JPH09118965A - Iron base sintered alloy having excellent fatigue strength - Google Patents
Iron base sintered alloy having excellent fatigue strengthInfo
- Publication number
- JPH09118965A JPH09118965A JP27550395A JP27550395A JPH09118965A JP H09118965 A JPH09118965 A JP H09118965A JP 27550395 A JP27550395 A JP 27550395A JP 27550395 A JP27550395 A JP 27550395A JP H09118965 A JPH09118965 A JP H09118965A
- Authority
- JP
- Japan
- Prior art keywords
- iron
- sintered alloy
- area ratio
- based sintered
- weight
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
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- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、コンロッド、オ
イルポンプローター、ギャポンプなどの機械部品の材料
として用いられる疲労強度に優れた鉄基焼結合金に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron-based sintered alloy having excellent fatigue strength, which is used as a material for machine parts such as connecting rods, oil pump rotors and gear pumps.
【０００２】[0002]
【従来の技術】従来、コンロッド、オイルポンプロータ
ー、ギャポンプなどの機械部品の部材として、Ｎｉ：
４．０重量％、Ｃｕ：１．４重量％、Ｍｏ：０．５重量
％を含有し、残りがＦｅおよび不可避不純物からなる組
成を有する合金鋼粉末にＣ：０．７重量％を添加し、さ
らに潤滑剤としてステアリン酸亜鉛粉末を外比で０．８
％添加して混合し、プレス成形して圧粉体を作製し、圧
粉体を窒素雰囲気中、１２００℃、６０分保持の条件で
焼結し、その後、窒素雰囲気中、８７０℃、３０分間加
熱保持し、ついで８０℃の油に入れて油焼き入れし、２
５０℃、６０分間保持の低温焼戻し処理することにり得
られる鉄基焼結合金が知られている（例えば、特開昭６
２−２８８７１３号公報参照）。2. Description of the Related Art Conventionally, Ni: has been used as a member of mechanical parts such as connecting rods, oil pump rotors, and gear pumps.
C: 0.7% by weight was added to an alloy steel powder containing 4.0% by weight, Cu: 1.4% by weight, Mo: 0.5% by weight, and the balance of Fe and inevitable impurities. , And zinc stearate powder as a lubricant in an external ratio of 0.8
%, Added and mixed, and pressed to produce a green compact, which is sintered in a nitrogen atmosphere at 1200 ° C. for 60 minutes and then sintered in a nitrogen atmosphere at 870 ° C. for 30 minutes. Heat and hold, then put in oil at 80 ° C and oil quench, 2
An iron-based sintered alloy obtained by performing a low temperature tempering treatment at 50 ° C. for 60 minutes is known (see, for example, Japanese Patent Laid-Open Publication No. Sho 6-66).
No. 2-288713).
【０００３】[0003]
【発明が解決しようとする課題】しかし、近年、作業の
高性能化、高出力化および高速化にともない、機械装置
に組み込まれている機械部品は従来よりも一段と苛酷な
条件での繰り返し負荷が加えられ、このため、疲労強度
に優れたの鉄基焼結合金からなる機械部品が求められて
いる。ところが上記従来の鉄基焼結合金は、疲労強度が
不足していた。However, in recent years, as the performance, output and speed of work have become higher, the mechanical parts incorporated in mechanical devices are subject to repetitive load under more severe conditions than before. For this reason, there is a demand for a mechanical part made of an iron-based sintered alloy having excellent fatigue strength. However, the above-mentioned conventional iron-based sintered alloys have insufficient fatigue strength.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者らは、
上述のような観点から、機械部品の材料として、従来よ
りも疲労強度に優れたの鉄基焼結合金を得るべく研究を
行った結果、原料粉末として、平均粒径：３０〜７０μ
ｍのＭｎを微量含むＦｅ粉末、平均粒径：１．５〜３．
５μｍのＮｉ粉末および平均粒径：３〜３０μｍのＣ粉
末を用意し、これら原料粉末を金型成形時の潤滑剤であ
るステアリン酸亜鉛粉末とともに混合し、プレス成形し
て圧粉体を作製し、圧粉体を窒素−水素ベースの雰囲気
中、１１００〜１１５０℃、１０〜６０分保持の条件で
焼結して得られた焼結体を、その後、浸炭雰囲気中、８
３０〜９７０℃、１０〜６０分間加熱保持し、ついで油
焼き入れし、１５０〜３００℃、１０〜６０分間保持の
焼戻し処理を施すと、Ｎｉ：１．５〜４．５重量％、
Ｃ：０．２〜０．７重量％、Ｍｎ：０．０１〜０．０５
重量％を含有し、残りがＦｅおよび不可避不純物からな
る組成を有する鉄基焼結合金であって、その鉄基焼結合
金の表面から０．５ｍｍ以内の深さの表面部はマルテン
サイト素地中に面積率：０．５〜７％のオーステナイト
が分散した組織を有し、それより内部は微細パーライト
素地中に面積率：３０〜６０％のマルテンサイトが分散
しており、このマルテンサイトの中心部に面積率で０．
５〜７％のオーステナイトが存在している組織を有する
鉄基焼結合金が得られ、この鉄基焼結合金は、従来の鉄
基焼結合金と比較して、強度が格段に優れているという
知見を得たのである。Means for Solving the Problems Accordingly, the present inventors have:
From the above viewpoints, as a result of conducting research to obtain an iron-based sintered alloy having better fatigue strength than conventional materials as a material for machine parts, as a raw material powder, an average particle diameter: 30 to 70 μm
Fe powder containing a trace amount of Mn, average particle size: 1.5-3.
