CN103628021A - Drop-feed ferrite gas nitrocarburizing technology - Google Patents
Drop-feed ferrite gas nitrocarburizing technology Download PDFInfo
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- CN103628021A CN103628021A CN201310572514.XA CN201310572514A CN103628021A CN 103628021 A CN103628021 A CN 103628021A CN 201310572514 A CN201310572514 A CN 201310572514A CN 103628021 A CN103628021 A CN 103628021A
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Abstract
The invention discloses a drop-feed ferrite gas nitrocarburizing technology. The drop-feed ferrite gas nitrocarburizing technology comprises the following steps: (1) feeding a part into a furnace, to be specific, firstly heating the temperature of the furnace to 575-590 DEG C, at the moment, feeding the part into the furnace, and when the temperature of the furnace naturally drops to 450-550 DEG C, heating to 575-590 DEG C; (2) exhausting, to be specific, exhausting in the process of heating the temperature of the furnace to 575-590 DEG C from 450-550 DEG C, dropwise adding methyl alcohol during exhausting, and simultaneously feeding ammonia gas; (3) nitrocarburizing, to be specific, after the temperature of the furnace rises to 575-590 DEG C, continuously and respectively dropwise adding methyl alcohol at the same dropwise addition speed and flow rate, feeding ammonia gas, keeping the pressure of the furnace at 1400-1600 Pa, and preserving temperature for 540-600 minutes; and (4) taking out from the furnace and carrying out oil cooling. The low-carbon alloy steel part treated by the technology is obviously superior to a low-carbon alloy steel part treated by an existing technology in the terms of the depth of a compound layer, the total depth of an infiltrated layer and the surface hardness. The porosity of the compound layer is unchanged, so that the general mechanical performance of the low-carbon alloy steel part is greatly improved.
Description
Technical field
The present invention relates to a kind of nitrogen-carbon cocementing process, especially a kind of dripping type ferrite gas nitrocarburizing technique that obtains thick compound layer, belongs to thermo-chemical treatment technical field.
Background technology
Gas nitrocarburizing is to infiltrate nitrogen and carbon on iron and steel parts top layer simultaneously, and take nitriding as main chemical heat treatment process, its objective is the comprehensive mechanical properties such as surface hardness, wear resistance and erosion resistance in order to improve iron and steel parts.The part such as weighshaft, arm shaft is the important spare part of diesel engine, in diesel engine operational process, these parts bear larger repeated stress, wear and tear more serious after long term operation, and this just requires these piece surface hardness high, wear resistance is good, solidity to corrosion is good, and fatigue strength is high, and weighshaft, arm shaft etc. all adopts low-carbon alloy steel to make, conventionally adopt the method through well formula nitriding furnace carbonitriding to improve above-mentioned comprehensive mechanical performance, after carbonitriding, carry out again polished finish.But the part such as weighshaft, arm shaft is after existing nitrogen-carbon cocementing process is processed, and its surface hardness, the compound layer degree of depth, infiltration layer total depth etc. are all difficult to meet the requirement of diesel engine operation condition.
Application number is that 201110187040.8 Chinese invention patent application discloses a kind of rare earth catalytic cementation nitrogen-carbon cocementing process, its technique is the rare-earth energizer of configuration different concns, according to workpiece technical qualification, select suitable processing parameter to carry out carbonitriding, wherein nitriding medium is ammonia, carburizing agent is methyl alcohol or acetone, carbonitriding temperature is 570 ℃, the technique of this invention makes the thickening of infiltration layer bright layer, depth of penetration increases, shortened the process time, workpiece surface hardness and diffusion layer hardness have been improved, make hardness gradient become mild, refinement diffusion layer organization, increase the dispersity of nitride, use properties and the work-ing life of workpiece have been improved, but complex technical process, cost is high, still cannot meet weighshaft, the service requirements of the low-carbon alloy steel parts such as arm shaft.
