EP2773787A1 - Procede de carbonitruration basse pression, a gradient reduit de temperature dans une phase de nitruration initiale - Google Patents
Procede de carbonitruration basse pression, a gradient reduit de temperature dans une phase de nitruration initialeInfo
- Publication number
- EP2773787A1 EP2773787A1 EP12769125.1A EP12769125A EP2773787A1 EP 2773787 A1 EP2773787 A1 EP 2773787A1 EP 12769125 A EP12769125 A EP 12769125A EP 2773787 A1 EP2773787 A1 EP 2773787A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- phase
- nitriding
- pressure carbonitriding
- low pressure
- 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
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
- C23C8/32—Carbo-nitriding of ferrous surfaces
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- 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
- C23C8/02—Pretreatment of the material to be coated
-
- 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
-
- 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
- C23C8/80—After-treatment
Definitions
- the present invention relates to a low-pressure carbonitriding process for steel parts, including, but not limited to, parts used in the manufacture of motor vehicles.
- the invention also applies to parts used in the manufacture of agricultural machinery, machine tool, or parts in the aeronautical field.
- Document EP 1885904 discloses a process for the low-pressure carbonitriding of steel parts comprising alternating stages of carburizing and nitriding at a constant temperature, preceded by a step of raising the temperature and of a temperature equalization step, followed by a quenching step. Alternatively it is proposed to inject a nitriding gas during the temperature rise step and / or during the temperature equalization step, from a temperature of 800 ° C.
- the object of the invention is to improve the process of the aforementioned document, that is to say to improve the quality of the parts obtained, preferably with a reduction of the treatment time.
- a low pressure carbonitriding process of steel parts comprising alternating steps of carburizing and nitriding at a constant temperature, preceded by a temperature rise step comprising a single temperature rise phase followed by an initial nitriding phase with continued rise in temperature, and followed by a quenching step, wherein during the initial nitriding phase the temperature rise is performed with a reduced temperature gradient compared to the simple temperature rise phase.
- the parts are maintained longer in a temperature range favorable to good nitriding.
- the initial nitriding phase comprises a temperature step.
- the initial nitriding phase is carried out under optimal temperature conditions, so that it is possible to shorten or eliminate one of the nitriding steps subsequent to the carburizing temperature, and thus reduce the total treatment time.
- the initial nitriding phase is immediately followed by a first step of cementation.
- the total elimination of the temperature equalization phase makes it possible to lengthen the initial nitriding phase in an optimum temperature range for nitriding.
- the process comprises a final nitriding step accompanied by a lowering of temperature immediately before the quenching.
- the final nitriding step comprises a temperature step.
- the final nitriding step is also carried out in an optimum temperature range, so that the quality of the treatment is improved.
- the method according to the invention comprises a first step of temperature rise comprising a first simple temperature rise phase M, illustrated by a line in continuous line, from the ambient temperature up to a point at a temperature of 700 ° C, denoted Ni 1 in the figure.
- the simple temperature rise phase can be carried out up to a temperature of between 700 ° C. and 750 ° C., and has a duration of between 10 minutes and 90 minutes. that is to say that the simple temperature rise is carried out with a temperature gradient of between 8 ° C./min and 75 ° C./min.
- the method then comprises an initial nitriding phase Ni with continuation of the temperature rise step up to a temperature of 940 ° C in the illustrated example.
- the temperature of 940 ° C corresponds to a compromise between a temperature of 860 ° C which allows a treatment of better quality and a temperature of 1000 ° C which allows for faster processing.
- the rise in temperature is continued regularly but with a temperature gradient of between 3.5 ° C / min and 16 ° C / min less than the temperature gradient during the simple temperature rise.
- the duration of the initial nitriding phase is between 15 minutes and 45 minutes, depending on the amount of nitrogen that it is desired to set in this initial step and the composition of the steel to be treated.
- the initial nitriding phase comprises injection phases of a nitriding gas such as alternating ammonia with diffusion phases.
- the rise in temperature continues with the same temperature gradient as during the simple rise in temperature to a point at a temperature comprised between between 750 ° C. and 850 ° C., here 800 ° C., denoted Ni 2 in FIG. 2.