5 μm Ni powder and C powder having an average particle size of 3 to 30 μm were prepared, and these raw material powders were mixed with zinc stearate powder, which is a lubricant at the time of mold molding, and press molded to prepare a green compact. The sintered body obtained by sintering the green compact in a nitrogen-hydrogen-based atmosphere under the conditions of 1100 to 1150 ° C. and a holding time of 10 to 60 minutes is then subjected to a carburizing atmosphere of 8
Ni: 1.5-4.5% by weight, when heated and held at 30 to 970 ° C. for 10 to 60 minutes, then oil-quenched and tempered at 150 to 300 ° C. for 10 to 60 minutes.
C: 0.2 to 0.7% by weight, Mn: 0.01 to 0.05
An iron-based sintered alloy having a composition containing wt% and the balance being Fe and unavoidable impurities, the surface portion of which has a depth within 0.5 mm from the surface of the iron-based sintered alloy has a martensite base material. Has a structure in which austenite with an area ratio of 0.5 to 7% is dispersed, and inside of it, martensite with an area ratio of 30 to 60% is dispersed in the fine pearlite matrix, and the center of this martensite is The area ratio is 0.
An iron-based sintered alloy having a structure in which 5 to 7% of austenite is present is obtained, and this iron-based sintered alloy is remarkably excellent in strength as compared with conventional iron-based sintered alloys. I got the knowledge that.
【０００５】この発明は、かかる知見にもとづいて成さ
れたものであって、Ｎｉ：１．５〜４．５重量％、Ｃ：
０．２〜０．７重量％、Ｍｎ：０．０１〜０．０５重量
％を含有し、残りがＦｅおよび不可避不純物からなる組
成を有する鉄基焼結合金であって、その鉄基焼結合金の
表面から０．５ｍｍ以内の深さの表面部はマルテンサイ
ト素地中に面積率：０．５〜７％のオーステナイトが分
散した組織を有し、それより内部は微細パーライト素地
中に面積率：３０〜６０％のマルテンサイトが分散して
おり、この分散したマルテンサイトの中心部に面積率で
０．５〜７％のオーステナイトが存在していることを特
徴とする疲労強度に優れた鉄基焼結合金、に特徴を有す
るものである。The present invention was made on the basis of such findings, and Ni: 1.5 to 4.5% by weight, C:
An iron-based sintered alloy having a composition of 0.2 to 0.7% by weight, Mn: 0.01 to 0.05% by weight, and the balance of Fe and inevitable impurities. The surface portion having a depth of 0.5 mm or less from the surface of gold has a structure in which austenite of area ratio: 0.5 to 7% is dispersed in the martensite matrix, and the inside thereof is the area ratio in the fine pearlite matrix. : 30 to 60% of martensite is dispersed, and 0.5 to 7% of austenite in area ratio is present in the central portion of the dispersed martensite. It is characterized by a base sintered alloy.