Summary of the invention
The object of this invention is to provide that a kind of technique is simple, easy to operate, cost is low, can meet the dripping type ferrite gas nitrocarburizing technique of the service requirementss of low-carbon alloy steel part such as weighshaft, arm shaft.
The present invention is achieved by the following technical programs:
A dripping type ferrite gas nitrocarburizing technique, comprises the following steps:
(1) enter stove: first furnace temperature is risen to 575～590 ℃, now part is sent in stove, treat that furnace temperature drops to 450～550 ℃ naturally, then be warming up to 575～590 ℃, open nitrogen gesture instrument simultaneously;
(2) exhaust: when furnace temperature rises to exhaust 575～590 ℃ of processes from 450～550 ℃, evacuation time is no less than 45 minutes, splashes into methyl alcohol during exhaust, passes into ammonia simultaneously, and it is 60～90 droplets/minute that methyl alcohol splashes into speed, and ammonia flow is 4.25～4.75m
3/ h, when waste gas can be lighted, closes venting hole, stops exhaust;
(3) ooze altogether: when furnace temperature rises to after 575～590 ℃, continue to splash into respectively methyl alcohol with the identical speed that splashes into and flow, and pass into ammonia, adjust venting hole simultaneously, make furnace pressure remain on 1400～1600Pa, be incubated 540～600 minutes;
(4) come out of the stove: open venting hole, make furnace pressure be down to normal pressure, the oil cooling of coming out of the stove.
Object of the present invention can also further realize by following technical measures.
Aforesaid dripping type ferrite gas nitrocarburizing technique, wherein in step (2) and step (3), ammonia dissociation rate is 55%～70%.
Technological process of the present invention is simple, easy to operate, cost is low, compared with prior art, the compound layer degree of depth of the low-carbon alloy steel part of processing through the present invention, infiltration layer total depth and surface hardness are all obviously better than the low-carbon alloy steel part that prior art was processed, and the sedimentation of compound layer does not change, and meets relevant criterion requirement, thereby the comprehensive mechanical performance that has greatly improved low-carbon alloy steel part, meets its service requirements.
Advantage and disadvantage of the present invention, the non-limitative illustration by preferred embodiment below is for illustration and explanation, and these embodiment, only provide as an example with reference to accompanying drawing.
Accompanying drawing explanation
Fig. 1 is process curve schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
It is that the diesel engine rocker shaft of 25Cr2MoV carries out nitrogen-carbon cocementing process that the present embodiment is selected material, as shown in Figure 1, comprises the following steps:
(1) enter stove: first furnace temperature is risen to 580 ℃, now part is sent in well formula nitriding furnace, treat that furnace temperature drops to 500 ℃ naturally, then be warming up to 580 ℃, open nitrogen gesture instrument simultaneously;
(2) exhaust: when furnace temperature rises to exhaust 580 ℃ of processes from 500 ℃, evacuation time is no less than 45 minutes, splashes into methyl alcohol during exhaust, passes into ammonia simultaneously, and it is 60～90 droplets/minute that methyl alcohol splashes into speed, and ammonia flow is 4.25～4.75m
3/ h, in the present embodiment, to splash into speed be 80 droplets/minute to methyl alcohol, ammonia flow is 4.25 m
3/ h, ammonia dissociation rate is 55%～70%, when waste gas can be lighted, closes venting hole, stops exhaust;
(3) ooze altogether: when furnace temperature rises to after 580 ℃, continue to splash into respectively methyl alcohol with the identical speed that splashes into and flow, and pass into ammonia, adjust venting hole simultaneously, make furnace pressure remain on 1400～1600Pa, be incubated 600 minutes;
(4) come out of the stove: open venting hole, make furnace pressure be down to normal pressure, the oil cooling of coming out of the stove.
