JP2001164345A - Sintered stainless steel material for supercharger, and manufacturing method therefor - Google Patents
Sintered stainless steel material for supercharger, and manufacturing method thereforInfo
- Publication number
- JP2001164345A JP2001164345A JP34523399A JP34523399A JP2001164345A JP 2001164345 A JP2001164345 A JP 2001164345A JP 34523399 A JP34523399 A JP 34523399A JP 34523399 A JP34523399 A JP 34523399A JP 2001164345 A JP2001164345 A JP 2001164345A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- stainless steel
- supercharger
- steel material
- sintered
- 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.)
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Links
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- Supercharger (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ターボチャジャ
ー、スーパーチャジャー等の各種過給機に用いられる焼
結ステンレス鋼材料及びその製造方法に関する。さらに
は、この材料を用いた過給機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered stainless steel material used for various superchargers such as a turbocharger and a supercharger, and a method for producing the same. Furthermore, it relates to a supercharger using this material.
【０００２】[0002]
【従来技術】例えば、自動車エンジンに用いられる過給
機においては、常に排ガス等の高温にさらされる上、場
合によっては部材どうしの摩擦・摺動にも耐えなければ
ならない。このため、これらの過給機用材料には少なく
とも耐熱性・耐摩耗性が要求される。2. Description of the Related Art For example, a supercharger used in an automobile engine must be constantly exposed to high temperatures such as exhaust gas and, in some cases, withstand friction and sliding between members. Therefore, these supercharger materials are required to have at least heat resistance and wear resistance.
【０００３】一方、過給機の作製にあたって、これらの
材料はいくつかの部品を互いに溶接することによってア
ッセンブリー化される場合も多い。殊に、複雑な形状を
有する部位では、溶接により構成される部分の割合が高
くなる。このため、溶接性も、これら部材に要求される
一つの特性と言える。On the other hand, in the production of a supercharger, these materials are often assembled by welding several parts to each other. In particular, in a portion having a complicated shape, the ratio of a portion formed by welding increases. For this reason, the weldability can be said to be one characteristic required for these members.
【０００４】ところで、少なくとも耐熱性が要求される
過給機で使用される構造部材（材質）としては、一般に
ステンレン鋼材料からなるものが汎用されているが、ス
テンレン鋼材料（特に焼結材料）は溶接による接合が容
易ではない。このため、溶接性に優れたステンレス鋼材
料の開発が切望されている。By the way, as a structural member (material) used in a turbocharger requiring at least heat resistance, a member made of a stainless steel material is generally used, but a stainless steel material (particularly a sintered material) is used. Is not easy to join by welding. For this reason, development of a stainless steel material excellent in weldability has been desired.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、耐熱性
・耐摩耗性と溶接性とを兼ね備えた材料は未だ開発され
ていない。例えば、オーステナイト系ステンレス鋼材料
は高温域での使用には有効であるものの、一般に機械的
強度が低い。一方、マルテンサイト系ステンレス鋼材料
は機械的強度に優れる反面、溶接性がきわめて低いた
め、前記のような複雑なアッセンブリーの組立てには不
向きである。However, a material having both heat resistance, wear resistance and weldability has not yet been developed. For example, an austenitic stainless steel material is effective for use in a high temperature range, but generally has low mechanical strength. On the other hand, a martensitic stainless steel material is excellent in mechanical strength, but has extremely low weldability, and thus is not suitable for assembling such a complicated assembly.
【０００６】このように、今までに開発されている材料
では、過給機に要求される特性を十分に満足することが
できないというのが現状である。[0006] As described above, at present, the materials developed so far cannot sufficiently satisfy the characteristics required for the supercharger.
【０００７】従って、本発明は、かかる従来技術の問題
点に鑑みてなされたものであり、過給機用として優れた
特性を発揮できる焼結ステンレス鋼材料を提供すること
を主な目的とする。[0007] Accordingly, the present invention has been made in view of the problems of the prior art, and has as its main object to provide a sintered stainless steel material which can exhibit excellent characteristics for use in a supercharger. .
