JP2009127114A5 - - Google Patents
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- JP2009127114A5 JP2009127114A5 JP2007306168A JP2007306168A JP2009127114A5 JP 2009127114 A5 JP2009127114 A5 JP 2009127114A5 JP 2007306168 A JP2007306168 A JP 2007306168A JP 2007306168 A JP2007306168 A JP 2007306168A JP 2009127114 A5 JP2009127114 A5 JP 2009127114A5
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- nitrogen
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- grain boundary
- layer portion
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Description
図１２を参照して、本発明の実施例Ａのサンプルにおける表層部には、粒界析出物（アスペクト比２以上で、かつ７．５μｍ以上の長さで形成された鉄の窒化物）は観察されず、良好なミクロ組織となっている。また、図１３および図１４を参照して、実施例Ａのサンプルの表面から深さ０．０５ｍｍ以内の領域は、９５０ＨＶ以上という十分な硬度を有しているとともに、十分な量の窒素が侵入している。そのため、実施例Ａと同様の熱処理を実施した鋼部材の表面に対して研磨などの仕上げ加工を施すことにより、窒素濃度が０．０５質量％以上、炭素濃度と窒素濃度との合計値が０．５５質量％以上１．９質量％以下、厚み０．１１ｍｍ以上、硬度８００ＨＶ以上の窒素富化層が形成されるとともに、当該窒素富化層を顕微鏡にて観察した場合、粒界析出物が一辺１５０μｍの正方形領域５視野内に１個以下である機械部品を製造することができる。 Referring to FIG. 12, in the surface layer portion of the sample of Example A of the present invention, grain boundary precipitates (iron nitride formed with an aspect ratio of 2 or more and a length of 7.5 μm or more) It is not observed and has a good microstructure. Referring to FIGS. 13 and 14, the region within a depth of 0.05 mm from the surface of the sample of Example A has a sufficient hardness of 950 HV or more, and a sufficient amount of nitrogen is present. Invaded. Therefore, by applying a finishing process such as polishing to the surface of the steel member subjected to the same heat treatment as in Example A, the nitrogen concentration is 0.05 mass% or more, and the total value of the carbon concentration and the nitrogen concentration is 0. When a nitrogen-enriched layer having a thickness of 0.11 mm or more and a hardness of 800 HV or more is formed and the nitrogen-enriched layer is observed with a microscope, grain boundary precipitates are One or less machine parts can be manufactured within 5 fields of view of a square area of 150 μm per side.
一方、図１５を参照して、本発明の範囲外である比較例Ａのサンプルにおける表層部には、多数の粒界析出物９０が観察される。また、図１６および図１７を参照して、比較例Ａのサンプルの表面から深さ０．０５ｍｍ以内の領域は、実施例Ａと同様に、９５０ＨＶ以上という十分な硬度を有しているとともに、十分な量の窒素が侵入している。そのため、比較例Ａと同様の熱処理を実施した鋼部材の表面に対して研磨などの仕上げ加工を施しても、高硬度な表層部が形成されているものの、表層部に粒界析出物が残存する機械部品が得られる。このような機械部品は、上述のように、十分な疲労強度や靭性を有しているとはいえない。 On the other hand, with reference to FIG. 15, many grain boundary precipitates 90 are observed in the surface layer portion of the sample of Comparative Example A that is outside the scope of the present invention. In addition, referring to FIGS. 16 and 17, the region within a depth of 0.05 mm from the surface of the sample of Comparative Example A has a sufficient hardness of 950 HV or more as in Example A. A sufficient amount of nitrogen has penetrated. Therefore, even when a finishing process such as polishing is performed on the surface of a steel member that has been subjected to the same heat treatment as in Comparative Example A, a high-hardness surface layer portion is formed, but grain boundary precipitates remain in the surface layer portion. Machine parts to be obtained. Such mechanical parts cannot be said to have sufficient fatigue strength and toughness as described above.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007306168A JP5397928B2 (en) | 2007-11-27 | 2007-11-27 | Machine parts |
| US12/744,665 US8337089B2 (en) | 2007-11-27 | 2008-11-21 | Mechanical component and rolling bearing |
| CN200880118689.0A CN101874125B (en) | 2007-11-27 | 2008-11-21 | Machine component and rolling bearing |
| CN201110288989.7A CN102586697B (en) | 2007-11-27 | 2008-11-21 | Component of machine and rolling bearing |
| EP11180165.0A EP2397567B1 (en) | 2007-11-27 | 2008-11-21 | Machine component and rolling bearing |
| PCT/JP2008/071218 WO2009069547A1 (en) | 2007-11-27 | 2008-11-21 | Machine component and rolling bearing |
| EP08855002.5A EP2226405B1 (en) | 2007-11-27 | 2008-11-21 | Machine component and rolling bearing |
| US13/238,889 US8453528B2 (en) | 2007-11-27 | 2011-09-21 | Mechanical component and rolling bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007306168A JP5397928B2 (en) | 2007-11-27 | 2007-11-27 | Machine parts |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2009127114A JP2009127114A (en) | 2009-06-11 |
| JP2009127114A5 true JP2009127114A5 (en) | 2010-12-16 |
| JP5397928B2 JP5397928B2 (en) | 2014-01-22 |
Family
ID=40818346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007306168A Active JP5397928B2 (en) | 2007-11-27 | 2007-11-27 | Machine parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5397928B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5489111B2 (en) * | 2009-03-25 | 2014-05-14 | Ｎｔｎ株式会社 | Bearing parts, rolling bearings and bearing parts manufacturing method |
| DE102012205242A1 (en) * | 2012-03-30 | 2013-10-02 | Schaeffler Technologies AG & Co. KG | rolling bearing component |
| WO2015128973A1 (en) * | 2014-02-26 | 2015-09-03 | 日本精工株式会社 | Anti-friction bearing |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001336538A (en) * | 2000-05-26 | 2001-12-07 | Nsk Ltd | Rolling bearing and its method of manufacture |
| JP2006038167A (en) * | 2004-07-29 | 2006-02-09 | Nsk Ltd | Roller bearing |
| JP2007120712A (en) * | 2005-10-31 | 2007-05-17 | Ntn Corp | Double row automatic aligning roller bearing for aircraft |
-
2007
- 2007-11-27 JP JP2007306168A patent/JP5397928B2/en active Active
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