
However, upsetting forging was performed using the above-mentioned prior alloy, and Ti-15V-3C, which is an existing β-type Ti alloy, was used.
When comparing cold forgeability with r-3Sn-3Al, it is superior in terms of deformation resistance, but Ti is superior in terms of upsetting limit.
While -15V-3Cr-3Sn-3Al has a compressibility of 80%, the prior application alloy has a somewhat lower compressibility of 75%. Therefore, T with even better cold forging properties
There is a desire to develop i-alloys.

【0007】[0007]

【発明が解決しようとする課題】本発明は上記事情に着
目してなされたものであって、既存のβ型Ti合金であ
るTi−15V−3Cr−3Sn−3Alと同程度の据
込み限界を有すると共に変形抵抗がTi−16V−4S
nと同程度若しくはそれ以上に低い冷間鍛造性に優れた
Ti合金を提供することを目的とするものである。
[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances, and it is an object of the present invention to achieve an upsetting limit comparable to that of Ti-15V-3Cr-3Sn-3Al, which is an existing β-type Ti alloy. Ti-16V-4S with deformation resistance
The object of the present invention is to provide a Ti alloy with excellent cold forgeability that is as low as or lower than n.

【0008】[0008]

【課題を解決するための手段】上記目的を達成した本発
明とはMoおよび/またはNb:0.5 〜18重量%
,V:13〜19重量%,Al:0.5 〜6重量%,
Sn:0.5 〜6重量%を含有し、残部がTiおよび
不可避不純物からなることを要旨とするものである。
[Means for Solving the Problems] The present invention that achieves the above object is: Mo and/or Nb: 0.5 to 18% by weight
, V: 13 to 19% by weight, Al: 0.5 to 6% by weight,
The gist is that it contains Sn: 0.5 to 6% by weight, and the remainder consists of Ti and inevitable impurities.

【0009】[0009]

【作用】本発明者らは変形に伴なって応力誘起マルテン
サイト変態を示すβ型Ti合金であるTi−16V−4
Snが低い変形抵抗を示すことに着目して、これに種々
の合金元素を添加して実験を繰り返す中で、Alを適量
添加して適当な強度をもたせた上で、ある種のβ相安定
化元素を添加すれば、Al添加によるα相の安定化を抑
制し、強度及び冷間加工性が共に適切なレベルに改良さ
れることを知見して本発明に想到した。
[Operation] The present inventors have developed Ti-16V-4, a β-type Ti alloy that exhibits stress-induced martensitic transformation upon deformation.
Focusing on the fact that Sn exhibits low deformation resistance, we repeated experiments by adding various alloying elements to it, and after adding an appropriate amount of Al to give it appropriate strength, we found that a certain type of β-phase stability was achieved. The present invention was conceived based on the finding that adding a chemical element suppresses the stabilization of the α phase caused by the addition of Al, and improves both strength and cold workability to appropriate levels.

【0010】上記β相安定化元素を選択するにあたって
は、Mo,Nb,Fe,Crの中から選び、種々の添加
量を変えて実験を行なったところ、次の様な結果を得た
。即ちFe,Crは合金の据込み限界を向上させる点で
は寄与するが、変形抵抗をも上昇させてしまうのに対し
、Mo,Nbは据込み限界を向上させると同時に変形抵
抗もTi−16V−4Snより低く抑えることが可能で
あることを見い出したのである。
[0010] In selecting the β-phase stabilizing element, the element was selected from among Mo, Nb, Fe, and Cr, and experiments were conducted with various addition amounts, and the following results were obtained. That is, although Fe and Cr contribute to improving the upsetting limit of the alloy, they also increase the deformation resistance, whereas Mo and Nb improve the upsetting limit and at the same time also increase the deformation resistance. They discovered that it is possible to keep the amount lower than 4Sn.

【0011】以下本発明合金における各成分元素の添加
量の限定理由について述べる。
The reason for limiting the amount of each component element added in the alloy of the present invention will be described below.

【0012】Alは時効処理によって十分な引張強度を
得る目的で添加するが、0.5 重量%未満では時効処
理を施しても十分な引張強度が得られず、6重量%を超
えると延性及び冷間鍛造性が著しく低下するので、Al
の添加量は0.5 〜6重量%とした。
Al is added to obtain sufficient tensile strength through aging treatment, but if it is less than 0.5% by weight, sufficient tensile strength cannot be obtained even after aging treatment, and if it exceeds 6% by weight, ductility and Since cold forgeability is significantly reduced, Al
The amount added was 0.5 to 6% by weight.