【０００８】[0008]
【課題を解決するための手段】本発明者は、上記従来技
術の問題に鑑みて鋭意研究を重ねた結果、特定の構成か
らなる焼結ステンレス鋼材料が上記目的を達成できるこ
とを見出し、本発明を完成するに至った。Means for Solving the Problems The present inventor has conducted intensive studies in view of the above-mentioned problems of the prior art, and as a result, has found that a sintered stainless steel material having a specific structure can achieve the above object. Was completed.
【０００９】すなわち、本発明は、下記の過給機用焼結
ステンレス鋼材料及びその製造方法に係るものである。That is, the present invention relates to the following sintered stainless steel material for a turbocharger and a method for producing the same.
【００１０】１．Ｃｒ：８〜２８重量％、Ｍｏ、Ｗ、Ｖ
及びＴｉの少なくとも１種：１〜１０重量％、Ｓｉ：
０．２〜５重量％、Ｃ：０．０５〜０．８重量％、Ｏ：
０．３５重量％以下であって、残部がＦｅ及び不可避元
素からなることを特徴とする過給機用焼結ステンレス鋼
材料。（第一発明） ２．Ｃｒ：８〜２８重量％、Ｍｏ、Ｗ、Ｖ及びＴｉの少
なくとも１種：１〜１０重量％、Ｃｕ：０．５〜５重量
％、Ｓｉ：０．２〜５重量％、Ｃ：０．０５〜０．８重
量％、Ｏ：０．３５重量％以下であって、残部がＦｅ及
び不可避元素からなることを特徴とする過給機用焼結ス
テンレス鋼材料。（第二発明） ３．マトリックスがマルテンサイトであり、硬質粒子と
してＣｒ、Ｍｏ、Ｗ、Ｖ及びＴｉの少なくとも１種のフ
ェロアロイが存在する上記第１項又は第２項に記載の過
給機用焼結ステンレス鋼材料。[0010] 1. Cr: 8 to 28% by weight, Mo, W, V
And at least one of Ti: 1 to 10% by weight, Si:
0.2 to 5% by weight, C: 0.05 to 0.8% by weight, O:
A sintered stainless steel material for a turbocharger, which is 0.35% by weight or less, with the balance being Fe and unavoidable elements. (First invention) Cr: 8 to 28% by weight, at least one of Mo, W, V and Ti: 1 to 10% by weight, Cu: 0.5 to 5% by weight, Si: 0.2 to 5% by weight, C: 0. A sintered stainless steel material for a turbocharger, wherein the material is 0.5 to 0.8% by weight, O: 0.35% by weight or less, with the balance being Fe and unavoidable elements. (Second invention) 3. The sintered stainless steel material for a turbocharger according to the above item 1 or 2, wherein the matrix is martensite, and at least one ferroalloy of Cr, Mo, W, V and Ti is present as hard particles.
【００１１】４．Ｃｒ、Ｍｏ、Ｗ、Ｖ及びＴｉの少なく
とも１種の供給源の一部又は全部としてフェロアロイを
用い、当該フェロアロイを含む原料粉末を成形及び焼結
することを特徴とする上記第１項〜第３項のいずれかに
記載の過給機用焼結ステンレス鋼材料の製造方法。4. The ferroalloy is used as a part or all of at least one of the sources of Cr, Mo, W, V and Ti, and a raw material powder containing the ferroalloy is molded and sintered. The method for producing a sintered stainless steel material for a turbocharger according to any one of the above items.
【００１２】５．フェロアロイが、フェロモリブデン、
フェロタングステン、フェロバナジウム、フェロチタン
及びフェロクロムの少なくとも１種である上記第４項記
載の製造方法。5. Ferroalloy, ferromolybdenum,
5. The method according to claim 4, wherein the method is at least one of ferrotungsten, ferrovanadium, ferrotitanium, and ferrochrome.
【００１３】６．上記第１項１〜第３項のいずれかに記
載の材料を少なくとも一部に用いてなる過給機。6. A supercharger comprising at least a part of the material according to any one of the above items 1 to 3.