【０００６】つぎに、この発明の鉄基焼結合金の成分組
成および組織を上記のごとく限定した理由について説明
する。 Ａ、成分組成 （ａ）Ｎｉ：Ｎｉは、疲労強度および靭性を向上させる
作用があるが、その含有量が１．５重量％未満ではその
効果が十分でなく、一方、４．５重量％を越えて含有し
てもその効果が少ないところから、Ｎｉの含有量は、
１．５〜４．５重量％に定めた。Ｎｉの含有量の一層好
ましい範囲は２．５〜４重量％である。Next, the reason why the composition and structure of the iron-based sintered alloy of the present invention are limited as described above will be explained. A, component composition (a) Ni: Ni has an effect of improving fatigue strength and toughness, but if its content is less than 1.5% by weight, its effect is not sufficient, while 4.5% by weight is added. The content of Ni is
It was set to 1.5 to 4.5% by weight. A more preferable range of the Ni content is 2.5 to 4% by weight.
【０００７】（ｂ）Ｃ：Ｃは、素地に固溶して疲労強度
を向上させる効果があるが、その含有量が０．２重量％
未満では効果が十分でなく、一方、０．７重量％を越え
て含有すると材料を脆化を促進させるので好ましくな
い。したがって、Ｃの含有量は、０．２〜０．７重量％
に定めた。Ｃの含有量の一層好ましい範囲は０．３〜
０．５重量％である。(B) C: C has the effect of improving the fatigue strength by forming a solid solution in the matrix, but its content is 0.2% by weight.
If it is less than 0.7% by weight, the effect is not sufficient. On the other hand, if it exceeds 0.7% by weight, embrittlement of the material is promoted, which is not preferable. Therefore, the content of C is 0.2 to 0.7% by weight.
Determined. A more preferable range of the C content is 0.3 to
0.5% by weight.
【０００８】（ｃ）Ｍｎ：Ｍｎは、素地に固溶して強度
を向上させる作用があるが、その含有量が０．０１重量
％未満では所望の効果が得られず、一方、０．０５重量
％を越えると圧縮性、焼結性を阻害し、材料の疲労強度
と靭性を低下させるところからその含有量は、０．０１
〜０．０５重量％に定めた。(C) Mn: Mn has the function of forming a solid solution in the matrix to improve the strength, but if its content is less than 0.01% by weight, the desired effect cannot be obtained, while 0.05 If the content exceeds 0.01% by weight, the compressibility and sinterability are impaired, and the fatigue strength and toughness of the material are lowered, so the content is 0.01%.
.About.0.05% by weight.
【０００９】Ｂ、組織 この発明の鉄基焼結合金は、表面から０．５ｍｍ以内と
それより内部とは組織が相違し、表面から０．５ｍｍ以
内の深さの表面部はマルテンサイト素地中に面積率：
０．５〜７％のオーステナイトが分散した組織を有し、
それより内部は微細パーライト素地中に面積率：３０〜
６０％のマルテンサイトが分散しており、このマルテン
サイトの中心部に０．５〜７％の面積率でオーステナイ
トが存在している組織を有している。B, Structure The iron-based sintered alloy of the present invention has a structure within 0.5 mm from the surface and different from the inside, and the surface portion at a depth within 0.5 mm from the surface is in the martensite matrix. Area ratio to:
It has a structure in which 0.5 to 7% of austenite is dispersed,
The area ratio is 30-
It has a structure in which 60% of martensite is dispersed and austenite is present at an area ratio of 0.5 to 7% in the central portion of this martensite.
【００１０】オーステナイトは疲労亀裂の進展を阻害す
る組織であるが、その面積率が０．５％未満では所望の
効果が得られず、一方、７％を越えると強度が低下する
ので好ましくない。したがって、表面から０．５ｍｍま
での表面部およびそれより内部におけるオーステナイト
の面積率を０．５〜７％に限定した。Austenite is a structure that inhibits the development of fatigue cracks, but if the area ratio is less than 0.5%, the desired effect cannot be obtained, while if it exceeds 7%, the strength decreases, which is not preferable. Therefore, the area ratio of austenite in the surface portion up to 0.5 mm from the surface and inside thereof is limited to 0.5 to 7%.
【００１１】マルテンサイトは材料を強化および硬化さ
せる組織であるが、表面から０．５ｍｍより内部におけ
るマルテンサイトの面積率が３０％未満では所望の効果
が得られず、一方、６０％を越えると材料を脆化させる
ので好ましくない。したがって、表面部より内部におけ
るマルテンサイトの面積率を３０〜６０％に限定した。
表面から０．５ｍｍより内部におけるマルテンサイトの
面積率の一層好ましい範囲は、４０〜５５％である。Martensite is a structure that strengthens and hardens the material, but if the area ratio of martensite within 0.5 mm from the surface is less than 30%, the desired effect cannot be obtained, while if it exceeds 60%. It is not preferable because it embrittles the material. Therefore, the area ratio of martensite inside the surface portion is limited to 30 to 60%.