【0013】MoとNbは据込み限界を向上させ、変形
抵抗を低くする目的で添加するが、0.5 重量%未満
ではその効果が見られず、18重量%を超えると変形抵
抗がかえって上昇するので、0.5 〜18重量%とし
た。尚この変形抵抗の上昇は固溶硬化によるものである
と考えられる。また本合金においてMoとNbはほぼ同
様に作用するので、両元素の添加量の合計が上記範囲内
に入っていれば、単独に用いても同時に用いても良い。
[0013] Mo and Nb are added for the purpose of improving the upsetting limit and lowering the deformation resistance, but if it is less than 0.5% by weight, no such effect is seen, and if it exceeds 18% by weight, the deformation resistance increases. Therefore, the content was set at 0.5 to 18% by weight. It is believed that this increase in deformation resistance is due to solid solution hardening. Furthermore, since Mo and Nb act in substantially the same manner in this alloy, they may be used alone or simultaneously as long as the total amount of both elements added falls within the above range.

【0014】VおよびSnの範囲を決定するにあたって
はAlおよびMoとNbを前記範囲内で添加した上で、
VおよびSnの添加量を変動させながら冷間鍛造性を評
価することによって行なった。Vは13重量%未満では
据込み限界が低く、19重量%を超えて添加すると変形
抵抗が上昇するので13〜19重量%とした。一方Sn
は0.5 重量%未満になると据え込み限界が極端に低
下し、6重量%を超えて添加すると変形抵抗が上昇する
ので0.5 〜6重量%とした。尚上記据込み限界の低
下は焼入れ時に拡散変態が進行するからであると考えら
れ、また変形抵抗の上昇は固溶硬化によるものと思われ
る。
[0014] In determining the range of V and Sn, after adding Al, Mo and Nb within the above range,
The cold forgeability was evaluated while varying the amounts of V and Sn added. If V is added in an amount less than 13% by weight, the upsetting limit is low, and if it is added in an amount exceeding 19% by weight, the deformation resistance increases. On the other hand, Sn
If it is less than 0.5% by weight, the upsetting limit will be extremely lowered, and if it is added in excess of 6% by weight, the deformation resistance will increase, so it is set at 0.5 to 6% by weight. The decrease in the upsetting limit is thought to be due to the progress of diffusion transformation during quenching, and the increase in deformation resistance is thought to be due to solid solution hardening.

【0015】[0015]

【実施例】表1及び表2に示す種々の組成を有するTi
合金をボタン溶解にて溶製し(各600g)、20mm
φになるまで1000℃で約50%の熱間鍛造を行なっ
た後、900℃で10分間保持することによって溶体化
処理を施し水冷を行なった。これより直径16mm,高
さ24mmの円柱状試験片を切り出し、端面拘束状態で
冷間における据込み鍛造を行なった。
[Example] Ti having various compositions shown in Tables 1 and 2
The alloy is melted by button melting (600g each), 20mm
After about 50% hot forging was performed at 1000°C until it reached φ, solution treatment was performed by holding at 900°C for 10 minutes and water cooling was performed. A cylindrical test piece with a diameter of 16 mm and a height of 24 mm was cut from this, and cold upsetting forging was performed with the end face restrained.

【0016】冷間鍛造性の評価は参考文献[塑性と加工
,第27巻,第304号(1986),568頁「冷間
鍛造用炭素鋼線材の変形抵抗と延性に関するデータシー
ト」]記載の手法に基づいて70%及び80%の変形抵
抗を測定すると共に、80%圧縮したときの割れ発生の
有無を観察して行なった。
[0016] The cold forgeability was evaluated according to the reference document [Plasticity and Processing, Vol. 27, No. 304 (1986), p. 568 "Data Sheet on Deformation Resistance and Ductility of Carbon Steel Wire Rods for Cold Forging"]. Based on this method, the deformation resistance at 70% and 80% was measured, and the presence or absence of cracking was observed when compressed by 80%.

【0017】また一部の合金に対しては500℃で8時
間保持する時効処理を施して引張試験を行ない、引張強
度及び伸びを測定した。結果は表1及び表2に併記する
Further, some of the alloys were subjected to an aging treatment at 500° C. for 8 hours and subjected to a tensile test, and the tensile strength and elongation were measured. The results are also listed in Tables 1 and 2.

【0018】[0018]

【表1】[Table 1]

【0019】[0019]

【表2】[Table 2]

【0020】No.1〜20は各合金成分が本発明範囲
にある実施例であり、80%の圧縮によっても割れの発
生は見られず、70%及び80%の変形抵抗も比較的低
い値を示している。No.1〜14の実施例については
時効処理後の引張性質を調べたが、引張強度は90kg
f/mm2台と適度であり、伸びも14%以上と高い。
[0020]No. Examples 1 to 20 are examples in which each alloy component is within the range of the present invention, and no cracking was observed even under 80% compression, and the deformation resistance at 70% and 80% also showed relatively low values. No. For Examples 1 to 14, the tensile properties after aging treatment were investigated, and the tensile strength was 90 kg.
The f/mm is moderate at 2 levels, and the elongation is high at over 14%.