【００１４】[0014]
【発明の実施の形態】第一発明の過給機用焼結ステンレ
ス鋼材料は、Ｃｒ：８〜２８重量％（好ましくは９〜２
３重量％、より好ましくは１０〜２０重量％）、Ｍｏ、
Ｗ、Ｖ及びＴｉの少なくとも１種：１〜１０重量％（好
ましくは２〜１０重量％、より好ましくは３〜８重量
％）、Ｓｉ：０．２〜５重量％（好ましくは０．５〜４
量％、より好ましくは０．５〜３重量％）、Ｃ：０．０
５〜０．８重量％（好ましくは０．１〜０．７重量％、
より好ましくは０．１〜０．６重量％）、Ｏ：０．３５
重量％以下（好ましくは０．３２重量％以下、より好ま
しくは０．２５重量％以下）であって、残部がＦｅ及び
不可避元素からなることを特徴とする。BEST MODE FOR CARRYING OUT THE INVENTION The sintered stainless steel material for a turbocharger according to the first invention has a Cr content of 8 to 28% by weight (preferably 9 to 2% by weight).
3% by weight, more preferably 10 to 20% by weight), Mo,
At least one of W, V and Ti: 1 to 10% by weight (preferably 2 to 10% by weight, more preferably 3 to 8% by weight), Si: 0.2 to 5% by weight (preferably 0.5 to 5% by weight) 4
%, More preferably 0.5 to 3% by weight), C: 0.0
5 to 0.8% by weight (preferably 0.1 to 0.7% by weight,
More preferably, 0.1 to 0.6% by weight), O: 0.35
% By weight (preferably 0.32% by weight or less, more preferably 0.25% by weight or less), with the balance being Fe and unavoidable elements.
【００１５】また、第二発明の過給機用焼結ステンレス
鋼材料は、Ｃｒ：８〜２８重量％（好ましくは９〜２３
重量％、より好ましくは１０〜２０重量％）、Ｍｏ、
Ｗ、Ｖ及びＴｉの少なくとも１種：１〜１０重量％（好
ましくは２〜１０重量％、より好ましくは３〜８重量
％）、Ｃｕ：０．５〜５重量％（好ましくは０．５〜４
重量％、より好ましくは０．５〜３重量％）、Ｓｉ：
０．２〜５重量％（好ましくは０．５〜４重量％、より
好ましくは０．５〜３重量％）、Ｃ：０．０５〜０．８
重量％（好ましくは０．１〜０．７重量％、より好まし
くは０．１〜０．６重量％）、Ｏ：０．３５重量％以下
（好ましくは０．３２重量％以下、より好ましくは０．
２５重量％以下）であって、残部がＦｅ及び不可避元素
からなることを特徴とする。すなわち、第二発明は、上
記第一発明にさらにＣｕを必須成分として含むものであ
る。Ｃｕは寸法安定性等の向上に寄与することができる
点で第二発明がより好ましい。The sintered stainless steel material for a turbocharger according to the second aspect of the present invention has a Cr content of 8 to 28% by weight (preferably 9 to 23%).
% By weight, more preferably 10 to 20% by weight), Mo,
At least one of W, V and Ti: 1 to 10% by weight (preferably 2 to 10% by weight, more preferably 3 to 8% by weight), Cu: 0.5 to 5% by weight (preferably 0.5 to 5% by weight) 4
% By weight, more preferably 0.5 to 3% by weight), Si:
0.2-5% by weight (preferably 0.5-4% by weight, more preferably 0.5-3% by weight), C: 0.05-0.8%
% By weight (preferably 0.1 to 0.7% by weight, more preferably 0.1 to 0.6% by weight), O: 0.35% by weight or less (preferably 0.32% by weight or less, more preferably 0.
25% by weight or less), with the balance being Fe and unavoidable elements. That is, the second invention further includes Cu as an essential component in the first invention. The second invention is more preferable in that Cu can contribute to improvement in dimensional stability and the like.
【００１６】第一発明及び第二発明（以下、両者を「本
発明」という）の焼結体の構造としては、特に、マトリ
ックスがマルテンサイトであり、硬質粒子（分散材）と
してＣｒ、Ｍｏ、Ｗ、Ｖ及びＴｉの少なくとも１種のフ
ェロアロイが存在することが好ましい。フェロアロイと
しては、Ｆｅを含むものであれば良く、例えばＦｅ−Ｃ
ｒ系、Ｆｅ−Ｍｏ系、Ｆｅ−Ｗ系、Ｆｅ−Ｔｉ系、Ｆｅ
−Ｖ系等の２元系、Ｆｅ−Ｃｒ−Ｓｉ系、Ｆｅ−Ｃｒ−
Ｃ系等の３元系等が挙げられる。この中でも、フェロモ
リブデン、フェロタングステン、フェロバナジウム、フ
ェロチタン及びフェロクロムの少なくとも１種を用いる
のが好ましい。The structure of the sintered body of the first invention and the second invention (hereinafter, both are referred to as "the present invention") has a structure in which the matrix is martensite and the hard particles (dispersion material) are Cr, Mo, Preferably, at least one ferroalloy of W, V and Ti is present. The ferroalloy may be any as long as it contains Fe, for example, Fe-C
r system, Fe-Mo system, Fe-W system, Fe-Ti system, Fe
-V system, binary system, Fe-Cr-Si system, Fe-Cr-
A ternary system such as a C system is exemplified. Among them, it is preferable to use at least one of ferromolybdenum, ferrotungsten, ferrovanadium, ferrotitanium, and ferrochrome.
【００１７】マトリックスは、マルテンサイトが実質的
にマトリックスのすべてを占有していることが望ましい
が、本発明の効果を妨げない範囲内で他の合金相が存在
していても良い。マルテンサイトは、通常マトリックス
中５０体積％以上存在していれば良い。マルテンサイト
が本発明材料におけるマトリックスの主要構成成分とし
て存在することにより特に優れた機械的強度を発揮する
ことができる。The matrix preferably has substantially all of the martensite occupying the matrix, but other alloy phases may be present within a range that does not impair the effects of the present invention. The martensite usually only needs to be present at 50% by volume or more in the matrix. Particularly excellent mechanical strength can be exhibited by the presence of martensite as a main component of the matrix in the material of the present invention.
【００１８】硬質粒子が存在する場合、その存在割合
は、最終製品の用途、所望の合金特性等に応じて適宜設
定できるが、通常は本発明材料中１〜２０重量％程度、
好ましくは２〜１５重量％とすれば良い。かかる範囲内
に設定することにより特に耐摩耗性等の向上を図ること
ができる。また、硬質粒子の平均粒径も硬質粒子の種類
等によって適宜設定できるが、通常２０〜１５０μｍ程
度とすれば良い。When the hard particles are present, the proportion of the hard particles can be appropriately set according to the use of the final product, the desired alloy properties, and the like.
Preferably, it may be 2 to 15% by weight. By setting the content within such a range, it is possible to particularly improve the abrasion resistance and the like. The average particle size of the hard particles can be appropriately set depending on the type of the hard particles and the like, but is usually set to about 20 to 150 μm.
【００１９】本発明材料の製造方法は、例えば各合金成
分の原料粉末を用いて公知の粉末冶金における焼結体の
製造方法に従って実施することができる。例えば、原料
粉末を混合し、成形した後、この成形体を焼結すれば良
い。The method for producing the material of the present invention can be carried out, for example, according to a known method for producing a sintered body in powder metallurgy using the raw material powder of each alloy component. For example, after mixing and molding the raw material powders, the compact may be sintered.
【００２０】原料粉末としては、各成分ごとの単体粉末
を用いることもできるが、これらの２成分以上が合金化
した合金粉末を用いることもできる。特に、本発明では
Ｃｒ、Ｍｏ、Ｗ、Ｖ及びＴｉの少なくとも１種の供給源
の一部又は全部としてフェロアロイを用いることが好ま
しい。すなわち、前記のＦｅ−Ｃｒ系、Ｆｅ−Ｍｏ系、
Ｆｅ−Ｗ系、Ｆｅ−Ｔｉ系、Ｆｅ−Ｃｒ−Ｓｉ系等の合
金粉末を各成分の供給源の一部又は全部として用いるこ
とにより、これらの硬質粒子が分散材として存在する焼
結体を効率良く製造することができる。なお、Ｃ（炭
素）成分としては、特に黒鉛を用いることが好ましい。As the raw material powder, a single powder for each component can be used, but an alloy powder obtained by alloying two or more of these components can also be used. In particular, in the present invention, it is preferable to use a ferroalloy as a part or all of at least one kind of a supply source of Cr, Mo, W, V and Ti. That is, the above-mentioned Fe-Cr system, Fe-Mo system,
By using alloy powders such as Fe-W-based, Fe-Ti-based, and Fe-Cr-Si-based as part or all of the source of each component, a sintered body in which these hard particles are present as a dispersing material can be obtained. It can be manufactured efficiently. Note that it is particularly preferable to use graphite as the C (carbon) component.
【００２１】これらの原料粉末は、１種又は２種以上使
用できる。また、これらは公知の製法により得られるも
の又は市販品を用いることができる。原料粉末の平均粒
径は、特に制限されないが、通常２０〜１５０μｍ程度
とすれば良い。One or more of these raw material powders can be used. In addition, those obtained by a known production method or commercially available products can be used. The average particle size of the raw material powder is not particularly limited, but may be usually about 20 to 150 μm.
【００２２】原料粉末の成形は、公知の成形方法及び条
件を採用できる。例えば、プレス成形、ＨＩＰ法、ＣＩ
Ｐ法、ホットプレス法等が挙げられる。成形に際し、必
要に応じてバインダー、焼結助剤等の添加剤を配合する
こともできる。成形工程では、成形体の密度は、合金組
成等によって適宜変更できるが、通常は焼結体密度が６
〜７ｇ／ｃｍ3程度となるように調節すれば良い。For molding the raw material powder, known molding methods and conditions can be adopted. For example, press molding, HIP method, CI
P method, hot press method and the like. At the time of molding, additives such as a binder and a sintering aid can be blended as necessary. In the forming step, the density of the formed body can be appropriately changed depending on the alloy composition and the like.
It may be adjusted so as to be about 7 g / cm 3 .
【００２３】焼結工程では、成形体の焼結を行う。焼結
温度は、合金組成等に応じて適宜設定できるが、通常は
１１００〜１３００℃程度とすれば良い。焼結時間は、
焼結温度等に応じて適宜調整することができる。焼結雰
囲気は、通常は還元性雰囲気（アンモニアガス等）とす
れば良いが、必要に応じて真空中、不活性ガス雰囲気等
としても良い。焼結雰囲気の調整によって特に焼結体の
含有酸素量の制御を行うこともできる。In the sintering step, the compact is sintered. The sintering temperature can be appropriately set according to the alloy composition and the like, but is usually set to about 1100 to 1300 ° C. The sintering time is
It can be adjusted appropriately according to the sintering temperature and the like. The sintering atmosphere may be generally a reducing atmosphere (ammonia gas or the like), but may be a vacuum, an inert gas atmosphere, or the like, if necessary. By adjusting the sintering atmosphere, the content of oxygen in the sintered body can be particularly controlled.
【００２４】[0024]
【発明の効果】本発明の過給機用焼結ステンレス鋼材料
は、特定の合金組成から構成されていることから、耐熱
性・耐摩耗性に加えて、溶接性にも優れており、過給機
の構造材料として好適に用いることができる。Since the sintered stainless steel material for a turbocharger of the present invention is composed of a specific alloy composition, it has excellent weldability in addition to heat resistance and wear resistance. It can be suitably used as a structural material of a feeder.