- the temperature is then maintained according to a plateau until a moment noted Ni 3 in FIG. 2 from which a strong rise in temperature is achieved. to reach the carburizing temperature.
- the temperature of the bearing is chosen in a manner known per se to perform the initial nitriding phase under optimal conditions given the composition of the parts to be treated. Note in this connection that because of the bearing, the final temperature rise can be carried out very rapidly, for example 80 ° C / min at 100 ° C / min without subjecting the parts to unacceptable constraints.
- the rise in temperature continues from the point Ni 1 with a lower temperature gradient than in the first mode. embodiment, preferably in a range of 2 ° C / min to 8 ° C / min, up to a moment noted Ni4, here corresponding to a temperature of 850 ° C, from which a high temperature rise is achieved to reach the carburising temperature, according to a gradient similar to that of the second embodiment.
- the method then comprises n alternating carburizing phases with nitriding phases.
- the carburizing and nitriding steps comprise alternating treatment gas injection phases with diffusion phases not shown in the figures.
- the diagram has been interrupted between the nitriding step N1 and the last cementation step Cn.
- the method comprises a final nitriding step Nn accompanied by a temperature drop immediately before the T quenching.
- the temperature is lowered continuously to a temperature within the optimum temperature range. for nitriding while remaining high enough to allow efficient quenching.
- the final temperature before quenching is 840 ° C.
- satisfactory results are obtained for a final temperature before quenching between 900 ° C. and 800 ° C. It has been found that this limited descent of temperature decreases the stress on the parts during quenching.
- the final nitriding step has a duration of preferably between 15 minutes and 60 minutes, which corresponds to a temperature gradient of between 10 ° C / min and 1 ° C / min.
- the final nitriding step preferably comprises alternating nitriding gas injection phases with diffusion phases.
- the descent of temperature is first of all carried out in a strong manner, with a gradient as strong as possible without causing undue stresses in the steel, up to the optimum nitriding temperature for the steel being treated, noted Nn1 in the figure, here 840 ° C, and then the temperature is maintained at a plateau until the beginning of quenching.
- the method according to the invention can be implemented by combining any of the embodiments of the initial nitriding phase with any of the embodiments of the final nitriding phase, or even terminate the treatment cycle in a conventional manner, ie with a quench performed directly from the carburising temperature.
- the temperature of the workpieces has time to equalize so that it is possible to eliminate the equalization step provided in the aforementioned document. If this is necessary, for example because of a particular configuration of the parts to be treated, it may however provide a temperature equalization step of reduced duration between the initial nitriding phase and the first cementation step.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1159877A FR2981948B1 (fr) | 2011-10-31 | 2011-10-31 | Procede de carbonitruration basse pression, a gradient reduit de temperature dans une phase de nitruration initiale |
| PCT/EP2012/069889 WO2013064336A1 (fr) | 2011-10-31 | 2012-10-08 | Procede de carbonitruration basse pression, a gradient reduit de temperature dans une phase de nitruration initiale |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2773787A1 true EP2773787A1 (fr) | 2014-09-10 |
| EP2773787B1 EP2773787B1 (fr) | 2018-07-04 |
Family
ID=46980985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12769125.1A Active EP2773787B1 (fr) | 2011-10-31 | 2012-10-08 | Procede de carbonitruration basse pression, a gradient reduit de temperature dans une phase de nitruration initiale |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US9708704B2 (fr) |
| EP (1) | EP2773787B1 (fr) |
| JP (1) | JP6189850B2 (fr) |
| KR (1) | KR101945004B1 (fr) |
| CN (1) | CN103946412B (fr) |
| BR (1) | BR112014010315A2 (fr) |
| FR (1) | FR2981948B1 (fr) |
| IN (1) | IN2014CN03952A (fr) |
| MX (1) | MX360731B (fr) |
| WO (1) | WO2013064336A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119824362A (zh) * | 2025-01-08 | 2025-04-15 | 武汉理工大学 | 一种高碳铬轴承多重异构组织极端性能成形制造方法 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1159877A (fr) | 1956-10-17 | 1958-07-03 | Boucle de sangle réglable à ouverture rapide | |
| JPH02294461A (ja) * | 1989-05-09 | 1990-12-05 | Mazda Motor Corp | 鋼部材の浸炭処理方法 |
| KR930007148B1 (ko) | 1990-03-27 | 1993-07-30 | 마쓰다 가부시끼가이샤 | 열 처리장치 |
| FR2777911B1 (fr) * | 1998-04-28 | 2000-07-28 | Aubert & Duval Sa | Procede de carbonitruration a basse pression de pieces en alliage metallique |
| JP3960697B2 (ja) * | 1998-12-10 | 2007-08-15 | 株式会社日本テクノ | 浸炭および浸炭窒化処理方法 |
| WO2003050321A1 (fr) | 2001-12-13 | 2003-06-19 | Koyo Thermo Systems Co., Ltd. | Procede de carbonitruration sous vide |
| PL204747B1 (pl) * | 2002-10-31 | 2010-02-26 | Politechnika & Lstrok Odzka | Sposób nawęglania wyrobów stalowych w podciśnieniu |
| JP2006002194A (ja) * | 2004-06-16 | 2006-01-05 | Nsk Ltd | 軸の製造方法 |
| 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 |
| FR2884523B1 (fr) * | 2005-04-19 | 2008-01-11 | Const Mecaniques Sa Et | Procede et four de carbonitruration a basse pression |
| JP5295813B2 (ja) * | 2009-02-17 | 2013-09-18 | Dowaサーモテック株式会社 | 鉄族系合金の窒化処理方法 |
| DE102009002985A1 (de) * | 2009-05-11 | 2010-11-18 | Robert Bosch Gmbh | Verfahren zur Carbonitrierung |
| CN101851735B (zh) * | 2010-04-19 | 2011-09-07 | 东风汽车有限公司 | 一种球墨铸铁的强化工艺及其制成品 |
| DE102010028165A1 (de) * | 2010-04-23 | 2011-10-27 | Robert Bosch Gmbh | Verfahren zur Carbonitrierung von metallischen Bauteilen |
-
2011
- 2011-10-31 FR FR1159877A patent/FR2981948B1/fr not_active Expired - Fee Related
-
2012
- 2012-10-08 CN CN201280053990.4A patent/CN103946412B/zh active Active
- 2012-10-08 MX MX2014005220A patent/MX360731B/es active IP Right Grant
- 2012-10-08 IN IN3952CHN2014 patent/IN2014CN03952A/en unknown
- 2012-10-08 EP EP12769125.1A patent/EP2773787B1/fr active Active
- 2012-10-08 US US14/354,358 patent/US9708704B2/en active Active
- 2012-10-08 BR BR112014010315A patent/BR112014010315A2/pt active Search and Examination
- 2012-10-08 WO PCT/EP2012/069889 patent/WO2013064336A1/fr not_active Ceased
- 2012-10-08 KR KR1020147015025A patent/KR101945004B1/ko active Active
- 2012-10-08 JP JP2014539274A patent/JP6189850B2/ja active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013064336A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6189850B2 (ja) | 2017-08-30 |
| MX2014005220A (es) | 2015-03-05 |
| BR112014010315A2 (pt) | 2017-05-02 |
| CN103946412B (zh) | 2016-10-05 |
| JP2014532809A (ja) | 2014-12-08 |
| FR2981948B1 (fr) | 2014-01-03 |
| CN103946412A (zh) | 2014-07-23 |
| WO2013064336A1 (fr) | 2013-05-10 |
| EP2773787B1 (fr) | 2018-07-04 |
| KR101945004B1 (ko) | 2019-02-01 |
| KR20140101749A (ko) | 2014-08-20 |
| US9708704B2 (en) | 2017-07-18 |
| FR2981948A1 (fr) | 2013-05-03 |
| IN2014CN03952A (fr) | 2015-10-23 |
| MX360731B (es) | 2018-11-14 |
| US20150101710A1 (en) | 2015-04-16 |
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