WO2003050321A1 - Procede de carbonitruration sous vide - Google Patents
Procede de carbonitruration sous vide Download PDFInfo
- Publication number
- WO2003050321A1 WO2003050321A1 PCT/JP2001/010954 JP0110954W WO03050321A1 WO 2003050321 A1 WO2003050321 A1 WO 2003050321A1 JP 0110954 W JP0110954 W JP 0110954W WO 03050321 A1 WO03050321 A1 WO 03050321A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vacuum
- furnace
- carburizing
- gas
- nitriding
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/34—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in more than one step
Definitions
- the present invention relates to a vacuum carbonitriding method performed under reduced pressure.
- ethylene gas is used as a carburizing gas, and the pressure inside the vacuum heat treatment furnace is reduced to 1 to 10 kPa.
- a known method is known (see Japanese Patent Application Laid-Open No. Hei 11-131 363).
- Low-grade steels such as steels with a high content of impurities such as MnS, low-alloy steels, and low-carbon steels, are not hardened by quenching by rapid cooling after carburization, and have sufficient surface hardness and effective hardened layer depth. There is a problem that can not be obtained. Also, in this method, in order to obtain a surface hardened layer with low-grade steel, if ammonia gas is simultaneously introduced into the vacuum heat treatment furnace in addition to ethylene gas and hydrogen gas, the residual austenite increases and cement Evening is likely to precipitate.
- the present invention has been made in order to solve the above-mentioned problems, and reduces the required heat treatment quality such as surface hardness, effective hardened layer depth, toughness, etc., even in a workpiece made of low grade steel or case hardened steel. It is an object of the present invention to provide a vacuum carbonitriding method which can be obtained with good reproducibility in time. Disclosure of the invention
- the article to be treated is heated to a predetermined carburizing temperature in a reduced-pressure vacuum heat treatment furnace, and then a carburizing gas is supplied into the furnace to perform a vacuum carburizing treatment. While the supply of carburizing gas is stopped, carbon is diffused in the workpiece under reduced pressure, then the furnace temperature is lowered, and then nitriding gas is supplied into the reduced pressure furnace to perform nitriding treatment. Is performed.
- the vacuum carbonitriding method of claim 1 it is possible to prevent the amount of retained austenite in the surface layer from becoming excessive and to increase the surface hardness, even in the case of a workpiece made of low-grade steel,
- the effective hardened layer depth can be increased in a relatively short time.
- the effective hardened layer depth can be easily controlled, and the effective hardened The layer depth can be obtained with good reproducibility.
- the amount of cementite deposited on the surface layer can be reduced, and the toughness can be improved to prevent the occurrence of cracks.
- a vacuum carbonitriding method is the method according to the first aspect, wherein a mixed gas of ethylene gas and hydrogen gas is used as the carburizing gas.
- the vacuum carbonitriding method according to claim 3 is the method according to claim 1 or 2, wherein the effective hardened layer depth of the workpiece after quenching performed after nitriding is controlled based on the nitriding time. It is. In this case, by changing the nitriding time, effective hardened layers having various depths can be obtained with good reproducibility.
- FIG. 1 is a diagram showing a processing pattern of the vacuum carbonitriding method according to the present invention.
- FIG. 2 is a conceptual diagram showing the carbon concentration and the nitrogen concentration in the surface layer of the article to be treated which has been subjected to the vacuum carbonitriding by the method according to the present invention.
- FIG. 3 is a vertical cross-sectional view showing a processed product used in Examples 1 to 3 and Comparative Example.
- FIG. 4 is a graph showing a hardness distribution of a surface layer portion of a workpiece to which a vacuum carbonitriding process is performed according to the first embodiment.
- FIG. 5 is a graph showing a hardness distribution of a surface layer portion of a workpiece to which a vacuum carbonitriding process is performed according to the second embodiment.
- FIG. 1 is a diagram showing a processing pattern of the vacuum carbonitriding method according to the present invention.