【0021】No.21〜36は合金成分のいずれかが
本発明範囲をはずれた場合の比較例であり、下記の様に
冷間加工性若しくは時効処理後の引張強度の点で劣るこ
とがわかる。尚表1では80%の圧縮で割れが発生した
場合は変形抵抗が測定できないので空欄にしている。N
o.21,22はMo,Nbの添加量が少ない場合の比
較例であり、80%の圧縮で割れが発生しており、変形
抵抗は測定不可能になっている。
[0021]No. Nos. 21 to 36 are comparative examples in which any of the alloy components were outside the range of the present invention, and as shown below, it can be seen that they are inferior in cold workability or tensile strength after aging treatment. In Table 1, if cracking occurs at 80% compression, the deformation resistance cannot be measured, so the column is left blank. N
o. Comparative examples No. 21 and No. 22 have small amounts of Mo and Nb added, and cracks occurred at 80% compression, making it impossible to measure the deformation resistance.

【0022】No.23〜25はMo,Nbの添加量が
多過ぎる場合の比較例であり、変形抵抗が高い。No.
26,27はAlの含有量が少ない場合の比較例であり
、時効処理後の引張強さが低い。No.28,29はA
lの含有量が多い場合の比較例であり、80%の圧縮に
よって割れが発生すると共に時効処理後の伸びが7%以
下と著しく低い。No.30はSn量が少ない場合の比
較例であり、80%の圧縮によって割れが発生している
。一方No.31はSn量が多い場合の比較例であり、
70%及び80%での変形抵抗が著しく高い。No.3
2はVの添加量が少ない場合の比較例であり、80%の
圧縮によって割れが発生している。これに対してNo.
33はVの添加量が多い場合の比較例であり、70%及
び80%の変形抵抗が高い。No.34〜36はMo若
しくはNbに代わってFe若しくはCrが添加された場
合の比較例であり、いずれも変形抵抗が著しく高い。
[0022]No. Nos. 23 to 25 are comparative examples in which the amounts of Mo and Nb added are too large, and the deformation resistance is high. No.
Nos. 26 and 27 are comparative examples with a low Al content, and the tensile strength after aging treatment is low. No. 28 and 29 are A
This is a comparative example in which the content of 1 is high, and cracks occur at 80% compression, and the elongation after aging treatment is extremely low at 7% or less. No. No. 30 is a comparative example in which the amount of Sn is small, and cracks occur due to 80% compression. On the other hand, No. 31 is a comparative example when the amount of Sn is large,
The deformation resistance at 70% and 80% is significantly higher. No. 3
2 is a comparative example in which the amount of V added is small, and cracks occur due to 80% compression. On the other hand, No.
No. 33 is a comparative example in which a large amount of V is added, and the deformation resistance is high at 70% and 80%. No. Nos. 34 to 36 are comparative examples in which Fe or Cr was added instead of Mo or Nb, and all of them had extremely high deformation resistance.

【0023】[0023]

【発明の効果】本発明は以上の様に構成されているので
、既存のβ型Ti合金よりも変形抵抗が低く、しかも8
0%までの据込み鍛造が可能なTi合金を提供すること
が可能となった。
Effects of the Invention Since the present invention is constructed as described above, the deformation resistance is lower than that of existing β-type Ti alloys, and the
It has become possible to provide a Ti alloy that can be upset forged down to 0%.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】  Moおよび/またはNb:0.5 〜
18重量%,V:13〜19重量%,Al:0.5 〜
6重量%,Sn:0.5 〜6重量%を含有し、残部が
Tiおよび不可避不純物からなることを特徴とする冷間
鍛造性に優れたTi合金。
[Claim 1] Mo and/or Nb: 0.5~
18% by weight, V: 13-19% by weight, Al: 0.5-
6% by weight, Sn: 0.5 to 6% by weight, and the remainder consists of Ti and unavoidable impurities.
JP3908991A 1990-02-09 1991-02-08 Ti alloy excellent in cold forgeability Expired - Fee Related JP2936754B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2-31060 1990-02-09
JP3106090 1990-02-09

Publications (2)

Publication Number Publication Date
JPH04214830A true JPH04214830A (en) 1992-08-05
JP2936754B2 JP2936754B2 (en) 1999-08-23

Family

ID=12320934

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3908991A Expired - Fee Related JP2936754B2 (en) 1990-02-09 1991-02-08 Ti alloy excellent in cold forgeability

Country Status (1)

Country Link
JP (1) JP2936754B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013154629A1 (en) * 2012-02-15 2013-10-17 Rti International Metals, Inc. Titanium alloys
CN120095001A (en) * 2025-05-08 2025-06-06 西部超导材料科技股份有限公司 Preparation method of TC16 titanium alloy and large single weight round wire for cold heading fasteners

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013154629A1 (en) * 2012-02-15 2013-10-17 Rti International Metals, Inc. Titanium alloys
CN120095001A (en) * 2025-05-08 2025-06-06 西部超导材料科技股份有限公司 Preparation method of TC16 titanium alloy and large single weight round wire for cold heading fasteners

Also Published As

Publication number Publication date
JP2936754B2 (en) 1999-08-23

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