JPH01201422A - Heat treatment for m-50 steel for bearing for high-temperature service - Google Patents
Heat treatment for m-50 steel for bearing for high-temperature serviceInfo
- Publication number
- JPH01201422A JPH01201422A JP2542088A JP2542088A JPH01201422A JP H01201422 A JPH01201422 A JP H01201422A JP 2542088 A JP2542088 A JP 2542088A JP 2542088 A JP2542088 A JP 2542088A JP H01201422 A JPH01201422 A JP H01201422A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- steel
- temp
- service
- carbides
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 18
- 239000010959 steel Substances 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 title description 2
- 238000002791 soaking Methods 0.000 claims abstract description 17
- 238000005242 forging Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 4
- 150000001247 metal acetylides Chemical class 0.000 abstract description 17
- 229910001339 C alloy Inorganic materials 0.000 abstract 3
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 229910052720 vanadium Inorganic materials 0.000 abstract 1
- 238000005204 segregation Methods 0.000 description 3
- 210000001787 dendrite Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は高温で使用する軸受用鋼の炭化物の微細化熱処
理方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a heat treatment method for refining carbides in bearing steel used at high temperatures.
（従来技術と問題点）
現在ジェットエンジンのメインシャフト等の高温用軸受
には材料としてＡｌ５Ｉ Ｍ−５０（０，８Ｃ−４Ｃ
ｒ−４Ｍｏ−Ｉ Ｖ）が主として用いられるがその用途
上高信頼性と長寿命が常に要求されている。Ｍ−５０中
に存在する炭化物は耐摩耗性や高い硬さを付与するため
に不可欠のものであるが、その一方で巨大な炭化物は応
力集中源となり寿命に好ましくない影響をおよぼす。寿
命の改善には一般には鋼中の酸化物ないし介在物を低減
させることが有効であるが、Ｍ−５０の場合それだけで
は十分でなく上述のごとく炭化物を微細化する必要があ
る。鋼中の炭化物の微細化には本発明はかかる点を考慮
してＭ−５０に代表される高温軸受用鋼の炭化物の微細
化を検討した結果なされたものである。(Prior art and problems) Currently, Al5I M-50 (0,8C-4C
r-4Mo-IV) is mainly used, but high reliability and long life are always required for its use. The carbides present in M-50 are essential for imparting wear resistance and high hardness, but on the other hand, large carbides become a stress concentration source and have an undesirable effect on life. Generally speaking, it is effective to reduce the oxides or inclusions in steel to improve the service life, but in the case of M-50, this alone is not sufficient and it is necessary to refine the carbides as described above. With regard to the refinement of carbides in steel, the present invention was developed as a result of studies on the refinement of carbides in steel for high-temperature bearings, typified by M-50, in consideration of these points.
（問題点の解決手段）
すなわち本発明は鋼塊を一度鍛練比（ｌ塊の断面積と圧
鍛成品の断面積の比）を２以上で加工ししかる後１１５
０〜１２２０℃で２時間以上均熱処理をすることにより
炭化物を微細化することを特徴としている。(Means for Solving Problems) That is, the present invention processes a steel ingot once at a forging ratio (the ratio of the cross-sectional area of the ingot to the cross-sectional area of the cold-forged product) of 2 or more, and then
It is characterized in that the carbide is made fine by performing soaking treatment at 0 to 1220°C for 2 hours or more.