【００２５】本発明の過給機用材料は、過給機のいずれ
の部位にも使用できる。また、本発明材料が適用できる
過給機の種類としては特に限定されず、スーパーチャジ
ャー、ターボチャジャー等のいずれのタイプであっても
良い。また、自動車過給機のほか、航空機、船舶等の過
給機にも適用することができる。特に、本発明では、自
動車過給機に適している。The supercharger material of the present invention can be used in any part of the supercharger. The type of the supercharger to which the material of the present invention can be applied is not particularly limited, and may be any type such as a supercharger and a turbocharger. Further, the present invention can be applied to a supercharger for an aircraft, a ship, and the like, in addition to a supercharger for an automobile. In particular, the present invention is suitable for an automobile supercharger.
【００２６】本発明材料を少なくとも一部に用いてなる
過給機は、溶接性に優れていることから各部位との接合
が強固であり、しかも耐熱性・耐摩耗性に優れているの
で従来品よりも優れた耐久性を発揮できる。The supercharger using at least a part of the material of the present invention is excellent in weldability, so that it is firmly bonded to each part and has excellent heat resistance and wear resistance. Higher durability than products.
【００２７】[0027]
【実施例】以下、実施例及び比較例を示し、本発明の特
徴とするところを明確にする。EXAMPLES Examples and comparative examples will be shown below to clarify features of the present invention.
【００２８】実施例〜１２及び比較例１〜６ 表１に示す原料粉末を用い、それぞれが表２に示す配合
割合となるように秤量し、均一に混合することによって
各混合原料を調製した。最終的な合金組成を表３に示
す。Examples 1 to 12 and Comparative Examples 1 to 6 Using the raw material powders shown in Table 1, each raw material powder was weighed so as to have a compounding ratio shown in Table 2, and uniformly mixed to prepare each mixed raw material. Table 3 shows the final alloy composition.
【００２９】[0029]
【表１】 [Table 1]
【００３０】[0030]
【表２】 [Table 2]
【００３１】[0031]
【表３】 [Table 3]
【００３２】次いで、各混合粉末を金型プレスによって
成形圧６ton／ｃｍ2で成形し、成形体を作製した。この
成形体を分解アンモニア雰囲気中１２００℃で１時間焼
結を行った。なお、実施例９は、焼結雰囲気を調整して
焼結体の含有酸素量が０．３２重量％となるように制御
した。Next, each mixed powder was molded by a mold press at a molding pressure of 6 ton / cm 2 to produce a molded body. This compact was sintered at 1200 ° C. for 1 hour in a decomposed ammonia atmosphere. In Example 9, the sintering atmosphere was adjusted to control the oxygen content of the sintered body to be 0.32% by weight.
【００３３】試験例１ 実施例及び比較例で得られた焼結体について常温及び高
温（５００℃）での引張試験、シャルピー衝撃試験、摩
耗試験及び溶接性試験を実施した。その結果を表４に示
す。なお、各試験における測定方法は下記の通りであ
る。 （１）引張試験 ＪＩＳ Ｚ ２５５０（１９８９）「機械構造部品用焼
結材料」に規定された引張試験方法に基づいて実施し
た。 （２）シャルピー衝撃試験 ＪＩＳ Ｚ ２５５０（１９８９）「機械構造部品用焼
結材料」に規定された衝撃試験方法に基づいて実施し
た。 （３）摩耗試験 大越式迅速摩耗試験機を用い、荷重：６１．７Ｎ、速
度：１０．４ｍ／秒、摩擦距離：１００ｍ、相手材：Ｓ
ＵＳ３０３の測定条件で行った。 （４）溶接性 相手材としてＳＵＳ３０３（溶製材）を用い、この相手
材との溶接を電子ビームで行い、溶接部のクラックの発
生の有無を肉眼で判定した。Test Example 1 The sintered bodies obtained in Examples and Comparative Examples were subjected to a tensile test, a Charpy impact test, a wear test, and a weldability test at ordinary temperature and high temperature (500 ° C.). Table 4 shows the results. The measuring method in each test is as follows. (1) Tensile test The tensile test was performed based on the tensile test method specified in JIS Z 2550 (1989) “Sintered material for machine structural parts”. (2) Charpy impact test The Charpy impact test was carried out based on the impact test method specified in JIS Z 2550 (1989) “Sintered material for machine structural parts”. (3) Wear test Using an Ogoshi quick wear tester, load: 61.7 N, speed: 10.4 m / sec, friction distance: 100 m, partner material: S
The measurement was performed under the measurement conditions of US303. (4) Weldability SUS303 (melted material) was used as a counterpart material, and welding with this counterpart material was performed with an electron beam, and the presence or absence of cracks in the welded portion was visually determined.
【００３４】[0034]
【表４】 [Table 4]
【００３５】表４の結果より、実施例の焼結体は、いず
れも、常温での引張強さ：５８０ＭＰａ以上、常温での
伸び：１％以上、５００℃での引張強さ：４６０ＭＰａ
以上、５００℃での伸び：０．７％以上、シャルピー衝
撃値：１０Ｊ／ｃｍ2以上、摩耗幅：１．３ｍｍ以下で
あり、かつ、溶接性も良好であることから、溶接性に優
れた過給機用焼結ステンレス鋼材料（溶接用焼結ステン
レス鋼材料）として有用であることがわかる。From the results shown in Table 4, all of the sintered bodies of the examples have a tensile strength at room temperature of 580 MPa or more, an elongation at room temperature of 1% or more, and a tensile strength at 500 ° C. of 460 MPa.
As described above, the elongation at 500 ° C .: 0.7% or more, the Charpy impact value: 10 J / cm 2 or more, the abrasion width: 1.3 mm or less, and the weldability is also good, so that the weldability is excellent. It turns out that it is useful as a sintered stainless steel material for turbochargers (sintered stainless steel material for welding).
【００３６】試験例２ 実施例１の焼結体について硬質粒子の存在を調べた。そ
の結果を図１に示す。図１では、走査型電子顕微鏡によ
る二次電子像（図１中「ＳＥＩ」）（大きな２つの薄い
色の部分）、組成像（図１中「ＢＥＩ」）（大きな２つ
の白っぽい部分）、ＦｅＫα線によるイメージ像（図１
中「ＦｅＫα」）（大きな２つの濃い色の部分）及びＭ
ｏＫα線によるイメージ像（図１中「ＭｏＫα」）（大
きな２つの白っぽい部分）を示す。これらの結果からも
明らかなように硬質粒子の存在が確認できる。特に、Ｂ
ＥＩの結果からも明らかなように、白っぽい部分がマト
リックスを構成する金属元素よりも重い金属元素である
ことからＦｅＭｏ粒子があることがわかる。また、この
粒子はＸ線回折分析により、ＦｅＭｏであることを同定
した。同様に、マトリックスがマルテンサイトであるこ
とも確認した。Test Example 2 The sintered body of Example 1 was examined for the presence of hard particles. The result is shown in FIG. In FIG. 1, the secondary electron image (“SEI” in FIG. 1) (large two light-colored portions), the composition image (“BEI” in FIG. 1) (two large whitish portions), FeKα Image image by line (Fig. 1
Middle "FeKα") (two large dark colored parts) and M
An image image (“MoKα” in FIG. 1) (two large whitish portions) by an oKα ray is shown. As is clear from these results, the presence of hard particles can be confirmed. In particular, B
As is clear from the result of EI, the whitish portion is a metal element which is heavier than the metal element constituting the matrix, indicating that FeMo particles are present. The particles were identified to be FeMo by X-ray diffraction analysis. Similarly, it was confirmed that the matrix was martensite.
【図１】実施例１で得られた焼結体の構造を示すイメー
ジ図である。FIG. 1 is an image diagram showing the structure of a sintered body obtained in Example 1.