- FIG. 2 is a conceptual diagram showing the carbon concentration and the nitrogen concentration in the surface layer of the article to be treated which has been subject
- FIG. 6 is a graph showing a hardness distribution of a surface layer portion of an article to be treated which has been subjected to vacuum carbonitriding according to the third embodiment.
- FIG. 7 is a graph showing the hardness distribution of the surface layer portion of the workpiece subjected to the vacuum carbonitriding according to the comparative example.
- FIG. 8 is a graph showing the relationship between the nitriding time and the effective hardened layer depth in Examples 1 to 3.
- FIG. 1 shows a processing pattern of the vacuum carbonitriding method according to the present invention.
- vacuum carbonitriding is performed as follows. That is, after placing the workpiece in the vacuum heat treatment furnace, the inside of the furnace is depressurized by the vacuum exhaust device. Next, after heating the inside of the furnace to a predetermined carburizing temperature and performing a pre-heat treatment, carburizing is performed while supplying a carburizing gas, for example, a mixed gas of ethylene gas and hydrogen gas, into the furnace. Then, supply of ethylene gas and hydrogen gas is stopped, and diffusion treatment is performed at a diffusion temperature equal to the carburizing temperature.
- a carburizing gas for example, a mixed gas of ethylene gas and hydrogen gas
- nitriding is performed while supplying a nitriding gas, for example, ammonia gas, and finally oil quenching is performed.
- a nitriding gas for example, ammonia gas
- the carburizing temperature is 870 to 150 ° C, for example, 930 to 950, and the nitriding temperature is 780 to 900: lower than the carburizing temperature.
- the preheating time varies depending on the carburizing temperature and the shape of the article to be treated, but is preferably 35 to 40 minutes.
- the carburizing time, diffusion time and nitriding time vary depending on the depth of the effective hardened layer to be obtained.
- the rate of cooling from the carburizing temperature to the nitriding temperature varies depending on the weight (load weight) of the articles to be treated at one time. Further, it is preferable that the furnace pressure during carburization is 3 to 9 kPa, and the furnace pressure during nitriding is 3 to 9 kPa.
- a cup end (1) for a push port made of JIS SWCH 10R and having the shape shown in Fig. 3 was used.
- the inner diameter d of the recess (2) is 4.5 mm.
- a plurality of cup ends (1) are loaded on the bottom of the two-tiered basket with the opening of the recess (2) facing downward, and a plurality of dies are loaded on the top of the two-tiered basket.
- the two-tiered basket was placed in an effective heating space where the temperature uniformity in the vacuum heat treatment furnace was guaranteed.
- the total weight of the force pend (1) is 17.5 kg, and the total weight of the cap pend, dummy, basket and tray is 75.5 kg.
- nitriding treatment was carried out at 850 for 180 minutes under a pressure of 2 to 4 kPa while supplying ammonia gas into the furnace.
- a quenching oil of Daphne Quench HV (manufactured by Idemitsu Co., Ltd.) at an oil temperature of 60 and oil-cooled for 20 minutes.
- the oil surface pressure was 10 kPa, and the quenched oil was stirred by rotating an oil stirrer at 450 rpm.
- tempering treatment was performed at 150 at 90 minutes. Thus, vacuum carbonitriding was performed on the cup end (1).
- Example 3 Except that the nitriding time was set to 120 minutes, a vacuum carbonitriding treatment was applied to the coupling (1) in the same manner as in Example 1 above.
- Example 3 Except that the nitriding time was set to 120 minutes, a vacuum carbonitriding treatment was applied to the coupling (1) in the same manner as in Example 1 above.
- Example 3
- the cup end (1) was loaded in a basket together with the dummy in the same manner as in Example 1 above.
- the effective heating space in the furnace is heated to 850 in 10 minutes and held at this temperature for 40 minutes. Heat treatment was applied.
- carbonitriding was performed by maintaining ethylene gas, hydrogen gas, and ammonia gas at a pressure of 4 to 5 kPa and maintaining the pressure at 850 for 160 minutes.
- the flow rate of ethylene gas was controlled at 10 liters Z
- the flow rate of hydrogen gas was controlled at 5 liters Z
- the flow rate of ammonia gas was controlled at 10 liters Z.
- the hardness of the deepest part P (see Fig. 3) of the bottom surface in the concave part (2) of each of the vacuum carbonitrided power end parts (1) of Examples 1 to 3 and the comparative example was measured by JIS GO 577 Measured by the prescribed method.
- Examples 1 and 2 0.1 mm! From the outermost surface of the deepest part P described above. The hardness distribution at a depth of ⁇ 1.5 mm was determined.
- Example 3 the hardness distribution at a depth of 0.1 mm to 1.0 mm from the outermost surface of the deepest portion P was determined. Further, in the comparative example, the distance from the outermost surface of the deepest portion P was 0. 1 mn! The hardness distribution at a depth of ⁇ 1.2 mm was determined.
- FIG. 4 shows the results of Example 1
- FIG. 5 shows the results of Example 2
- FIG. 6 shows the results of Example 3
- FIG. 7 shows the results of the comparative example.
- Example 1 the hardness at a depth of 0.1 mm from the outermost surface of the deepest portion P is Hv 744, and the effective hardened layer has a hardness of Hv 550. The depth is 0.55 mm.
- Example 2 the hardness at the depth of 0.1 mm from the outermost surface of the deepest portion P is Hv770, and the effective hardening has a hardness of Hv550.
- the layer depth is 0.44 mm.
- the hardness at a depth of 1 mm is Hv 740, and the effective hardened layer depth having a hardness of Hv 550 is 0.31 mm.
- the relationship between the nitriding time and the effective hardened layer depth in Examples 1 to 3 is shown in FIG. As is clear from Fig. 8, the effective hardened layer depth is proportional to the nitriding time.
- the hardness at a depth of 0.1 mm from the outermost surface of the deepest portion P is Hv 730, and the effective hardening has a hardness of Hv 550.
- the layer depth is 0.22 mm.
- the vacuum carbonitriding method according to the present invention is useful for performing carbonitriding of low-grade steel and case-hardened steel. It is suitable for obtaining necessary heat treatment quality such as effective hardened layer depth and toughness in a short time and with good reproducibility.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60141304T DE60141304D1 (de) | 2001-12-13 | 2001-12-13 | Vakuum-carbonitrierverfahren |
AU2002221138A AU2002221138A1 (en) | 2001-12-13 | 2001-12-13 | Vacuum carbo-nitriding method |
US10/485,827 US7112248B2 (en) | 2001-12-13 | 2001-12-13 | Vacuum carbo-nitriding method |
EP01274938A EP1454998B1 (en) | 2001-12-13 | 2001-12-13 | Vacuum carbo-nitriding method |
CNB018236820A CN1263887C (zh) | 2001-12-13 | 2001-12-13 | 真空碳氮共渗方法 |
PCT/JP2001/010954 WO2003050321A1 (fr) | 2001-12-13 | 2001-12-13 | Procede de carbonitruration sous vide |
JP2003551339A JP3931276B2 (ja) | 2001-12-13 | 2001-12-13 | 真空浸炭窒化方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2001/010954 WO2003050321A1 (fr) | 2001-12-13 | 2001-12-13 | Procede de carbonitruration sous vide |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003050321A1 true WO2003050321A1 (fr) | 2003-06-19 |
Family
ID=11738033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/010954 WO2003050321A1 (fr) | 2001-12-13 | 2001-12-13 | Procede de carbonitruration sous vide |
Country Status (7)
Country | Link |
---|---|
US (1) | US7112248B2 (ja) |
EP (1) | EP1454998B1 (ja) |
JP (1) | JP3931276B2 (ja) |
CN (1) | CN1263887C (ja) |
AU (1) | AU2002221138A1 (ja) |
DE (1) | DE60141304D1 (ja) |
WO (1) | WO2003050321A1 (ja) |
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EP1247875A2 (de) * | 2001-04-04 | 2002-10-09 | Aichelin Industrieofenbau Ges.m.b.H. | Verfahren und Vorrichtung zur Niederdruck-Carbonitrierung von Stahlteilen |
JP2006028541A (ja) * | 2004-07-12 | 2006-02-02 | Nissan Motor Co Ltd | 高強度機械構造用部品の製造方法、および高強度機械構造用部品 |
JP2006322036A (ja) * | 2005-05-18 | 2006-11-30 | Kobe Steel Ltd | 真空浸炭処理部品およびその製法 |
JP2008179882A (ja) * | 2006-12-27 | 2008-08-07 | General Electric Co <Ge> | ニッケル基超合金を安定化させるための浸炭プロセス |
JP2010222636A (ja) * | 2009-03-23 | 2010-10-07 | Aisin Seiki Co Ltd | 鋼材の表面処理方法 |
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US9212416B2 (en) | 2009-08-07 | 2015-12-15 | Swagelok Company | Low temperature carburization under soft vacuum |
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FR2884523B1 (fr) * | 2005-04-19 | 2008-01-11 | Const Mecaniques Sa Et | Procede et four de carbonitruration a basse pression |
US8758527B2 (en) * | 2006-12-15 | 2014-06-24 | Sikorsky Aircraft Corporation | Gear material for an enhanced rotorcraft drive system |
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FR3029938B1 (fr) | 2014-12-11 | 2019-04-26 | Ecm Technologies | Procede et four de carbonitruration a basse pression |
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WO2020092299A1 (en) * | 2018-10-30 | 2020-05-07 | West Virginia University | Methods and compositions for direct, simultaneous conversion of nitrogen and natural gas to value-added compounds |
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- 2001-12-13 EP EP01274938A patent/EP1454998B1/en not_active Expired - Lifetime
- 2001-12-13 DE DE60141304T patent/DE60141304D1/de not_active Expired - Lifetime
- 2001-12-13 WO PCT/JP2001/010954 patent/WO2003050321A1/ja active Application Filing
- 2001-12-13 CN CNB018236820A patent/CN1263887C/zh not_active Expired - Lifetime
- 2001-12-13 US US10/485,827 patent/US7112248B2/en not_active Expired - Lifetime
- 2001-12-13 AU AU2002221138A patent/AU2002221138A1/en not_active Abandoned
- 2001-12-13 JP JP2003551339A patent/JP3931276B2/ja not_active Expired - Fee Related
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Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1247875A3 (de) * | 2001-04-04 | 2004-09-01 | Aichelin Industrieofenbau Ges.m.b.H. | Verfahren und Vorrichtung zur Niederdruck-Carbonitrierung von Stahlteilen |
EP1247875A2 (de) * | 2001-04-04 | 2002-10-09 | Aichelin Industrieofenbau Ges.m.b.H. | Verfahren und Vorrichtung zur Niederdruck-Carbonitrierung von Stahlteilen |
JP4655528B2 (ja) * | 2004-07-12 | 2011-03-23 | 日産自動車株式会社 | 高強度機械構造用部品の製造方法、および高強度機械構造用部品 |
JP2006028541A (ja) * | 2004-07-12 | 2006-02-02 | Nissan Motor Co Ltd | 高強度機械構造用部品の製造方法、および高強度機械構造用部品 |
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JP2019014931A (ja) * | 2017-07-05 | 2019-01-31 | 日産自動車株式会社 | 鋼材部品の熱処理方法 |
Also Published As
Publication number | Publication date |
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AU2002221138A1 (en) | 2003-06-23 |
EP1454998B1 (en) | 2010-02-10 |
CN1558961A (zh) | 2004-12-29 |
US7112248B2 (en) | 2006-09-26 |
JP3931276B2 (ja) | 2007-06-13 |
DE60141304D1 (de) | 2010-03-25 |
JPWO2003050321A1 (ja) | 2005-04-21 |
EP1454998A1 (en) | 2004-09-08 |
EP1454998A4 (en) | 2007-07-04 |
US20040250921A1 (en) | 2004-12-16 |
CN1263887C (zh) | 2006-07-12 |
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