（作用）
均熱処理はＳＵＪ ２などでは通常鋼塊の状態でおこな
われるが、高炭素でかつ合金元素量の多いＭ−５０など
の高速度鋼では偏析のはげしい中心部などで均熱処理に
より炭化物が溶融によってかえって巨大化することがあ
るため通常は行われていない。そこで種々検討した結果
Ｍ−５０の鋼塊を鍛練比２以上に一度加工し、それを適
正な条件で均熱処理すると炭化物が巨大化することはな
く、身命も良好となることが判明した。この理由は鋼塊
を一度鍛練比２以上に加工することにより、炭化物、偏
析、デンドライト等がある稈度微細化もしくは軽減され
、しかる後均熱処理を行なうと炭化物の溶融等は起こら
ず炭化物の微細化がなされるものと思われる。(Function) Soaking treatment is usually carried out in the form of steel ingots, such as SUJ 2, but in high-speed steels such as M-50, which have a high carbon content and a large amount of alloying elements, soaking treatment removes carbides in the center where segregation is severe. This is not normally done because it may actually become larger due to melting. As a result of various studies, it was found that if an M-50 steel ingot is worked once to a forging ratio of 2 or more and then soaked under appropriate conditions, the carbides will not become huge and life will be good. The reason for this is that once a steel ingot is processed to a forging ratio of 2 or more, the culm of carbides, segregation, dendrites, etc. is refined or reduced, and when a subsequent soaking treatment is performed, the carbides do not melt and the carbides become fine. It seems likely that changes will be made.
次に特許請求範囲を定めた理由を述べる。Next, we will explain the reasons for defining the scope of claims.
（１）鍛練比２以上
鍛練比が２以上でないと鋼塊中の炭化物、偏析およびデ
ンドライト等の微細化が十分でなく、後の均熱処理の効
果が得られないので鍛練比を２以上とした。(1) Forging ratio of 2 or more If the forging ratio is not 2 or more, carbides, segregation, dendrites, etc. in the steel ingot will not be sufficiently refined, and the effect of subsequent soaking treatment will not be obtained, so the forging ratio was set to 2 or more. .
（２）均熱温度
前述の鍛練比との関係で１１５０℃〜１２２Ｏ℃の間で
炭化物は微細化し、１１５０℃以下では微細化せず、１
２２０℃以上ではかえって炭化物の溶融が起こる可能性
がある為、下限を１１５０℃に、上限を１２２０℃とし
た。(2) Soaking temperature: Due to the relationship with the forging ratio mentioned above, carbides become finer between 1150°C and 1220°C, and do not become finer below 1150°C.
Since melting of carbides may occur at temperatures above 220°C, the lower limit was set to 1150°C and the upper limit was set to 1220°C.
（３）保持時間２時間以上
有効保持時間が２詩間以上でないと炭化物の微細化が起
こらないので下限を２時間とする（実施例）
表１に供試材および均熱条件およびスラスト型試験機に
よる寿命試験結果を示す。このように鍛練比２以上、１
１５０℃〜１２２０℃で保持時間２時間以上の均熱処理
において良好な寿命が得られている。(3) Holding time of 2 hours or more Since carbide refinement does not occur unless the effective holding time is 2 hours or more, the lower limit is set to 2 hours (Example) Table 1 shows the test materials, soaking conditions, and thrust type test. The machine life test results are shown below. In this way, the training ratio is 2 or more, 1
A good lifespan was obtained in soaking treatment at 150°C to 1220°C for a holding time of 2 hours or more.
このような良好な寿命が得られるのは、第１図に示すよ
うに、鋼塊のままで均熱処理するよりも鍛練比が２以上
の鍛圧を行ったあと均熱処理した方が炭化物が微細化す
るためであろう。As shown in Figure 1, such a good life can be obtained because the carbides become finer when soaking after forging with a forging ratio of 2 or more is performed, rather than soaking the steel ingot as it is. Probably for the purpose of doing so.
（産業上の利用分野）
かかる発明を実施することにより高温軸受の寿命が改善
され、航空機用エンジン用軸受の信頼性が著しく向上す
る。(Industrial Application Field) By implementing the invention, the life of high-temperature bearings is improved, and the reliability of aircraft engine bearings is significantly improved.