A more preferable range of the area ratio of martensite within the area of 0.5 mm from the surface is 40 to 55%.
【００１２】[0012]
【発明の実施の形態】前記組織を有するこの発明の鉄基
焼結合金の製造方法について詳述する。まず、原料粉末
として、Ｍｎ：０．０１〜０．０５重量％を含む平均粒
径：４０〜６０μｍのＦｅ粉末、平均粒径：１．５〜
３．５μｍのＮｉ粉末および平均粒径：３〜３０μｍの
Ｃ粉末を用意する。この場合、Ｎｉ、ＣおよびＭｎを含
む合金鋼粉末を使用することは圧粉成形時の圧縮性を低
下させるので好ましくない。BEST MODE FOR CARRYING OUT THE INVENTION A method for producing an iron-based sintered alloy of the present invention having the above structure will be described in detail. First, as a raw material powder, Fe powder containing Mn: 0.01 to 0.05% by weight and having an average particle size: 40 to 60 μm, average particle size: 1.5 to
A Ni powder of 3.5 μm and a C powder of average particle diameter: 3 to 30 μm are prepared. In this case, it is not preferable to use the alloy steel powder containing Ni, C and Mn because the compressibility at the time of powder compaction is reduced.
【００１３】これら原料粉末を配合し混合し、プレス成
形して圧粉体を作製し、圧粉体を窒素−水素ベースの雰
囲気中、１１００〜１１５０℃、１０〜６０分保持の条
件で焼結して得られた焼結体を、その後、浸炭窒素雰囲
気中、８３０〜９７０℃、１０〜６０分間加熱保持し、
ついで油焼き入れし、１５０〜３００℃、１０〜６０分
間保持の焼戻し処理すと、Ｎｉ：１．５〜４．５重量
％、Ｃ：０．２〜０．７重量％、Ｍｎ：０．０１〜０．
０５重量％を含有し、残りがＦｅおよび不可避不純物か
らなる組成を有する鉄基焼結合金であって、その鉄基焼
結合金の表面から０．５ｍｍ以内の深さの表面部はマル
テンサイト素地中に面積率：０．５〜７％のオーステナ
イトが分散した組織を有し、それより内部は微細パーラ
イト素地中に面積率：３０〜６０％のマルテンサイトが
分散しており、このマルテンサイトの中心部に面積率で
０．５〜７％のオーステナイトが存在している組織を有
する鉄基焼結合金が得られる。These raw material powders are blended, mixed and pressed to produce a green compact, which is sintered in a nitrogen-hydrogen base atmosphere at 1100 to 1150 ° C. for 10 to 60 minutes. The sintered body thus obtained is then heated and held at 830 to 970 ° C. for 10 to 60 minutes in a carburized nitrogen atmosphere,
Then, it is oil-quenched and tempered by holding at 150 to 300 ° C. for 10 to 60 minutes. Ni: 1.5 to 4.5% by weight, C: 0.2 to 0.7% by weight, Mn: 0. 01-0.
An iron-based sintered alloy containing 0.05% by weight and the balance of Fe and inevitable impurities, the surface of the iron-based sintered alloy having a depth within 0.5 mm from the surface of the martensite matrix. It has a structure in which austenite having an area ratio of 0.5 to 7% is dispersed therein, and inside thereof, martensite having an area ratio of 30 to 60% is dispersed in a fine pearlite matrix. It is possible to obtain an iron-based sintered alloy having a structure in which austenite of 0.5 to 7% in area ratio is present in the central portion.
【００１４】[0014]
【実施例】原料粉末として、表１〜表２に示される平均
粒径を有するＦｅ粉末、Ｎｉ粉末およびＣ粉末を用意
し、これら原料粉末を表１〜表２に示される割合に配合
し、さらに潤滑剤であるステアリン酸亜鉛を添加した
後、ダブルコーンミキサーで十分に混合し、得られた混
合粉末を９０ｍｍ×１３ｍｍ×１０ｍｍの寸法および
７．０ｇ／ｃｃの密度を有する金型圧粉体に成形した。
得られた金型圧粉成形体をＮ2 −１０％Ｈ2 の雰囲気
中、１１２０℃で３０分間保持の条件で焼結し、得られ
た焼結体を浸炭雰囲気中、温度：９００℃、３０分間保
持したのち９００℃から油焼き入れし、ついで焼結雰囲
気と同じＮ2 −１０％Ｈ2 の雰囲気中、１８０℃、６０
分保持の焼き戻し処理を施すことにより表１〜表２に示
される本発明鉄基焼結合金１〜１０および比較鉄基焼結
合金１〜９を作製した。EXAMPLES As raw material powders, Fe powder, Ni powder and C powder having average particle diameters shown in Tables 1 and 2 were prepared, and these raw material powders were blended in the proportions shown in Tables 1 and 2, Further, zinc stearate as a lubricant was added, and then thoroughly mixed with a double cone mixer, and the resulting mixed powder was molded into a mold having a size of 90 mm × 13 mm × 10 mm and a density of 7.0 g / cc. Molded into.
The obtained die powder compact was sintered in an atmosphere of N 2 -10% H 2 under the conditions of holding at 1120 ° C. for 30 minutes, and the obtained sintered body was in a carburizing atmosphere at a temperature of 900 ° C. After holding it for 30 minutes, it was oil-quenched at 900 ° C., and then at 180 ° C. and 60 ° C. in the same N 2 -10% H 2 atmosphere as the sintering atmosphere.
The iron-based sintered alloys 1 to 10 of the present invention and the comparative iron-based sintered alloys 1 to 9 shown in Tables 1 and 2 were produced by carrying out tempering treatment for holding minutes.
【００１５】さらに比較のために、Ｎｉ：４．０重量
％、Ｃｕ：１．４重量％、Ｍｏ：０．５重量％、Ｃ：
０．７重量％を含有し、残りがＦｅおよび不可避不純物
からなる組成を有する従来鉄基焼結合金を用意した。こ
れら本発明鉄基焼結合金１〜１０、比較鉄基焼結合金１
〜９および従来鉄基焼結合金について化学組成分析を行
い、その結果得られた成分組成を表１〜表２に示した。For comparison, Ni: 4.0% by weight, Cu: 1.4% by weight, Mo: 0.5% by weight, C:
A conventional iron-based sintered alloy containing 0.7% by weight and the balance of Fe and inevitable impurities was prepared. The present invention iron-based sintered alloys 1 to 10 and comparative iron-based sintered alloy 1
9 and conventional iron-based sintered alloys were subjected to chemical composition analysis, and the resulting component compositions are shown in Tables 1 and 2.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【表２】 [Table 2]
【００１８】さらに、これら本発明鉄基焼結合金１〜１
０、比較鉄基焼結合金１〜９および従来鉄基焼結合金に
ついて画像解析による組織定量を行い、その結果を表３
〜表４に示した。また、これら本発明鉄基焼結合金１〜
１０、比較鉄基焼結合金１〜９および従来鉄基焼結合金
を機械加工して試験片を作製し、この試験片を用いてＪ
ＩＳ Ｚ２２７４に基づく回転曲げ疲労試験を行い、１
０7 回での疲労強度を求め、その結果を表３〜表４に示
した。Further, these iron-based sintered alloys 1 to 1 of the present invention
0, comparative iron-based sintered alloys 1 to 9 and conventional iron-based sintered alloys were quantified by image analysis, and the results are shown in Table 3.
~ Shown in Table 4. In addition, the present invention iron-based sintered alloy 1 ~
10, the comparative iron-based sintered alloys 1 to 9 and the conventional iron-based sintered alloys were machined to prepare a test piece, and the test piece was used.
A rotary bending fatigue test based on IS Z2274 was performed and 1
The fatigue strength at 0 7 times was determined, and the results are shown in Tables 3 to 4.
【００１９】[0019]
【表３】 [Table 3]
【００２０】[0020]
【表４】 [Table 4]
【００２１】この発明の鉄基焼結合金の組織を一層理解
しやすくするために、本発明鉄基焼結合金１の表面から
２．５ｍｍの深さの組織を金属顕微鏡により観察し、組
織写生図を図１に示し、さらに比較のために従来鉄基焼
結合金の組織写生図を図２に示した。図１の組織写生図
において、表面から０．５ｍｍの深さの組織はマルテン
サイト素地中に面積率：０．５〜７％のオーステナイト
が分散した組織を有し、表面から０．５ｍｍを越える深
さの組織は微細パーライト素地中に面積率：３０〜６０
％のマルテンサイトが分散しており、このマルテンサイ
トの中心部に面積率で０．５〜７％のオーステナイトが
存在している組織を有することが分かる。In order to make it easier to understand the structure of the iron-based sintered alloy of the present invention, the structure of the iron-based sintered alloy 1 of the present invention having a depth of 2.5 mm from the surface is observed by a metallographic microscope, and the structure is reproduced. The figure is shown in FIG. 1, and the structure drawing of the conventional iron-based sintered alloy is shown in FIG. 2 for comparison. In the structure drawing of FIG. 1, the structure with a depth of 0.5 mm from the surface has a structure in which austenite with an area ratio of 0.5 to 7% is dispersed in the martensite matrix, and exceeds 0.5 mm from the surface. The depth of the structure is 30-60 in the fine pearlite matrix.