After above-mentioned processing, diesel engine rocker shaft surface compound layer thickness is not less than 0.015mm, and infiltration layer total depth is not less than 0.3mm, surface hardness Hv
0.2720～Hv
0.2920, the present invention contrasts with prior art as following table:
| ? | Compound layer degree of depth mm | Infiltration layer total depth mm | Surface hardness/Hv 0.2 | Compound layer sedimentation |
| Prior art | 0.005～0.0075 | 0.24～0.25 | 727～735 | 1～2 grade |
| The present invention | 0.02～0.025 | 0.35～0.4 | 800～818 | 1～2 grade |
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.
Claims (2)
1. a dripping type ferrite gas nitrocarburizing technique, is characterized in that, comprises the following steps:
(1) enter stove: first furnace temperature is risen to 575～590 ℃, now part is sent in stove, treat that furnace temperature drops to 450～550 ℃ naturally, then be warming up to 575～590 ℃, open nitrogen gesture instrument simultaneously;
(2) exhaust: when furnace temperature rises to exhaust 575～590 ℃ of processes from 450～550 ℃, evacuation time is no less than 45 minutes, splashes into methyl alcohol during exhaust, passes into ammonia simultaneously, and it is 60～90 droplets/minute that methyl alcohol splashes into speed, and ammonia flow is 4.25～4.75m
3/ h, when waste gas can be lighted, closes venting hole, stops exhaust;
(3) ooze altogether: when furnace temperature rises to after 575～590 ℃, continue to splash into respectively methyl alcohol with the identical speed that splashes into and flow, and pass into ammonia, adjust venting hole simultaneously, make furnace pressure remain on 1400～1600Pa, be incubated 540～600 minutes;
(4) come out of the stove: open venting hole, make furnace pressure be down to normal pressure, the oil cooling of coming out of the stove.
2. dripping type ferrite gas nitrocarburizing technique as claimed in claim 1, is characterized in that: in step (2) and step (3), ammonia dissociation rate is 55%～70%.
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| CN201310572514.XA CN103628021A (en) | 2013-11-18 | 2013-11-18 | Drop-feed ferrite gas nitrocarburizing technology |
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| CN201310572514.XA CN103628021A (en) | 2013-11-18 | 2013-11-18 | Drop-feed ferrite gas nitrocarburizing technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105002458A (en) * | 2015-08-06 | 2015-10-28 | 潘桂枝 | Gaseous carbonitriding method of steel |
| CN111519129A (en) * | 2020-05-07 | 2020-08-11 | 徐州万达回转支承有限公司 | Rotation-driven surface soft nitriding chemical heat treatment strengthening method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101435065A (en) * | 2007-11-15 | 2009-05-20 | 冯俊杰 | Low temperature rare earth catalytic cementation soft nitriding processing technology for high speed steel mould |
-
2013
- 2013-11-18 CN CN201310572514.XA patent/CN103628021A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101435065A (en) * | 2007-11-15 | 2009-05-20 | 冯俊杰 | Low temperature rare earth catalytic cementation soft nitriding processing technology for high speed steel mould |
Non-Patent Citations (3)
| Title |
|---|
| R·迦太基·菲舍等: "《渗氮和氮碳共渗》", 30 November 1989, article "2.1.3.3 氮碳共渗", pages: 81-86 * |
| 陈涛等: "加压气体渗氮和氮碳共渗研究", 《金属热处理》, no. 3, 25 March 1998 (1998-03-25), pages 5 - 8 * |
| 黄守伦: "《实用化学热处理与表面强化新技术》", 30 June 2002, article "第三节 气体氮碳共渗", pages: 93-102 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105002458A (en) * | 2015-08-06 | 2015-10-28 | 潘桂枝 | Gaseous carbonitriding method of steel |
| CN111519129A (en) * | 2020-05-07 | 2020-08-11 | 徐州万达回转支承有限公司 | Rotation-driven surface soft nitriding chemical heat treatment strengthening method |
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Application publication date: 20140312 |