フロントページの続き (72)発明者 植田 義久 京都府京都市山科区栗栖野狐塚５番地の１ 日本粉末合金株式会社内 (72)発明者 中村 真 京都府京都市山科区栗栖野狐塚５番地の１ 日本粉末合金株式会社内 Ｆターム(参考） 3G005 KA00 4K018 AA34 AB10 AC01 BA17 BA19 DA11 JA02 KA07 KA62 Continuation of front page (72) Inventor Yoshihisa Ueda 5-1, Kurisino Foxzuka, Yamashina-ku, Kyoto, Kyoto Japan Inside (72) Inventor Makoto Nakamura 1-5, Kurisino Foxzuka, Yamashina-ku, Kyoto, Kyoto Japan Alloy Co., Ltd. F term (reference) 3G005 KA00 4K018 AA34 AB10 AC01 BA17 BA19 DA11 JA02 KA07 KA62
Claims (7)
Ｔｉの少なくとも１種：１〜１０重量％、Ｓｉ：０．２
〜５重量％、Ｃ：０．０５〜０．８重量％、Ｏ：０．３
５重量％以下であって、残部がＦｅ及び不可避元素から
なることを特徴とする過給機用焼結ステンレス鋼材料。1. Cr: 8 to 28% by weight, at least one of Mo, W, V and Ti: 1 to 10% by weight, Si: 0.2
-5% by weight, C: 0.05-0.8% by weight, O: 0.3
A sintered stainless steel material for a turbocharger, which is 5% by weight or less, with the balance being Fe and unavoidable elements.
Ｔｉの少なくとも１種：１〜１０重量％、Ｃｕ：０．５
〜５重量％、Ｓｉ：０．２〜５重量％、Ｃ：０．０５〜
０．８重量％、Ｏ：０．３５重量％以下であって、残部
がＦｅ及び不可避元素からなることを特徴とする過給機
用焼結ステンレス鋼材料。2. Cr: 8 to 28% by weight, at least one of Mo, W, V and Ti: 1 to 10% by weight, Cu: 0.5
-5% by weight, Si: 0.2-5% by weight, C: 0.05-
A sintered stainless steel material for a turbocharger, wherein 0.8% by weight and O: 0.35% by weight or less, with the balance being Fe and unavoidable elements.
質粒子としてＣｒ、Ｍｏ、Ｗ、Ｖ及びＴｉの少なくとも
１種のフェロアロイが存在する請求項１又は２に記載の
過給機用焼結ステンレス鋼材料。3. The sintered stainless steel material for a turbocharger according to claim 1, wherein the matrix is martensite and at least one ferroalloy of Cr, Mo, W, V and Ti is present as hard particles. .
１種の供給源の一部又は全部としてフェロアロイを用
い、当該フェロアロイを含む原料粉末を成形及び焼結す
ることを特徴とする請求項１〜３のいずれかに記載の過
給機用焼結ステンレス鋼材料の製造方法。4. The method according to claim 1, wherein a ferroalloy is used as a part or all of at least one of Cr, Mo, W, V and Ti, and a raw material powder containing the ferroalloy is molded and sintered. The method for producing a sintered stainless steel material for a turbocharger according to any one of claims 1 to 3.
ロタングステン、フェロバナジウム、フェロチタン及び
フェロクロムの少なくとも１種である請求項４記載の製
造方法。5. The method according to claim 4, wherein the ferroalloy is at least one of ferromolybdenum, ferrotungsten, ferrovanadium, ferrotitanium and ferrochrome.
なくとも一部に用いてなる過給機。6. A supercharger comprising at least a part of the material according to claim 1.
なくとも一部に用いてなる自動車過給機。7. An automobile supercharger comprising at least a part of the material according to claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34523399A JP4385239B2 (en) | 1999-12-03 | 1999-12-03 | Sintered stainless steel material for supercharger and method for producing the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003049658A (en) * | 2001-08-03 | 2003-02-21 | Sogi Kogyo Kk | Manufacturing method for preform of variable vane in vgs(variable geometry system) type turbocharger |
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1999
- 1999-12-03 JP JP34523399A patent/JP4385239B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003049658A (en) * | 2001-08-03 | 2003-02-21 | Sogi Kogyo Kk | Manufacturing method for preform of variable vane in vgs(variable geometry system) type turbocharger |
| JP4638090B2 (en) * | 2001-08-03 | 2011-02-23 | 株式会社アキタファインブランキング | Method for manufacturing variable blade profile in VGS type turbocharger |
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