% Martensite is dispersed, and it has a structure in which austenite of 0.5 to 7% in area ratio is present in the central portion of this martensite.
【００２２】[0022]
【発明の効果】表１〜表４に示した結果から、本発明鉄
基焼結合金１〜１０は、比較鉄基焼結合金１〜９および
従来鉄基焼結合金に比べて、一段と優れた疲労強度を有
することが分かる。上述のように、この発明の鉄基焼結
合金は、疲労強度が優れているので、機械装置の部品の
材料として、優れた性能を長期にわたって発揮すること
ができ、工業上優れた効果をもたらすものである。From the results shown in Tables 1 to 4, the iron-based sintered alloys 1 to 10 of the present invention are far superior to the comparative iron-based sintered alloys 1 to 9 and the conventional iron-based sintered alloys. It can be seen that it has excellent fatigue strength. As described above, since the iron-based sintered alloy of the present invention has excellent fatigue strength, it can exhibit excellent performance as a material for parts of machinery and equipment for a long period of time, and has an industrially excellent effect. It is a thing.
【図１】この発明の鉄基焼結合金の金属顕微鏡による写
生図である。FIG. 1 is a drawing of an iron-based sintered alloy of the present invention, taken with a metallurgical microscope.
【図２】従来の鉄基焼結合金の金属顕微鏡による写生図
である。FIG. 2 is a drawing of a conventional iron-based sintered alloy with a metallurgical microscope.
Claims (1)
２〜０．７重量％、Ｍｎ：０．０１〜０．０５重量％を
含有し、残りがＦｅおよび不可避不純物からなる組成を
有する鉄基焼結合金であって、この鉄基焼結合金の表面
から０．５ｍｍ以内の深さの表面部はマルテンサイト素
地中に面積率：０．５〜７％のオーステナイトが分散し
た組織を有し、それより内部は微細パーライト素地中に
面積率：３０〜６０％のマルテンサイトが分散してお
り、このマルテンサイトの中心部に面積率で０．５〜７
％のオーステナイトが存在している組織を有することを
特徴とする疲労強度に優れた鉄基焼結合金。1. Ni: 1.5 to 4.5% by weight, C: 0.
An iron-based sintered alloy having a composition of 2 to 0.7% by weight, Mn: 0.01 to 0.05% by weight, and the balance of Fe and inevitable impurities. The surface portion having a depth of 0.5 mm or less from the surface has a structure in which austenite having an area ratio of 0.5 to 7% is dispersed in the martensite matrix, and the inside thereof has an area ratio of 30 in the fine pearlite matrix. ~ 60% of martensite is dispersed, and the area ratio is 0.5 ~ 7 at the center of this martensite.
% Of austenite is present in the iron-based sintered alloy having excellent fatigue strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27550395A JP3314596B2 (en) | 1995-10-24 | 1995-10-24 | Iron-based sintered alloy with excellent fatigue strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27550395A JP3314596B2 (en) | 1995-10-24 | 1995-10-24 | Iron-based sintered alloy with excellent fatigue strength |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09118965A true JPH09118965A (en) | 1997-05-06 |
| JP3314596B2 JP3314596B2 (en) | 2002-08-12 |
Family
ID=17556402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27550395A Expired - Fee Related JP3314596B2 (en) | 1995-10-24 | 1995-10-24 | Iron-based sintered alloy with excellent fatigue strength |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3314596B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007138226A (en) * | 2005-11-16 | 2007-06-07 | Jtekt Corp | Iron-base sintered parts, method for manufacturing iron-base sintered parts, and actuator |
-
1995
- 1995-10-24 JP JP27550395A patent/JP3314596B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007138226A (en) * | 2005-11-16 | 2007-06-07 | Jtekt Corp | Iron-base sintered parts, method for manufacturing iron-base sintered parts, and actuator |
| US8491695B2 (en) | 2005-11-16 | 2013-07-23 | Jtekt Corporation | Iron-base sintered part, manufacturing method of iron-base sintered part and actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3314596B2 (en) | 2002-08-12 |
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