第１図（ａ）は本発明により、鍛練比＝３の鍛合の４０
０倍顕微鏡写真である。第２図は均熱処理前の鍛練比の
寿命に及ぼす影響を示すグラフである。
第１ ロ
（Ｆ′）鍛造後均熱 （ｂｌ鋳造のまま均熱×
４００
１２００”Ｃｘ６ｈｒ八、Ｃ
（矢印は炭化物を示ｇ）
言２図
鍛 練 比
１、事件の表示
昭和６３年特許願第 ２５４２０号
３、補正をする者
４、補正命令の日付
昭和６３年５月３１日 （発送し１）
ｉ、補正の対象
補正書
捕ｉ’ＩＥ ＋１の内容
（１）明細；Ｒ第６頁 ５行目
［均熱処理したものの４００４８顕微鏡］とあるを「均
熱処理したものの主居組皇り４００倍顕微鏡」と補正す
る。
（２）明細占 第６頁 ７行目
［合の４００４ｉ３顕微鏡写真」とあるを「合の合狐粗
極り４００倍顕微鏡写真」と補正する。FIG. 1(a) shows 40% of forged steel with a forged ratio of 3 according to the present invention.
This is a 0x micrograph. FIG. 2 is a graph showing the influence of the forging ratio before soaking on the life. 1st B (F') Soaking after forging (Soaking while still casting bl
400 1200"Cx6hr8, C (arrow indicates carbideg) Word 2 Figure Training Ratio 1, Indication of incident Patent Application No. 25420 of 1988 3, Person making amendment 4, Date of amendment order 5 of 1988 Month 31st (Delivered 1) i, Correction subject to amendment i'IE Contents of +1 (1) Details; R page 6, line 5 [40048 microscope after soaking process] 400x microscope.'' (2) Detailed reading, page 6, line 7, [4004i3 microscopic photograph of Gono] has been corrected to read ``400x microscopic photograph of Gono Agitsune.''
Claims (1)
０℃の間で２時間以上の均熱処理をすることを特徴とす
る高温軸受用鋼の熱処理方法。After processing the steel ingot to a forging ratio of 2 or more, from 1150℃ to 122℃
A method for heat treating steel for high-temperature bearings, characterized by performing soaking treatment at 0°C for 2 hours or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63025420A JPH0742497B2 (en) | 1988-02-04 | 1988-02-04 | Heat treatment method for corrosion and heat resistant bearing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63025420A JPH0742497B2 (en) | 1988-02-04 | 1988-02-04 | Heat treatment method for corrosion and heat resistant bearing steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01201422A true JPH01201422A (en) | 1989-08-14 |
| JPH0742497B2 JPH0742497B2 (en) | 1995-05-10 |
Family
ID=12165458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63025420A Expired - Fee Related JPH0742497B2 (en) | 1988-02-04 | 1988-02-04 | Heat treatment method for corrosion and heat resistant bearing steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0742497B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5560787A (en) * | 1993-06-29 | 1996-10-01 | Nsk Ltd. | Rolling bearing for high-speed rotation at high temperatures |
| US11000156B2 (en) | 2016-09-02 | 2021-05-11 | Novo Futura Ivs | Disposable grill and method of manufacturing a disposable grill |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2341592T3 (en) | 2005-07-09 | 2010-06-22 | Skumtech As | CONSTRUCTION SUPPORT FOR ELEVATED CONSTRUCTIONS AND UNDERGROUND CONSTRUCTIONS. |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5031530A (en) * | 1973-07-26 | 1975-03-28 | ||
| JPS5031529A (en) * | 1973-07-26 | 1975-03-28 | ||
| JPS62250121A (en) * | 1986-04-23 | 1987-10-31 | Daido Steel Co Ltd | Manufacture of tool steel |
-
1988
- 1988-02-04 JP JP63025420A patent/JPH0742497B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5031530A (en) * | 1973-07-26 | 1975-03-28 | ||
| JPS5031529A (en) * | 1973-07-26 | 1975-03-28 | ||
| JPS62250121A (en) * | 1986-04-23 | 1987-10-31 | Daido Steel Co Ltd | Manufacture of tool steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5560787A (en) * | 1993-06-29 | 1996-10-01 | Nsk Ltd. | Rolling bearing for high-speed rotation at high temperatures |
| US11000156B2 (en) | 2016-09-02 | 2021-05-11 | Novo Futura Ivs | Disposable grill and method of manufacturing a disposable grill |
| US11805932B2 (en) | 2016-09-02 | 2023-11-07 | Novo Futura Ivs | Disposable grill and method of manufacturing a disposable grill |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0742497B2 (en) | 1995-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |