CN1626697A - Technical method for controlling non-martensite - Google Patents
Technical method for controlling non-martensite Download PDFInfo
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- CN1626697A CN1626697A CN 200310109318 CN200310109318A CN1626697A CN 1626697 A CN1626697 A CN 1626697A CN 200310109318 CN200310109318 CN 200310109318 CN 200310109318 A CN200310109318 A CN 200310109318A CN 1626697 A CN1626697 A CN 1626697A
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- methyl alcohol
- nitrogen
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- atmosphere
- martensite
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Abstract
A technology for preventing the generation of martensite in workpiece includes such steps as putting workpieces on supporting frame, removing rust, oil and others from their surface, discharging gas from furnace, heating the furnace, loading workpieces in furnace, carbonizing, introducing ammonia gas to furnace for 15-60 min, and quenching.
Description
(1) technical field
The present invention relates to a kind of metal heat treating methods, relate in particular to a kind of process control method that in final thermal treatment, reduces the metallic surface non-martensite microstructure.
(2) background technology
Non-martensite microstructure is carburizing and a kind of common deficiency of carbonitriding part diffusion layer organization, according to domestic and international pertinent data report, serious non-horse tissue can significantly reduce hardness, contact fatigue strength and the bending fatigue strength of gear surface and cause the gear premature wear, thereby has a strong impact on the work-ing life of gear.The factor that produces non-martensite microstructure is a lot, and alloying element, quenchant, equipment and atmosphere, piece surface rugosity or the like are arranged, but can not control effectively to carburizing and quenching surface non-martensite microstructure in the art at present.
(3) summary of the invention
The effective ways that the purpose of this invention is to provide non-martensite microstructure control in a kind of carburizing quenching process.
For reaching above-mentioned purpose, the process control method of non-martensite of the present invention comprises following operation:
(1) shelves, and remove the rust staining of workpiece;
(2) clean, remove described workpiece oil stain, surface attachments;
(3) press the preexhaust in hot stove of the listed parameter of unstripped gas table look-up;
(4) described workpiece is placed in the described hot stove;
(5) described workpiece is carried out carburizing;
(6) described workpiece is quenched;
Be characterized in, set up following operation between described (5) procedure and (6) procedure:
Logical 15 to 60 minutes ammonia in described hot stove;
The unstripped gas table look-up
| Unstripped gas | Acetone | Methyl alcohol | Ammonia | Propane | Nitrogen |
| Purity | ≥99.5％ | ≥98.8％ | It is dry earlier to enter the stokehold | ?≥99.5％ | ≥99.9％ |
| Flow | Constant 0.8～1L/h increment 1.6～2.5L/h | 3.5～5L/h | 0.1～0.6m 3/h | ?0.2～0.6m 3/h | 3～6m 3/h |
| Remarks | Be used for directly giving birth to the formula carburizing atmosphere | Be used for nitrogen, methyl alcohol atmosphere | The periodic replacement siccative | Be used for nitrogen, methyl alcohol atmosphere | Be used for nitrogen, methyl alcohol atmosphere |
In the last table, L represents " liter ", and m represents " rice ", h represent " hour ".
Adopt above-mentioned process control method, can make the top layer of workpiece infiltrate a small amount of activated nitrogen atom, thereby the hardening capacity that increases the top layer of workpiece is to reduce non-martensite microstructure.
For further specifying above-mentioned purpose of the present invention, process characteristic and effect, below will be described in detail the present invention.
(4) embodiment
Below will the technical scheme and the enforcement of the process control method of non-martensite of the present invention be described in detail.
The carburizing and quenching workpiece advances stove and arrives cemented zone through exhaust area, because the relation of rate of heating and surrounding atmosphere, before arriving cemented zone, workpiece surface easily forms oxide film, and this kind grain boundary oxidation is one of major reason that causes non-martensite microstructure, i.e. H in the atmosphere
2O and CO
2The Sauerstoffatom that is decomposed to form is after outermost layer forms oxide compound, and then along the crystal boundary diffusion, intragranular alloying element is to the oxygen diffusion of crystal boundary, and at this formation oxide compound, the matrix alloy element reduces near causing oxide compound, thereby hardening capacity reduces, and easily forms non-martensite microstructure.Therefore, the process control method of non-martensite of the present invention, its operation is as follows:
(1) shelves, and remove the rust staining of workpiece;
(2) clean, remove workpiece oil stain, surface attachments;
(3) preexhaust in the hot stove, the listed parameter preexhaust in stove of unstripped gas table look-up of pressing table one, attention keeps the ridity and the flow of unstripped gas purity, ammonia;
(4) hot stove advances workpiece;
(5) above-mentioned workpiece is carried out carburizing;
(6) logical 15 to 60 minutes ammonia in hot stove notices that the ridity and the flow of ammonia, this operation can make the top layer of workpiece infiltrate a small amount of activated nitrogen atom, thereby the hardening capacity that increases the top layer of workpiece is to reduce non-martensite microstructure;
(7) above-mentioned workpiece is quenched.
Table one (unstripped gas table look-up)
| Unstripped gas | Acetone | Methyl alcohol | Ammonia | Propane | Nitrogen |
| Purity | ≥99.5％ | ≥98.8％ | It is dry earlier to enter the stokehold | ≥99.5％ | ≥99.9％ |
| Flow | Constant 0.8～1L/h increment 1.6～2.5L/h | 3.5～5L/h | 0.1～0.6m 3/h | 0.2～0.6m 3/h | 3～6m 3/h |
| Remarks | Be used for directly giving birth to the formula carburizing atmosphere | Be used for nitrogen, methyl alcohol atmosphere | The periodic replacement siccative | Be used for nitrogen, methyl alcohol atmosphere | Be used for nitrogen, methyl alcohol atmosphere |
In the above-mentioned table one, L represents " liter ", and m represents " rice ", h represent " hour ".
The present invention has than obvious effects the control of carburizing and quenching non-martensite microstructure, and especially Xin Zeng (6) procedure is the distinguishing feature of process control method of the present invention.
Table two, table three are to adopt the present invention front and back carburizing and quenching non-martensite microstructure degree of depth synopsis (through 5 experiments)
Adopt the preceding table two of the present invention
| Carburizing direct quenching | Heating quenching of carburizing | |||||||||
| ????1 | ????2 | ????3 | ????4 | ????5 | ????1 | ????2 | ????3 | ????4 | ????5 | |
| Non-martensite average dark (mm) | ????????????????????????????0.016 | ?????????????????????????0.018 | ||||||||
Table three behind employing the present invention
| Carburizing direct quenching | Heating quenching of carburizing | |||||||||
| ????1 | ????2 | ????3 | ????4 | ????5 | ????1 | ????2 | ????3 | ????4 | ????5 | |
| Non-martensite average dark (mm) | ??????????????????????????0.01 | ??????????????????????????0.013 | ||||||||
By the contrast of table two and table three as can be seen, adopt the non-martensite behind the present invention average dark preceding lower, so the process control method of non-martensite of the present invention can control effectively to the surperficial non-martensite microstructure of carburizing and quenching than invention.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, under the situation that does not break away from spirit of the present invention, also can make the variation and the modification of various equivalences, therefore, as long as variation, the modification to the foregoing description all will drop in the scope of claims of the present invention in connotation scope of the present invention.
Claims (1)
1. the process control method of a non-martensite comprises following operation:
(1) shelves, and remove the rust staining of workpiece;
(2) clean, remove described workpiece oil stain, surface attachments;
(3) press the preexhaust in hot stove of the listed parameter of unstripped gas table look-up;
(4) described workpiece is placed in the described hot stove;
(5) described workpiece is carried out carburizing;
(6) described workpiece is quenched;
It is characterized in that, set up following operation between described (5) procedure and (6) procedure:
Logical 15 to 60 minutes ammonia in described hot stove;
The unstripped gas table look-up
Unstripped gas Acetone Methyl alcohol Ammonia Propane Nitrogen
Purity ≥99.5％ ≥98.8％ It is dry earlier to enter the stokehold ≥99.5％ ≥99.9％
Flow Constant 0.8～1L/h increment 1.6～2.5L/h 3.5～5L/h 0.1～0.6m
3/h
0.2～0.6m
3/h
3～6m
3/h
Remarks Be used for directly giving birth to the formula carburizing atmosphere Be used for nitrogen, methyl alcohol atmosphere The periodic replacement siccative Be used for nitrogen, methyl alcohol atmosphere Be used for nitrogen, methyl alcohol atmosphere
In the last table, L represents " liter ", and m represents " rice ", h represent " hour ".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310109318 CN1626697A (en) | 2003-12-12 | 2003-12-12 | Technical method for controlling non-martensite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310109318 CN1626697A (en) | 2003-12-12 | 2003-12-12 | Technical method for controlling non-martensite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1626697A true CN1626697A (en) | 2005-06-15 |
Family
ID=34758940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310109318 Pending CN1626697A (en) | 2003-12-12 | 2003-12-12 | Technical method for controlling non-martensite |
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| CN (1) | CN1626697A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101842502B (en) * | 2007-10-31 | 2012-10-03 | 罗伯特·博世有限公司 | Drive belt ring component and manufacturing method therefor |
| CN106637060A (en) * | 2016-10-20 | 2017-05-10 | 洛阳Lyc轴承有限公司 | Carbonitriding heat treatment technique under new atmosphere |
-
2003
- 2003-12-12 CN CN 200310109318 patent/CN1626697A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101842502B (en) * | 2007-10-31 | 2012-10-03 | 罗伯特·博世有限公司 | Drive belt ring component and manufacturing method therefor |
| CN106637060A (en) * | 2016-10-20 | 2017-05-10 | 洛阳Lyc轴承有限公司 | Carbonitriding heat treatment technique under new atmosphere |
| CN106637060B (en) * | 2016-10-20 | 2019-02-05 | 洛阳Lyc轴承有限公司 | A kind of carbo-nitriding heat-treatment technology method |
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